CN116904816A - High-thermal-stability aluminum lithium alloy and preparation method thereof - Google Patents
High-thermal-stability aluminum lithium alloy and preparation method thereof Download PDFInfo
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- 229910001148 Al-Li alloy Inorganic materials 0.000 title claims abstract description 52
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000001989 lithium alloy Substances 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 36
- 238000010438 heat treatment Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 20
- 238000004321 preservation Methods 0.000 claims description 20
- 238000005096 rolling process Methods 0.000 claims description 20
- 229910052786 argon Inorganic materials 0.000 claims description 18
- 238000005242 forging Methods 0.000 claims description 18
- 238000003723 Smelting Methods 0.000 claims description 17
- 238000005266 casting Methods 0.000 claims description 16
- 238000010791 quenching Methods 0.000 claims description 16
- 230000000171 quenching effect Effects 0.000 claims description 16
- 230000032683 aging Effects 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 11
- 238000007670 refining Methods 0.000 claims description 10
- 239000006104 solid solution Substances 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 239000000956 alloy Substances 0.000 abstract description 25
- 229910045601 alloy Inorganic materials 0.000 abstract description 24
- 229910052709 silver Inorganic materials 0.000 abstract description 10
- 229910052802 copper Inorganic materials 0.000 abstract description 9
- 229910052706 scandium Inorganic materials 0.000 abstract description 9
- 229910052744 lithium Inorganic materials 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 8
- 229910000838 Al alloy Inorganic materials 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 11
- OPHUWKNKFYBPDR-UHFFFAOYSA-N copper lithium Chemical compound [Li].[Cu] OPHUWKNKFYBPDR-UHFFFAOYSA-N 0.000 description 7
- 239000012535 impurity Substances 0.000 description 6
- 238000005728 strengthening Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 229910019015 Mg-Ag Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 229910018569 Al—Zn—Mg—Cu Inorganic materials 0.000 description 2
- 229910017706 MgZn Inorganic materials 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/12—Alloys based on aluminium with copper as the next major constituent
- C22C21/16—Alloys based on aluminium with copper as the next major constituent with magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/057—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with copper as the next major constituent
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The application provides an aluminum lithium alloy, which comprises the following chemical components: 3.5 to 5.5 percent of Cu,0.5 to 2.0 percent of Li,0.4 to 1.2 percent of Mg,0.08 to 0.2 percent of Zr,0.3 to 0.8 percent of Ag,0.1 to 0.3 percent of Sc and the balance of Al; and the Cu/Mg ratio of the main alloy is more than 5. The application also provides a preparation method of the aluminum-lithium alloy. According to the aluminum lithium alloy provided by the application, the high Cu/Mg ratio is taken as the main alloy, and the content of alloy elements of Ag and Sc is introduced and optimized, so that the aluminum lithium alloy has better thermal stability and mechanical property. Experimental results show that the aluminum-lithium alloy provided by the application can meet the requirements of tensile strength of more than 530MPa, yield strength of more than 450MPa and elongation of more than 5% after 180 ℃/15 h.
Description
Technical Field
The application relates to the technical field of resume alloy, in particular to an aluminum-lithium alloy with high thermal stability and a preparation method thereof.
Background
The 7XXX high-strength aluminum alloy represented by 7050 is used as a lightweight structural material in a large amount for load bearing structural parts such as rockets and missiles, but the aluminum alloy is generally not resistant to high temperature, and is generally used by winding fibers or adding a heat insulating coating to a member which needs to be contacted with a high-temperature heat source. Thus, in the fiber or coating curing process, the aluminum alloy part is required to undergo a long high temperature exposure process, typically 160 ℃ per 15 hours, resulting in some degradation of the aluminum alloy properties.
Along with the improvement of the curing process, the curing temperature needs to be increased to 180 ℃, so the corresponding application unit in the aerospace field provides an aluminum alloy material requirement capable of resisting higher temperature, and after 180 ℃/15h, the tensile strength is greater than 530MPa, the yield strength is greater than 450MPa, and the elongation is greater than 5%.
In existing aluminum alloy systems, prior to heat exposure, the system capable of meeting the strength requirement is only Al-Zn-Mg-Cu alloy represented by 7050 and 7055 and 2195 2050 is a typical Al-Cu-Li-Mg-Ag alloy. However, the Al-Zn-Mg-Cu alloy has MgZn as the main strengthening phase 2 The strength performance can be drastically reduced after long-time heat preservation at 180 ℃, and the requirements can not be met; the main strengthening phase of the existing Al-Cu-Li-Mg-Ag alloy is Al 2 The temperature of CuLi is kept for a long time at 180 ℃, the precipitated phase coarsens, the strength and the plasticity are reduced, and the requirement cannot be met.
The Chinese patent with publication number CN115927935A discloses an Al-Cu-Mg-Ag-Si-Sc high heat resistance aluminum alloy and a preparation method thereof, and the main performances are as follows: the room temperature tensile strength is 424MPa, the yield strength is 404MPa, the tensile strength is 405MPa after heat exposure at 210 ℃/100h, and the yield strength is 367MPa. The alloy formula has better heat stability, but the body strength is lower before heat exposure and cannot meet the requirement.
The publication No. CN109666812A discloses a high-heat-stability ultrahigh-strength aluminum alloy and a preparation method thereof, wherein the main method is that Co with the concentration of 1% is added into a 7XXX aluminum alloy, and after the developed alloy is insulated for 108 hours at 150 ℃, the tensile strength is 698MPa, and the yield strength is 672MPa; the patent does not mention the properties after 15 hours of heat preservation at 180 ℃, but the main strengthening phase of the alloy is still MgZn 2 The performance is remarkably reduced under the long-time heat preservation at 160 ℃, so that the alloy cannot meet the requirement of the long-time heat preservation at 180 ℃.
In the prior art disclosed above, there is no material and preparation method that can meet the requirements.
Disclosure of Invention
The technical problem solved by the application is to provide the aluminum-lithium alloy, which has better high thermal stability and mechanical property.
In view of this, the present application provides a high thermal stability aluminum lithium alloy comprising:
and Cu/Mg > 5.
Preferably, the Cu content is 3.6 to 5.4wt%.
Preferably, the content of Li is 0.8 to 1.8wt%.
Preferably, the Mg content is 0.5 to 1.0wt%.
Preferably, the Zr content is 0.12 to 0.18wt%.
Preferably, the Ag content is 0.35-0.65 wt%.
Preferably, the content of Sc is 0.12 to 0.25wt%.
The application also provides a preparation method of the high-heat-stability aluminum lithium alloy, which comprises the following steps:
proportioning and mixing raw materials according to the component ratio of the aluminum-lithium alloy, and smelting the mixed raw materials to obtain aluminum liquid;
casting the molten aluminum, and homogenizing to obtain an initial ingot;
and forging the initial ingot, rolling, and sequentially carrying out solution quenching, bulging and aging treatment to obtain the aluminum-lithium alloy.
Preferably, the smelting is performed under the protection of argon, and no refining agent is adopted; the casting is performed under argon protection.
Preferably, the homogenizing temperature is 450-510 ℃, and the heat preservation time is 20-40 h; heating is further included before forging, the heating temperature is 440-500 ℃, and the temperature is kept for 10-25 h; heating is further included before rolling, the heating temperature is 440-500 ℃, the temperature is kept for 5-20 h, and the rolling speed is 3-10 mm/s; the solid solution temperature is 500-550 ℃, the heat preservation is carried out for 2-6 hours, and the quenching medium is water; the deformation of the bulging is 3-5%; the aging temperature is 120-180 ℃, and the heat preservation is carried out for 12-40 h.
The application provides an aluminum lithium alloy, which comprises the following components: 3.5 to 5.5 percent of Cu,0.5 to 2.0 percent of Li,0.4 to 1.2 percent of Mg,0.08 to 0.2 percent of Zr,0.3 to 0.8 percent of Ag,0.1 to 0.3 percent of Sc and the balance of Al, and Cu/Mg is more than 5; the aluminum-lithium alloy provided by the application takes high Cu/Mg ratio as main alloy to improve main strengthening phase Al 2 The content of CuLi optimizes the content of trace element Ag to promote Al 2 The precipitation density of CuLi is reduced by adding Sc element 2 The coarsening rate of the CuLi is favorable for the aluminum-lithium alloy to have high thermal stability and excellent mechanical properties through the optimized design of the components.
Furthermore, the aluminum-lithium alloy provided by the application is matched with corresponding casting, plastic deformation and heat treatment, so that the obtained aluminum-lithium alloy has high heat stability and high mechanical property; experimental results show that after 180 ℃/15h, the tensile strength of the aluminum-lithium alloy is greater than 530MPa, the yield strength is greater than 450MPa, and the elongation is greater than 5%.
Detailed Description
For a further understanding of the present application, preferred embodiments of the application are described below in conjunction with the examples, but it should be understood that these descriptions are merely intended to illustrate further features and advantages of the application, and are not limiting of the claims of the application.
Aiming at the performance requirement of high strength and high thermal stability of part of bearing components in the aerospace field, the application provides an aluminum-lithium alloy which is based on the existing high-strength Al-Cu-Li-Mg-Ag system, and the aluminum-lithium alloy has better thermal stability and mechanical property simultaneously by taking high Cu/Mg ratio as main alloy and introducing and optimizing the content of alloy elements of Ag and Sc; further matching with corresponding casting, plastic deformation and heat treatment processes, an aluminum-lithium alloy material with tensile strength of more than 530MPa, yield strength of more than 450MPa and elongation of more than 5 percent is developed after 180 ℃/15 h. Specifically, the application firstly provides a high-heat-stability aluminum lithium alloy, which comprises the following components:
and Cu/Mg > 5.
In the aluminum lithium alloy provided by the application, the content of Cu is 3.5-5.5 wt%, specifically, the content of Cu is 3.6-5.4 wt%, and more specifically, the content of Cu is 4.0-5.0 wt%. The content of Mg is 0.4-1.2 wt%, and specifically, the content of Mg is 0.5-1.0 wt%. In the present application, it is further defined that the mass ratio of Cu/Mg is > 5, specifically, cu/Mg is 5.2 to 8.5. The application uses high Cu/Mg ratio as main alloy to improve main strengthening phase Al 2 And the content of CuLi to improve the strength of the aluminum-lithium alloy.
Li is used as a main source element of the strengthening phase, and is beneficial to improving the performance of the aluminum-lithium alloy. The content of Li is 0.5 to 2.0wt%, specifically, the content of Li is 0.8 to 1.8wt%, more specifically, the content of Li is 1.0 to 1.7wt%.
Zr can form nano-scale metastable Al 3 Zr phase, inhibit recrystallization and improve the tensile strength of the aluminum lithium alloy. The Zr content is 0.08-0.2 wt%, specifically, the Zr content is 0.12-0.18 wt%.
Ag to promote Al 2 The deposition density of CuLi, the content of Ag is 0.3-0.8 wt%, and specifically, the content of Ag is 0.35-0.65 wt%.
Sc for reducing Al 2 The coarsening rate of CuLi, the content of Sc is 0.1 to 0.3wt%, specifically, the content of Sc is 0.12 to 0.3wt%, and more specifically, the content of Sc is 0.15 to 0.25wt%.
The application also provides a preparation method of the aluminum-lithium alloy, which comprises the following steps:
proportioning and mixing raw materials according to the component ratio of the aluminum-lithium alloy, and smelting the mixed raw materials to obtain aluminum liquid;
casting the molten aluminum, and homogenizing to obtain an initial ingot;
and forging the initial ingot, rolling, and sequentially carrying out solution quenching, bulging and aging treatment to obtain the aluminum-lithium alloy.
Taking an annular part as an example, the preparation process of the aluminum-lithium alloy comprises the following steps of: smelting, casting, homogenizing, forging, ring rolling, solution quenching, bulging and aging.
According to the application, the raw materials are proportioned according to the composition of the target aluminum-lithium alloy, and in order to avoid introducing impurities, aluminum ingots, intermediate alloys and pure metals are used as raw materials. The raw materials are put into a smelting furnace for smelting, and the smelting is carried out under the protection of argon; the method comprises the following steps:
argon is introduced into the smelting furnace, and when the oxygen content in the smelting furnace is less than 200ppm, heating is started to raise the temperature; after the alloy is melted, when the temperature reaches 740-750 ℃, degassing and refining are started, wherein argon is adopted In refining, the argon flow is 50-70 In/min, the argon pressure is 4.0-7.0 barg, the rotating speed of a rotor is 700-820 rpm, and a refining agent is not adopted In the refining process.
In the smelting process, specifically, the flow rate of the argon is 55-65 In/min, the pressure of the argon is 5.0-6.5 barg, and the rotating speed of the rotor is 740-800 rpm.
The application then casts the molten aluminum obtained by smelting, preferably in argon, in particular:
introducing argon into the launder and the crystallizer, introducing degassed high-purity molten aluminum into the crystallizer through the launder for semi-continuous direct-cooling casting when the oxygen content in the launder and the crystallizer is less than 200ppm, and starting a wiper in the casting process to avoid ingot cracking caused by overlarge cooling strength.
According to the application, after the ingot is obtained, the ingot is homogenized, wherein the homogenizing temperature is 450-510 ℃, the heat preservation time is 20-40 h, and specifically, the homogenizing temperature is 490-505 ℃, and the heat preservation time is 22-35 h.
The method comprises the steps of forging a homogenized cast ingot, wherein the cast ingot is heated before forging, the heating temperature is 440-500 ℃, the heat preservation is carried out for 10-25 h, specifically, the heating temperature is 440-480 ℃, and the heat preservation is carried out for 15-20 h; forging is performed after heating, and the forging can be performed according to the model requirement of a product, for example, the forging comprises forging cogging and punching; the specific manner of operation of the forging described above is a manner well known to those skilled in the art, and the present application is not particularly limited thereto.
According to the product requirement, the forged ring blank after punching is subjected to ring rolling, and the ring is preferably heated before ring rolling, wherein the heating temperature is 440-500 ℃, the heat preservation is 5-20 h, and specifically, the heating temperature is 440-480 ℃, and the heat preservation is 8-15 h; the speed of ring rolling is 3-10 mm/s, and specifically, the speed of ring rolling is 4-8 mm/s.
After the ring rolling, the ring piece is subjected to solid solution quenching, wherein the solid solution temperature is 500-550 ℃, the heat preservation is carried out for 2-6 hours, the quenching medium is water, the water temperature is 15-30 ℃, and the quenching transfer time is not more than 15s; specifically, the solid solution temperature is 510-530 ℃, and the temperature is kept for 3-5 hours.
The application then expands the ring part, the deformation is controlled to be 3-5%, and the transfer time from solution quenching to expansion is controlled to be within 4 hours. Aging is carried out after bulging, wherein the aging temperature is 120-180 ℃, the heat preservation is carried out for 12-40 h, and specifically, the aging temperature is 140-160 ℃ and the heat preservation is carried out for 20-30 h. The time between said bulging and said ageing is not more than 4 hours.
The application provides an aluminum lithium alloy, which comprises the following chemical components: 3.5 to 5.5 percent of Cu,0.5 to 2.0 percent of Li,0.4 to 1.2 percent of Mg,0.08 to 0.2 percent of Zr,0.3 to 0.8 percent of Ag,0.1 to 0.3 percent of Sc and the balance of Al; and the Cu/Mg ratio of the main alloy is more than 5; smelting, casting, homogenizing, forging, ring rolling, bulging and heat treatment processes matched with the chemical components are carried out, and finally the aluminum-lithium alloy with both heat stability and mechanical properties is prepared; experimental results show that after 180 ℃/15h, the performance index of the aluminum-lithium alloy provided by the application can meet the requirements of tensile strength of more than 530MPa, yield strength of more than 450MPa and elongation of more than 5%, and the existing alloy brand used in maturity cannot completely meet the index. In addition, the preparation method of the alloy adopts the existing aluminum-lithium alloy casting equipment and conventional forging, ring rolling, bulging and heat treatment equipment for production, does not need to add new complicated procedures, and is suitable for batch production.
In order to further understand the present application, the high heat stability aluminum lithium alloy and the preparation method thereof provided by the present application are described in detail with reference to the following examples, and the scope of the present application is not limited by the following examples.
Example 1
The high-heat stability high-strength aluminum lithium alloy has the specification of phi 1800/phi 1650 mm 200mm, and comprises the following steps:
step 1: the aluminum alloy comprises the following chemical components in percentage by mass: 4% Cu,1.1% Li,0.5% Mg,0.12% Zr,0.35% Ag,0.18% Sc, the balance Al and impurities; weighing aluminum ingots, intermediate alloys and pure metals as raw materials according to the components of the target alloy, and putting the raw materials into a smelting furnace; argon is introduced into the smelting furnace, and when the oxygen content in the smelting furnace is less than 200ppm, heating is started to raise the temperature; after the alloy is melted, when the temperature reaches 745 ℃, degassing and refining are started, wherein argon is adopted In refining, the argon flow is 70In/min, the argon pressure is 5.5barg, the rotating speed of a rotor is 740rpm, and a refining agent is not adopted In the refining process;
step 2: argon is introduced into the launder and the crystallizer, and when the launder isIntroducing the degassed high-purity aluminum liquid into the crystallizer through a runner to perform semi-continuous direct-cooling casting when the oxygen content in the crystallizer is less than 200ppm, starting a wiper in the casting process, wherein the casting speed is 30mm/min, and the water flow is 65m 3 And (h) after casting is completed, closing cooling water, and tempering;
step 3: transferring the cast ingot to a soaking pit for homogenizing, wherein the homogenizing system is 500 ℃, preserving the heat for 28 hours, and naturally cooling and detecting after homogenizing;
step 4: heating a phi 500 x 710mm cast ingot to 450 ℃, preserving heat for 20 hours, transferring to a forging press for forging, firstly performing 4 upsetting 3 drawing process cogging, forging to phi 840 x 250mm, and then punching by adopting a punch of phi 365;
step 5: heating the punched ring blank to 450 ℃, preserving heat for 10 hours, transferring to a ring rolling mill, carrying out ring rolling, controlling the rolling speed to be 4mm/s, and rolling the ring piece to phi 1765/phi 1580 mm;
step 6: after ring rolling is completed, carrying out solid solution quenching on the ring piece, wherein the solid solution degree is 510 ℃, the temperature is kept for 4 hours, quenching is carried out immediately after the solid solution is completed, the quenching medium is water, the water temperature is controlled at 15-30 ℃, and the quenching transfer time is not more than 15s;
step 7: transferring the ring-shaped piece subjected to solution quenching to a bulging machine for bulging, controlling the deformation to be 3-5%, controlling the transfer time from solution quenching to bulging to be within 4 hours, and bulging to phi 1820/phi 1630 mm;
step 8: aging is carried out after bulging is completed, the aging system is 150 ℃, heat preservation is carried out for 20 hours, and the time from bulging to aging is not longer than 4 hours.
Example 2
The other procedures are the same as those of the first example, and the difference is that the aluminum alloy comprises the following chemical components in percentage by mass: 4.7% Cu,1.3% Li,0.9% Mg,0.12% Zr,0.35% Ag,0.18% Sc, the balance Al and impurities.
Example 3
The other procedures are the same as those of the first example, and the difference is that the aluminum alloy comprises the following chemical components in percentage by mass: 4% Cu,1.1% Li,0.5% Mg,0.12% Zr,0.55% Ag,0.22% Sc, the balance being Al and impurities.
Comparative example 1
The other procedures are the same as those of the first example, except that Sc is not added, the component range is the same as that of the existing 2195, and the mass percentages of the chemical components of the aluminum alloy are as follows: 4% Cu,1.1% Li,0.5% Mg,0.12% Zr,0.35% Ag, the balance being Al and impurities.
Comparative example 2
The other procedures are the same as those of the first example, and the difference is that Cu/Mg is controlled to be less than 5, and the aluminum alloy comprises the following chemical components in percentage by mass: 3% Cu,1.1% Li,1% Mg,0.12% Zr,0.35% Ag,0.18% Sc, the balance being Al and impurities.
The following table shows the comparison of the performance data of the different examples and comparative examples, and the comparison of the performance data of the different examples and comparative examples after 180 ℃/15h heat exposure.
Table 1 table of performance data for aluminum lithium alloy rings prepared in examples and comparative examples
| Tensile strength MPa | Yield strength MPa | Elongation percentage% | |
| Example 1 | 592 | 523 | 11.2 |
| Example 2 | 613 | 543 | 10.1 |
| Example 3 | 601 | 528 | 8.8 |
| Comparative example 1 | 571 | 513 | 9.7 |
| Comparative example 2 | 549 | 507 | 6.2 |
Table 2 table of performance data of aluminum lithium alloys prepared in examples and comparative examples after 180 ℃/15h heat exposure
| Tensile strength MPa | Yield strength MPa | Elongation percentage% | |
| Example 1 | 552 | 472 | 9.5 |
| Example 2 | 566 | 493 | 8.2 |
| Example 3 | 552 | 483 | 7.6 |
| Comparative example 1 | 505 | 458 | 6.5 |
| Comparative example 2 | 496 | 439 | 4.5 |
As can be seen from tables 1 and 2, the above examples and comparative examples can satisfy the requirements of tensile strength of greater than 530MPa, yield strength of greater than 450MPa, and elongation of greater than 5% before heat exposure; and after 180 ℃/15h of heat exposure, only the aluminum lithium alloy ring prepared in the example can meet the performance requirements, wherein the strength performance of the aluminum lithium alloy ring prepared in the example 2 is optimal.
The above description of the embodiments is only for aiding in the understanding of the method of the present application and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the application can be made without departing from the principles of the application and these modifications and adaptations are intended to be within the scope of the application as defined in the following claims.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A high thermal stability aluminum lithium alloy comprising:
and Cu/Mg > 5.
2. The high thermal stability aluminum lithium alloy according to claim 1, wherein the Cu content is 3.6 to 5.4wt%.
3. The high thermal stability aluminum lithium alloy according to claim 1, wherein the content of Li is 0.8 to 1.8wt%.
4. The high thermal stability aluminum lithium alloy according to claim 1, wherein the Mg content is 0.5 to 1.0wt%.
5. The high thermal stability aluminum lithium alloy according to claim 1, wherein the Zr content is 0.12 to 0.18wt%.
6. The high thermal stability aluminum lithium alloy according to claim 1, wherein the content of Ag is 0.35 to 0.65wt%.
7. The high thermal stability aluminum lithium alloy according to claim 1, wherein the Sc content is 0.12-0.25 wt%.
8. The method for preparing the high-thermal-stability aluminum lithium alloy according to claim 1, comprising the following steps:
proportioning and mixing raw materials according to the component ratio of the aluminum-lithium alloy, and smelting the mixed raw materials to obtain aluminum liquid;
casting the molten aluminum, and homogenizing to obtain an initial ingot;
and forging the initial ingot, rolling, and sequentially carrying out solution quenching, bulging and aging treatment to obtain the aluminum-lithium alloy.
9. The method of claim 8, wherein the smelting is performed under argon shield and without refining agent; the casting is performed under argon protection.
10. The preparation method according to claim 8, wherein the homogenizing temperature is 450-510 ℃ and the heat preservation time is 20-40 h; heating is further included before forging, the heating temperature is 440-500 ℃, and the temperature is kept for 10-25 h; heating is further included before rolling, the heating temperature is 440-500 ℃, the temperature is kept for 5-20 h, and the rolling speed is 3-10 mm/s; the solid solution temperature is 500-550 ℃, the heat preservation is carried out for 2-6 hours, and the quenching medium is water; the deformation of the bulging is 3-5%; the aging temperature is 120-180 ℃, and the heat preservation is carried out for 12-40 h.
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| CN120362382A (en) * | 2025-06-23 | 2025-07-25 | 湖南中创空天新材料股份有限公司 | A method for preparing a high-uniformity aluminum-lithium alloy ring and an aluminum-lithium alloy ring |
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| CN120362382A (en) * | 2025-06-23 | 2025-07-25 | 湖南中创空天新材料股份有限公司 | A method for preparing a high-uniformity aluminum-lithium alloy ring and an aluminum-lithium alloy ring |
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