CN118726775A - A kind of alloy with adjustable expansion coefficient and preparation method thereof - Google Patents
A kind of alloy with adjustable expansion coefficient and preparation method thereof Download PDFInfo
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- CN118726775A CN118726775A CN202410723128.4A CN202410723128A CN118726775A CN 118726775 A CN118726775 A CN 118726775A CN 202410723128 A CN202410723128 A CN 202410723128A CN 118726775 A CN118726775 A CN 118726775A
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
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- 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
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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Abstract
本发明涉及合金材料技术领域，具体涉及一种膨胀系数可调合金及其制备方法，包括：按照合金的原子百分比，进行原料配制；将配好的原料放入电弧熔炼炉进行反复熔炼，获得第一材料；将第一材料热轧成板材，再进行固溶处理，获得第二材料；对第二材料进行冷轧工艺处理，获得第三材料；对第三材料进行热机械循环训练，获得合金。本发明通过对所制备的合金热机械循环训练，实现了可调控的可逆负热膨胀系数以及超大负热膨胀系数；热机械循环训练中通过控制温度、压力等关键参数，使得合金在微观结构上发生了变化，从而获得了优异的负热膨胀性能。对材料的负热膨胀系数进行调控，满足不同应用场景的需求。
The present invention relates to the technical field of alloy materials, and specifically to an alloy with adjustable expansion coefficient and a preparation method thereof, comprising: preparing raw materials according to the atomic percentage of the alloy; placing the prepared raw materials into an arc melting furnace for repeated smelting to obtain a first material; hot-rolling the first material into a plate, and then performing a solid solution treatment to obtain a second material; performing a cold rolling process on the second material to obtain a third material; and performing thermomechanical cycle training on the third material to obtain an alloy. The present invention achieves an adjustable reversible negative thermal expansion coefficient and an ultra-large negative thermal expansion coefficient by thermomechanical cycle training of the prepared alloy; by controlling key parameters such as temperature and pressure during the thermomechanical cycle training, the alloy undergoes changes in its microstructure, thereby obtaining excellent negative thermal expansion performance. The negative thermal expansion coefficient of the material is regulated to meet the needs of different application scenarios.
Description
Technical Field
The invention relates to the technical field of alloy materials, in particular to alloy with an adjustable expansion coefficient and a preparation method thereof.
Background
The thermal expansion phenomenon refers to the phenomenon that the volume or length of a material is correspondingly changed in the process of temperature change, and is an inherent property of the material. Most materials expand when heated and contract when cooled, i.e. expansion and contraction are understood by us. There are few materials that can achieve "cold expansion and thermal shrinkage". The negative thermal expansion material or the zero expansion material can effectively relieve the problems of failure and the like caused by positive thermal expansion in the use process of the material, and with the improvement of technical progress and manufacturing level, the temperature stability requirement of instruments and meters is higher, and the requirements of lower expansion coefficient and even negative expansion coefficient are put forward for the material.
However, most of these negative thermal expansion materials are currently nonmetallic compounds, and have large flexibility, large brittleness and poor processability. And these nonmetallic materials, although having negative expansion effect, do not have alloy characteristics, and cannot meet the requirement of strength support. Compared with inorganic and organic negative thermal expansion materials, the metal negative thermal expansion material has good processability, heat conduction performance (strong thermal shock resistance) and mechanical property, and has wider application prospect.
Disclosure of Invention
Object of the invention
The invention aims to provide an expansion coefficient adjustable alloy capable of increasing the negative thermal expansion coefficient of an alloy and a preparation method thereof.
(II) technical scheme
In order to solve the problems, the invention provides a preparation method of an alloy with adjustable expansion coefficient, which comprises the following steps:
step 100: preparing raw materials according to the atomic percentage of the alloy;
step 200: putting the prepared raw materials into an arc melting furnace for repeated melting to obtain a first material;
step 300: the first material is hot rolled into a plate, and then solution treatment is carried out to obtain a second material;
step 400: performing cold rolling process treatment on the second material to obtain a third material;
Step 500: and carrying out thermo-mechanical cycle training on the third material to obtain the alloy.
In another aspect of the present invention, preferably, the alloy in step 100 includes titanium and niobium, and the atomic percentages of titanium and niobium in the alloy satisfy: titanium: niobium=3:1.
In another aspect of the present invention, preferably, the step 200: putting the prepared raw materials into an arc melting furnace for repeated melting to obtain a first material, wherein the method comprises the following steps of:
Placing the prepared raw materials into an arc melting furnace, and extracting vacuum to a preset vacuum degree, wherein the preset vacuum degree is less than or equal to 4.5 multiplied by 10 -3 Pa;
argon is filled to a preset pressure, wherein the preset pressure is 0.4X10 5Pa～0.6×105 Pa;
Repeatedly smelting, wherein the smelting temperature is as follows: 2500-2900 ℃; the smelting times are more than or equal to 5 times.
In another aspect of the present invention, preferably, the step 300: the first material is hot rolled into a plate, and then solution treatment is carried out to obtain a second material, wherein the second material comprises;
The hot rolling temperature of the first material is 800-900 ℃;
packaging the hot-rolled first material in a quartz tube for solution treatment;
The vacuum degree in the encapsulated quartz tube is less than or equal to 1 multiplied by 10 -4 Pa, the temperature of the solution treatment is 1100 ℃, and the solution treatment time is more than or equal to 24 hours.
In another aspect of the present invention, preferably, the step 400: and performing cold rolling process treatment on the second material to obtain a third material, wherein the cold rolling process treatment comprises the following steps:
the deformation of the cold rolling process is 90%;
Cutting the second material subjected to the cold rolling process into a dog bone shape to obtain a third material.
In another aspect of the present invention, preferably, the step 500: performing thermo-mechanical cycling training on the third material to obtain an alloy, comprising:
heating the third material to a preset temperature under a preset training load;
stretching the third material by applying an axial force in the rolling direction in a heated state;
Cooling the third material in a stretched state;
after the temperature is reduced to room temperature, unloading the axial force;
Repeating the step 500 to the preset training times to obtain the alloy.
In another aspect of the present invention, preferably, when the preset training loads are 300MPa and 450MPa, the preset temperatures are 50 ℃, 100 ℃, 150 ℃ and the preset training times are 5 times and 10 times, respectively, the prepared alloy has a reversible negative thermal expansion coefficient of-10.1x10 -6K-1～-40.6×10-6K-1 in a temperature range of-40 ℃ to 60 ℃.
In another aspect of the present invention, preferably, when the preset training load is 300MPa, 450MPa, the preset temperature is 50 ℃, 100 ℃, 150 ℃ and the preset training times are 5 times and 10 times respectively, the prepared alloy has an adjustable negative thermal expansion coefficient of-87×10 -6K-1～-216.2×10-6K-1 in a temperature range of 125 ℃ to 225 ℃.
In another aspect of the invention, preferably, a coefficient of expansion adjustable alloy is prepared using the preparation method described above.
In another aspect of the invention, preferably, the alloy has a reversible negative thermal expansion coefficient of-10.1X10 -6K-1～-40.6×10-6K-1 in the temperature range of-40℃to 60 ℃; the alloy has an adjustable negative thermal expansion coefficient of-87 x 10 -6K-1～-216.2×10-6K-1 in the temperature range of 125 ℃ to 225 ℃.
(III) beneficial effects
The technical scheme of the invention has the following beneficial technical effects:
The invention realizes controllable reversible negative thermal expansion coefficient and super-large negative thermal expansion coefficient through thermal mechanical cycle training of the prepared alloy; in the thermo-mechanical cycle training, the alloy is changed in microstructure by controlling key parameters such as temperature, pressure and the like, so that excellent negative thermal expansion performance is obtained. According to the invention, the negative thermal expansion coefficient of the material is regulated and controlled by adjusting the thermal mechanical cycle training parameters, so that the requirements of different application scenes are met. The preparation process is simple and efficient, and is easy to realize large-scale production.
Drawings
FIG. 1 is an overall flow chart of one embodiment of the present invention;
FIG. 2 is a thermal expansion test curve of the thermomechanical cycle training for different training loads of example 1 of the present invention;
FIG. 3 is a graph of thermal expansion test for different numbers of thermal mechanical cycling exercises for example 2 of the present invention;
FIG. 4 is a thermal expansion test curve of the thermomechanical cycle training at different training temperatures according to example 3 of the present invention.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Examples
FIG. 1 shows a flow chart of an overall method of preparing an alloy with adjustable expansion coefficient according to one embodiment of the present invention, as shown in FIG. 1, comprising:
Step 100: preparing raw materials according to the atomic percentage of the alloy; the alloy comprises titanium and niobium, and the atomic percentages of the titanium and the niobium in the alloy are as follows: titanium: niobium=3:1;
Step 200: putting the prepared raw materials into an arc melting furnace for repeated melting to obtain a first material, wherein the method comprises the following steps of:
Placing the prepared raw materials into an arc melting furnace, and extracting vacuum to a preset vacuum degree, wherein the preset vacuum degree is less than or equal to 4.5 multiplied by 10 -3 Pa;
argon is filled to a preset pressure, wherein the preset pressure is 0.4X10 5Pa～0.6×105 Pa;
repeatedly smelting, wherein the smelting temperature is as follows: 2500-2900 ℃; the smelting times are more than or equal to 5 times;
Step 300: the first material is hot rolled into a plate, and then solution treatment is carried out to obtain a second material, wherein the second material comprises;
The hot rolling temperature of the first material is 800-900 ℃;
packaging the hot-rolled first material in a quartz tube for solution treatment;
The vacuum degree in the encapsulated quartz tube is less than or equal to 1 multiplied by 10 -4 Pa, the temperature of the solution treatment is 1100 ℃, and the solution treatment time is more than or equal to 24 hours;
step 400: and performing cold rolling process treatment on the second material to obtain a third material, wherein the cold rolling process treatment comprises the following steps:
the deformation of the cold rolling process is 90%;
cutting the second material subjected to the cold rolling process into a dog bone shape to obtain a third material;
step 500: performing thermo-mechanical cycling training on the third material to obtain an alloy, comprising:
heating the third material to a preset temperature under a preset training load;
stretching the third material by applying an axial force in the rolling direction in a heated state;
Cooling the third material in a stretched state;
after the temperature is reduced to room temperature, unloading the axial force;
Repeating the step 500 to the preset training times to obtain the alloy.
Further, in this embodiment, when the preset training loads are 300MPa and 450MPa, the preset temperatures are 50 ℃, 100 ℃, and 150 ℃ respectively, and the preset training times are 5 times and 10 times respectively, the prepared alloy has a reversible negative thermal expansion coefficient of-10.1x10 -6K-1～-40.6×10-6K-1 within a temperature range of-40 ℃ to 60 ℃.
Further, in this embodiment, when the preset training loads are 300MPa and 450MPa, the preset temperatures are 50 ℃, 100 ℃, and 150 ℃ respectively, and the preset training times are 5 times and 10 times respectively, the prepared alloy has an adjustable negative thermal expansion coefficient of-87×10 -6K-1～-216.2×10-6K-1 within a temperature range of 125 ℃ to 225 ℃.
An alloy with adjustable expansion coefficient, prepared by the preparation method, wherein the alloy has reversible negative thermal expansion coefficient of-10.1X10 -6K-1～-40.6×10-6K-1 in the temperature range of-40 ℃ to 60 ℃; the alloy has an adjustable negative thermal expansion coefficient of-87 x 10 -6K-1～-216.2×10-6K-1 in a temperature range of 125 ℃ to 225 ℃.
The invention realizes controllable reversible negative thermal expansion coefficient and super-large negative thermal expansion coefficient through thermal mechanical cycle training of the prepared alloy; in the thermo-mechanical cycle training, the alloy is changed in microstructure by controlling key parameters such as temperature, pressure and the like, so that excellent negative thermal expansion performance is obtained. According to the invention, the negative thermal expansion coefficient of the material is regulated and controlled by adjusting the thermal mechanical cycle training parameters, so that the requirements of different application scenes are met. The preparation process is simple and efficient, and is easy to realize large-scale production.
Example 1
Thermo-mechanical cycling training of Ti 75Nb25 alloys at different training loads;
The preparation method of the adjustable alloy with the expansion coefficient in the embodiment is as follows: preparing raw materials according to the atomic metering ratio of Ti 75Nb25, placing the Ti and Nb simple substance raw materials with purity of more than 99.99 percent into an arc melting furnace, vacuumizing to below 4.5X10 - 3 Pa, melting under the condition of filling argon to 0.4X10 5 Pa to obtain an ingot, melting at 2500 ℃, repeatedly melting the ingot for 6 times to obtain a homogeneous ingot, hot-rolling the ingot into a plate at 800 ℃, packaging the plate into a quartz tube with vacuum degree of 1X 10 -4 Pa, carrying out solution treatment at 1100 ℃ for 25 hours, cold-rolling the plate at room temperature along the same direction, rolling a rolling deformation amount of 90%, cutting into dog bones with length of 20mm and width of 3mm by using an electric spark wire to obtain a third material, obtaining a sample 1 of the first embodiment, fixing the third material on a fixture by using a universal testing machine, placing the third material into an incubator, and carrying out thermal mechanical cycle training on the third material to obtain the sample 2 of the first embodiment and the sample 3 of the first embodiment.
The thermo-mechanical cycling training step of sample 2 of the first embodiment is divided into the following steps:
(1) Heating the third material to 100 ℃;
(2) Applying 300MPa axial force at 100 ℃ to stretch;
(3) Maintaining the stretching state of the sample, and cooling the sample to room temperature;
(4) After the temperature of the sample is reduced to room temperature, unloading the axial force;
(5) Repeating the steps (1) - (4) for 5 times.
The thermo-mechanical cycling training step of sample 3 of the first embodiment is divided into the following steps:
(1) Heating the third material to 100 ℃;
(2) Applying 450MPa axial force at 100 ℃ to stretch;
(3) Maintaining the stretching state of the third material, and cooling the third material to room temperature;
(4) After the temperature of the third material is reduced to room temperature, unloading the axial force;
(5) Repeating the steps (1) - (4) for 5 times.
FIG. 2 is a thermal expansion test curve of the thermomechanical cycle training for different training loads of example 1 of the present invention; the thermal expansion coefficients of sample 1, sample 2 and sample 3 of the first example were tested, and the test results as in fig. 2 (a) (b) (c) were obtained. As can be seen from FIG. 2 (a), the negative thermal expansion is completely reversible in the first and second warm-up cycles (-40-125 ℃) and the average linear expansion coefficient at-40-60 ℃ is-10.1X10 -6K-1. In the third temperature rise and fall cycle (-40-400 ℃), the maximum negative thermal expansion coefficient can be obtained, and the average linear expansion coefficient at 125-225 ℃ is-87 multiplied by 10 -6K-1. As can be seen from FIG. 2 (b), after the thermo-mechanical cycling training, the average linear expansion coefficient at-40 to 60℃was-29.5X10 -6K-1, and the average linear expansion coefficient at 125 to 225℃was-166.5X10: 10 -6K-1, both of which were increased in reversible negative thermal expansion coefficient and maximum negative thermal expansion coefficient value as compared with sample 1 without the thermo-mechanical training. Similarly, as can be seen from FIG. 2 (c), after the training load was increased compared to FIG. 3 (b), sample 3 had a strain shrinkage of 0.5% after the first test cycle, an average linear expansion coefficient of-10.6X10 -6K-1 at-40 to 60℃and an average linear expansion coefficient of-90X 10 -6K-1 at 125 to 225℃and had substantially no change in the reversible negative thermal expansion coefficient and the maximum negative thermal expansion coefficient value as compared to sample 1 without the thermal mechanical training, and as a result showed a training load of 300MPa as the optimal thermal mechanical training load.
Example 2
Ti 75Nb25 alloys trained by thermo-mechanical cycles of different training times;
The preparation method of the adjustable alloy with the expansion coefficient in the embodiment is as follows: preparing raw materials according to the atomic weight ratio of Ti 75Nb25, placing the Ti and Nb simple substance raw materials with purity of more than 99.99 percent into an arc melting furnace, vacuumizing to below 4.5X10 - 3 Pa, melting under the condition of filling argon to 0.5X10 5 Pa to obtain an ingot, repeatedly melting the ingot for 5 times to obtain a homogeneous ingot, hot-rolling the ingot into a plate at 850 ℃, packaging the plate into a quartz tube with vacuum degree of 1X 10 -4 Pa, carrying out solution treatment at 1100 ℃ for 24 hours, cold-rolling the plate at room temperature along the same direction, rolling deformation amount of 90%, cutting into dog bones with length of 20mm and width of 3mm by using an electric spark wire to obtain a third material, fixing the third material on a fixture by using a universal tester, placing the third material into a temperature box, and carrying out mechanical cycle training on the third material to obtain a sample 2 of the second embodiment and a sample 3 of the second embodiment.
The thermo-mechanical cycling training step of sample 2 of the second embodiment is divided into the following steps:
(1) Heating the third material to 100 ℃;
(2) Applying 300MPa axial force at 100 ℃ to stretch;
(3) Maintaining the stretching state of the third material, and cooling the third material to room temperature;
(4) After the temperature of the third material is reduced to room temperature, unloading the axial force;
(5) Repeating the steps (1) - (4) for 5 times.
The thermo-mechanical cycling training step of sample 3 of the second embodiment is divided into the following steps:
(1) Heating the third material to 100 ℃;
(2) Applying 300MPa axial force at 100 ℃ to stretch;
(3) Maintaining the stretching state of the third material, and cooling the third material to room temperature;
(4) After the temperature of the sample is reduced to room temperature, unloading the axial force;
(5) Repeating the steps (1) - (4) for 10 times.
The thermal expansion coefficients of sample 1, sample 2 and sample 3 of the second example were tested, and the test results as in fig. 3 (a) (b) (c) were obtained. As can be seen from FIG. 3 (a), the negative thermal expansion is completely reversible in the first and second warm-up cycles (-40-125 ℃) and the average linear expansion coefficient at-40-60 ℃ is-10.1X10 -6K-1. In the third temperature rise and fall cycle (-40-400 ℃), the maximum negative thermal expansion coefficient can be obtained, and the average linear expansion coefficient at 125-225 ℃ is-87 multiplied by 10 -6K-1. As can be seen from FIG. 3 (b), after the thermo-mechanical cycling training, the average linear expansion coefficient at-40 to 60℃was-29.5X10 -6K-1, and the average linear expansion coefficient at 125 to 225℃was-166.5X10: 10 -6K-1, both of which were increased in reversible negative thermal expansion coefficient and maximum negative thermal expansion coefficient value as compared with sample 1 without the thermo-mechanical training. Similarly, as can be seen from FIG. 3 (c), after the number of training steps is increased as compared with FIG. 3 (b), the average linear expansion coefficient at-40 to 60 ℃ is-20.8X10 -6K-1, the average linear expansion coefficient at 125 to 225 ℃ is-124.4X10 -6K-1, and both the reversible negative thermal expansion coefficient and the maximum negative thermal expansion coefficient value are increased as compared with sample 1 without thermal mechanical training, but are reduced as compared with sample 2, and as a result, the number of training steps is 5 as the optimal number of thermal mechanical training steps.
Example 3
Thermo-mechanical cycling training of Ti 75Nb25 alloys at different training temperatures;
The preparation method of the adjustable alloy with the expansion coefficient in the embodiment is as follows: preparing raw materials according to the atomic metering ratio of Ti 75Nb25, placing the Ti and Nb simple substance raw materials with purity of more than 99.99 percent into an arc melting furnace, vacuumizing to below 4.5X10 - 3 Pa, melting under the condition of filling argon to 0.6X10 5 Pa to obtain an ingot, repeatedly melting the ingot for 5 times to obtain a homogeneous ingot at the temperature of 2900 ℃, hot-rolling the ingot into a plate at the temperature of 900 ℃, packaging the plate into a quartz tube with the vacuum degree of 1X 10 -4 Pa, carrying out solution treatment at the temperature of 1100 ℃, carrying out solution treatment for 24 hours, carrying out cold rolling treatment on the plate at room temperature along the same direction, rolling deformation amount of 90%, cutting into dog bones with the length of 20mm and the width of 3mm by using an electric spark wire, obtaining a sample 1 of a third embodiment, fixing the third material on a fixture by using a universal testing machine, putting the third material into a thermal mechanical cycle training on the third material, and obtaining samples 2,3 and 4 of the third embodiment.
The thermo-mechanical cycling training step of sample 2 of the third example was divided into the following steps:
(1) Heating the third material to 50 ℃;
(2) Applying 300MPa axial force at 100 ℃ to stretch;
(3) Maintaining the stretching state of the third material, and cooling the third material to room temperature;
(4) After the temperature of the sample is reduced to room temperature, unloading the axial force;
(5) Repeating the steps (1) - (4) for 5 times.
The thermo-mechanical cycling training step of sample 3 of the third example was divided into the following steps:
(1) Heating the third material to 100 ℃;
(2) Applying 300MPa axial force at 100 ℃ to stretch;
(3) Maintaining the stretching state of the third material, and cooling the third material to room temperature;
(4) After the temperature of the third material is reduced to room temperature, unloading the axial force;
(5) Repeating the steps (1) - (4) for 5 times.
The thermo-mechanical cycling training step of sample 4 of the third example was divided into the following steps:
(1) Heating the third material to 150 ℃;
(2) Applying 300MPa axial force at 100 ℃ to stretch;
(3) Maintaining the stretching state of the third material, and cooling the third material to room temperature;
(4) After the temperature of the third material is reduced to room temperature, unloading the axial force;
(5) Repeating the steps (1) - (4) for 5 times.
The thermal expansion coefficients of sample 1, sample 2, sample 3 and sample 4 of the third example were tested, and the test results as in fig. 4 (a) (b) (c) (d) were obtained. As can be seen from FIG. 4 (a), the negative thermal expansion is completely reversible in the first and second warm-up cycles (-40-125 ℃) and the average linear expansion coefficient at-40-60 ℃ is-10.1X10 -6K-1. In the third temperature rise and fall cycle (-40-400 ℃), the maximum negative thermal expansion coefficient can be obtained, and the average linear expansion coefficient at 125-225 ℃ is-87 multiplied by 10 -6K-1. As can be seen from FIG. 4 (b), after training in a thermo-mechanical cycle, the average linear expansion coefficient at-40 to 60℃was-19.1X10 -6K-1, and the average linear expansion coefficient at 125 to 225℃was-216.2X10 -6K-1. As shown in FIG. 4 (c), the average linear expansion coefficient at-40 to 60℃was-29.5X10 -6K-1, the average linear expansion coefficient at 125 to 225℃was-166.5X10 -6K-1, and as shown in FIG. 4 (d), the average linear expansion coefficient at-40 to 60℃was-40.6X10 -6K-1, and the average linear expansion coefficient at 125 to 225℃was-143X 10 -6K-1. It can be seen that three different thermo-mechanical training temperatures can both increase the reversible negative thermal expansion coefficient and the maximum negative thermal expansion coefficient value compared to sample 1 without thermo-mechanical training, but that sample 2 with the lower training temperature has the maximum negative thermal expansion coefficient and sample 4 with the higher training temperature has the maximum reversible negative thermal expansion coefficient.
The adjustable reversible negative thermal expansion coefficient and the ultra-large negative thermal expansion coefficient are obtained by carrying out variable-parameter thermo-mechanical cycle training on the prepared Ti 75Nb25 alloy, particularly, the maximum value of the negative thermal expansion coefficient is-216.2X10 -6K-1 for samples with the training temperature of 50 ℃, the training load of 300MPa and the training times of 5, and the reversible negative thermal expansion coefficient is-40.6X10 -6K-1 for samples with the training temperature of 150 ℃, the training load of 300MPa and the training times of 5, so that the extremely excellent negative thermal expansion performance is obtained, and in addition, the preparation process is simple, the practical application value is very high, and the mass production can be realized.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
The invention has been described above with reference to the embodiments thereof. These examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be made by those skilled in the art without departing from the scope of the invention, and such alternatives and modifications are intended to fall within the scope of the invention.
Although embodiments of the present invention have been described in detail, it should be understood that various changes, substitutions, and alterations can be made hereto without departing from the spirit and scope of the invention.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (10)
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| CN202410723128.4A CN118726775B (en) | 2024-06-05 | 2024-06-05 | Alloy with adjustable expansion coefficient and preparation method thereof |
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| JP2009263720A (en) * | 2008-04-24 | 2009-11-12 | Nippon Light Metal Co Ltd | Low thermal expansion aluminum alloy sheet material having excellent proof stress, and method for producing the same |
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