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WO2024144655A1 - Procédé d'obtention d'une phase de silicium sphérique dans des alliages d'aluminium - Google Patents

Procédé d'obtention d'une phase de silicium sphérique dans des alliages d'aluminium Download PDF

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Publication number
WO2024144655A1
WO2024144655A1 PCT/TR2023/051622 TR2023051622W WO2024144655A1 WO 2024144655 A1 WO2024144655 A1 WO 2024144655A1 TR 2023051622 W TR2023051622 W TR 2023051622W WO 2024144655 A1 WO2024144655 A1 WO 2024144655A1
Authority
WO
WIPO (PCT)
Prior art keywords
temperature
solution
alloy
aluminum
heat treatment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/TR2023/051622
Other languages
English (en)
Inventor
Hasan HASIRCI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gazi Universitesi
Original Assignee
Gazi Universitesi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from TR2022/021830 external-priority patent/TR2022021830A1/tr
Application filed by Gazi Universitesi filed Critical Gazi Universitesi
Priority to EP23913253.3A priority Critical patent/EP4642946A1/fr
Publication of WO2024144655A1 publication Critical patent/WO2024144655A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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

Definitions

  • the invention is particularly related to the semi-isothermal heat treatment method with fluctuating/wavy temperature application, which ensures that the silicon phase in aluminum alloys becomes spherical and the alloy does not liquefy.
  • alloying elements With the alloying elements added into aluminum alloys, they improve the properties of the main metal, aluminium. Copper, an alloying element, provides hardness, strength and ease of machining to aluminum and contributes to the increase in density and strength. If copper is added to aluminum more than 12%, it increases the brittleness of aluminum. Nickel, which gives strength and hardness to aluminum by adding it in certain proportions like copper, increases the surface quality of aluminum by increasing its brightness and reflectivity properties. Titanium and boron alloy elements added to aluminum are used as grain reducers and increase tensile strength and ductility. Iron, another alloying element added to aluminum, increases strength and hardness at high temperatures.
  • the patent file numbered "TR200701976" is in the state of the art was examined.
  • the invention relates to a method for improving the mechanical properties of Aluminum-Silicon alloys.
  • the invention relates to a heat treatment method for improving the material softness of objects having a maximum meltable phase fraction, preferably made of enriched or purified Aluminum-Silicon alloy, optionally a casting alloy or kneading alloy containing other alloying elements and/or polluting elements, wherein these objects are subjected to an annealing process with subsequent aging/maturing.
  • Another aim of the invention is to realize the single-stage process of adding to a solution, which exists in the state of the art, in three fluctuating process steps/wavy manner showing increasing, decreasing and increasing temperature, unlike the isothermal process step-by-step solution taking in the known state of the art.
  • the number of these increases and decreases varies depending on the material chemical composition, section thickness and part shape. In this way, the spheroidisation of the silicon phase is ensured and the liquefaction of the alloy is prevented.
  • the heat treatment method of the invention increases the mechanical properties of the alloy (100) by causing a change in the shape of the silicon phase (1 10) in the alloy (100) with a diffusion mechanism with fluctuating/wavy temperature via the first temperature increasing step (Si) depending on time, then the temperature decreasing step (S2) and then the second temperature increasing step (S3) again.
  • the heat given around the silicon phases (1 10) increases the entropy and a diffusion movement (D) occurs from the silicon phase (1 10) to the alloy (100).
  • a diffusion movement (D) occurs from the silicon phase (1 10) to the alloy (100).
  • This diffusion movement (D) which occurs with the first temperature increasing step (Si) occurs faster since the pointed ends of the lamellar structure of the silicon phase (110) are high-energy regions, and the silicon phase (1 10) loses its thin and long lamellar structure and becomes more elliptically spherical.
  • the spherical silicon phase (1 10) increases the strength of the alloy (100).
  • the first temperature increasing step (Si) is followed by the temperature decreasing step (S2) in which the temperature decreases.
  • the temperature decreasing step (S2) diffusion movement occurs from the alloy (100) to the silicon phase (1 10).
  • the aim of the temperature-decreasing step (S2) is to prevent the liquefaction of the alloy (100) and to prevent the phases within the alloy (100) that are likely to melt from liquefying.
  • the temperature decreasing step (S2) is followed by the second temperature increasing step (S3), in which the temperature increases again.
  • the process step adding to solution (C) takes 0.5-6 hours depending on the thickness and chemical composition of the aluminum alloy (100) and the process step of aging (Y) takes between 0.5-10 hours, depending on the thickness and chemical composition of the aluminum alloy (100).
  • the process step of aging (Y) preferably lasts between 2- 10 hours.
  • the process step adding to solution (C) which comprises the first temperature increasing step (Si), then the temperature decreasing step (S2) and then the second temperature increasing step (S3) again, for the spheroidisation of the silicon phase (110) after the second temperature increasing step (S3), the first temperature increasing step (Si), then the temperature decreasing step (S2) and then the second temperature increasing step (S3) can be repeated.
  • Figure 1 shows the heat treatment chart applied to aluminum alloys (100) containing the silicon element in the state of the art.
  • aluminum alloy (100) is heated from the initial temperature (To) to the temperature of adding to solution (T1) is kept at temperature of adding to solution (T1) for a certain period of time in the process step of adding to solution (C), and then cooled by applying sudden cooling (A) (quenching) and then heated to the aging temperature (T2) and then subjected to the process step of aging (Y) in which it is cooled again to the initial temperature by applying the aging temperature (T2) for a certain period of time.
  • sudden cooling A
  • T2 aging temperature
  • Y process step of aging
  • the initial temperature (To) is room temperature
  • the temperature of adding to solution (T-i) is between 450-550°C
  • the aging temperature (T2) is between 150-250°C.
  • the semi-isothermal heat process of the invention comprises the process steps of: I. Heating the aluminum alloy (100) with a constant temperature increase from the initial temperature (To) to the temperature of adding to solution (T-i),

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Conductive Materials (AREA)

Abstract

L'invention concerne un procédé de traitement thermique semi-isotherme avec application de température fluctuante/ondulée (non isotherme), qui assure que la phase de silicium dans les alliages d'aluminium devient sphérique et que l'alliage ne se liquéfie pas.
PCT/TR2023/051622 2022-12-30 2023-12-21 Procédé d'obtention d'une phase de silicium sphérique dans des alliages d'aluminium Ceased WO2024144655A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP23913253.3A EP4642946A1 (fr) 2022-12-30 2023-12-21 Procédé d'obtention d'une phase de silicium sphérique dans des alliages d'aluminium

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2022/021830 TR2022021830A1 (tr) 2022-12-30 Alüminyum alaşımlarında küresel silisyum fazının elde edilmesini sağlayan yöntem.
TR2022021830 2022-12-30

Publications (1)

Publication Number Publication Date
WO2024144655A1 true WO2024144655A1 (fr) 2024-07-04

Family

ID=91718912

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/TR2023/051622 Ceased WO2024144655A1 (fr) 2022-12-30 2023-12-21 Procédé d'obtention d'une phase de silicium sphérique dans des alliages d'aluminium

Country Status (1)

Country Link
WO (1) WO2024144655A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5922147A (en) * 1995-05-19 1999-07-13 Tenedora Nemak, S.A. De C.V. Method and apparatus for simplified production of heat-treatable aluminum alloy castings
WO2004065043A2 (fr) * 2003-01-21 2004-08-05 Alcoa Inc. Procede de reduction de la duree de production de pieces moulees en alliage d'aluminium traitees par la chaleur
KR20150101744A (ko) * 2014-02-27 2015-09-04 조선대학교산학협력단 알루미늄 합금의 2단 열처리 방법

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5922147A (en) * 1995-05-19 1999-07-13 Tenedora Nemak, S.A. De C.V. Method and apparatus for simplified production of heat-treatable aluminum alloy castings
WO2004065043A2 (fr) * 2003-01-21 2004-08-05 Alcoa Inc. Procede de reduction de la duree de production de pieces moulees en alliage d'aluminium traitees par la chaleur
KR20150101744A (ko) * 2014-02-27 2015-09-04 조선대학교산학협력단 알루미늄 합금의 2단 열처리 방법

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