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Alloying method for in-situ autogenous strengthening of cast aluminum-lithium alloys induced by icosahedral quasicrystal phase

An in-situ self-generated and icosahedral technology, applied in the field of in-situ self-generated and strengthened cast Al-Li alloys induced by quasi-crystalline phases, can solve the problems of aggravated coplanar slip tendency and decreased strength and toughness of the alloy

Active Publication Date: 2022-04-29
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem that the large amount of δ'-Al3Li particles precipitated during the existing aluminum-lithium alloy casting process will intensify the coplanar slip tendency, and the stress concentration phenomenon at the grain boundary will become more obvious, which will lead to a significant decrease in the strength and toughness of the alloy. problem, and to provide an alloying method for in-situ autogenous strengthening of cast aluminum-lithium alloys by inducing icosahedral quasi-crystal phase

Method used

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  • Alloying method for in-situ autogenous strengthening of cast aluminum-lithium alloys induced by icosahedral quasicrystal phase
  • Alloying method for in-situ autogenous strengthening of cast aluminum-lithium alloys induced by icosahedral quasicrystal phase
  • Alloying method for in-situ autogenous strengthening of cast aluminum-lithium alloys induced by icosahedral quasicrystal phase

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specific Embodiment approach 1

[0031] Specific implementation mode 1: This implementation mode is an alloying method for in situ authigenic casting aluminum-lithium alloy induced by icosahedral quasi-crystal phase, which is specifically carried out according to the following steps:

[0032] 1. Select pure aluminum, pure magnesium, pure lithium particles, Al-50Cu master alloy, Al-4Zr master alloy and aluminum-based master alloy containing alloying elements, and then remove the surface oxide scale and surface layer from the above-mentioned selected raw materials;

[0033] Wrap pure magnesium and pure lithium particles with aluminum foil;

[0034] The aluminum-based master alloy containing alloying elements is an Al-10Ni master alloy, and the finally prepared aluminum-lithium alloy is composed of: 1.8% to 3.2% Li, 0.5% to 2% Cu, 0.5% %~1.8% Mg, 0.04%~0.21% Zr, 0.2%~0.95% Ni, and the rest is Al;

[0035]The aluminum-based master alloy containing alloying elements can also be an Al-4V master alloy, and the fina...

specific Embodiment approach 2

[0038] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the aluminum-based master alloy containing alloying elements described in step 1 is an Al-10Ni master alloy, and the final prepared aluminum-lithium alloy is divided by mass The array is: 2.51% Li, 1.11% Cu, 1.38% Mg, 0.21% Zr, 0.24% Ni, and the rest is Al. Others are the same as the first embodiment.

specific Embodiment approach 3

[0039] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the aluminum-based master alloy containing alloying elements described in step 1 is an Al-10Ni master alloy, and the aluminum-lithium alloy finally prepared is as follows: The mass fraction composition is: 2.35% Li, 0.96% Cu, 1.22% Mg, 0.19% Zr, 0.44% Ni, and the rest is Al. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses an alloying method for inducing icosahedral quasi-crystal phase in-situ self-generated strengthening cast aluminum-lithium alloy, and relates to a method for inducing quasi-crystal phase in-situ self-generated strengthened cast aluminum-lithium alloy. The present invention is to solve the problem of δ'-Al in the existing process of casting aluminum-lithium alloy 3 A large amount of precipitation of Li particles will intensify the tendency of coplanar slip, and the stress concentration phenomenon at the grain boundary will become more and more obvious, which will lead to the technical problem that the strength and toughness of the alloy will decrease significantly. The invention relates to an alloying method for in-situ self-generated and enhanced cast aluminum-lithium alloys induced by quasi-crystal phases, and Al in quasi-crystal strengthened cast aluminum-lithium alloys 3 While the number of Li-strengthened particle precipitation is suppressed, the icosahedral quasi-crystalline phase T 2 ‑Al 6 CuLi 3 The number of precipitates is greatly increased, and the strength and plasticity of the alloy are increased by more than five times.

Description

technical field [0001] The invention relates to a method for inducing quasi-crystalline phase in-situ self-generated strengthening cast aluminum-lithium alloy. Background technique [0002] With the increasing shortage of petroleum resources and the increasingly complex structure of modern structural devices, especially in the high-end manufacturing fields of major equipment such as aerospace and military industry, the development of new preparation technologies and new materials is urgently needed. Aluminum-lithium alloy has the advantages of low density, high specific strength, high specific stiffness, good corrosion resistance and good fatigue resistance. Using it to replace conventional aluminum alloys can reduce the weight of components by 10% to 20%, and increase the stiffness by 15% to 20%. %, is an ideal aerospace structural material. [0003] At present, the research and development of Al-Li alloys is almost completely limited to deformed Al-Li alloys. Aluminum-li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03B22D7/00C22C21/00C22F1/04
CPCC22C1/03C22C1/026C22C21/00B22D7/005C22F1/04
Inventor 张雪健邹鹑鸣王宏伟魏尊杰朱兆军
Owner HARBIN INST OF TECH