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Alloying method for inducing icosahedron quasicrystal phase to be subjected to in-situ synthesis to reinforce cast aluminum-lithium alloy

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: 2021-08-13
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 inducing icosahedron quasicrystal phase to be subjected to in-situ synthesis to reinforce cast aluminum-lithium alloy
  • Alloying method for inducing icosahedron quasicrystal phase to be subjected to in-situ synthesis to reinforce cast aluminum-lithium alloy
  • Alloying method for inducing icosahedron quasicrystal phase to be subjected to in-situ synthesis to reinforce cast aluminum-lithium alloy

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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 an icosahedron quasicrystal phase to be subjected to in-situ synthesis to reinforce cast aluminum-lithium alloy, and relates to the method for inducing the quasicrystal phase to be subjected to in-situ synthesis to reinforce the cast aluminum-lithium alloy. The method aims to solve the technical problems that in the existing aluminum-lithium alloy casting process, a large number of delta'-Al3Li particles are separated out, the coplanar slippage tendency is intensified, the stress concentration phenomenon at the grain boundary is more obvious, and the obdurability of the alloy is obviously reduced. The invention relates to the alloying method for inducing the quasicrystal phase to be subjected to in-situ synthesis to reinforce the cast aluminum-lithium alloy, the separation-out number of Al3Li reinforcing particles in the quasicrystal reinforced cast aluminum-lithium alloy is inhibited, meanwhile, the separation-out number of icosahedron quasicrystal phases T2-Al6CuLi3 is greatly increased, and the product of strength and ductility of alloy is improved 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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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
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