A kind of high recrystallization resistance and high strength and toughness aluminum-lithium alloy and preparation method thereof
An aluminum-lithium alloy and recrystallization technology, which is applied in the field of aluminum alloy manufacturing, can solve problems such as lack, and achieve the effects of easy operation, improved comprehensive performance, and simple equipment requirements
Active Publication Date: 2022-03-25
SHANDONG NANSHAN ALUMINUM +1
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[0005] In order to solve the deficiencies in the prior art, the present invention provides a high recrystallization resistance and high toughness aluminum-lithium alloy and its preparation method, which is added through Ce, Zr composite micro-alloying, and builds nano-sized Ce-containing dispersions at the alloy grain boundaries Phase, in order to make up for the single addition of Zr alloy due to Al 3 The lack of Zr in the grain boundary leads to insufficient ability of the alloy to inhibit recrystallization, so that the strength and fracture toughness of the alloy are comprehensively improved, which has very realistic application value
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[0029] A method for preparing an aluminum-lithium alloy with high recrystallization resistance and high strength and toughness, comprising the following steps:
[0030] S1: Raise the temperature of the well-type resistance furnace for alloy smelting to 760°C, and add pure Al, pure Ag, Al-Cu, Al-Zr, Al-Ce into the graphite crucible in the well-type resistance furnace according to the mass percentage of claim 1 The master alloy raw material is heated and melted, and an appropriate fraction of covering agent (LiF and LiCl are mixed according to the ratio of 1:2) is added, wherein the Li content in the covering agent does not exceed 1.2% of the total mass fraction; wherein, each raw material Adoption: industrial pure Al (99.85wt%), pure Ag (99.9wt%) and master alloy Al-Cu (50wt%), Al-Zr (3.29wt%), Al-Ce (10wt%).
[0031] S2: After the alloy added in step S1 is melted, put hexachloroethane in a bell jar and press it into the melt, remove the slag after the degassing is completed, t...
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The invention provides an aluminum-lithium alloy with high recrystallization resistance and high strength and toughness and a preparation method thereof, and mainly relates to the technical field of aluminum alloy manufacturing. The present invention adopts the addition of Ce in the Al-Cu-Li-Zr (wt%) alloy, casts through smelting and water-cooled copper mold quenching technology, and prepares the alloy through homogenization annealing, large rolling ratio rolling and solution treatment. new alloy. The reverse diffusion and segregation mode of Ce and Zr elements is used to realize the uniform distribution of the dispersed phase in the alloy at the grain boundary and within the grain, especially the nano-sized Al 8 Cu 4 Efficient pinning of Ce particles to alloy grain boundaries. The beneficial effect of the present invention is that: the design and preparation process of the present invention provides a more economical and convenient technical means for improving the strength and toughness of the aluminum-lithium alloy as a whole.
Description
technical field [0001] The invention mainly relates to the technical field of aluminum alloy manufacturing, in particular to an aluminum-lithium alloy with high recrystallization resistance and high strength and toughness and a preparation method thereof. Background technique [0002] Advanced Al-Cu-Li alloy has excellent characteristics such as low density, high elastic modulus, high specific strength and specific stiffness, low fatigue crack growth rate, good high and low temperature performance and weldability, making it a very competitive A new generation of high-end aerospace materials. However, it is still difficult to combine the excellent strength and toughness of Al-Cu-Li alloy at present. It is generally believed that the strength and fracture toughness of the alloy can be comprehensively improved by inhibiting the recrystallization of the alloy and retaining the fibrous deformed grain structure. In addition, during the preparation of high-performance Al-Cu-Li all...
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IPC IPC(8): C22C21/16C22C1/03C22F1/057
CPCC22C21/16C22C1/026C22C1/03C22F1/057
Inventor 赵志国史丹丹史先利戴菡余鑫祥郭新汝钟娟
Owner SHANDONG NANSHAN ALUMINUM