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Preparation method of heat-resistant high-strength Al-Li-Cu-Ce alloy plate

An al-li-cu-ce, alloy plate technology, applied in the field of non-ferrous metal alloys, can solve the problems of less research and reports, improve heat resistance, slow down high temperature roughening rate, improve thermal stability and high temperature deformation The effect of uniformity

Active Publication Date: 2021-04-06
YANTAI NANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is necessary to develop a heat-resistant high-strength Al-Li-Cu alloy that can still have thermal stability in a high temperature environment greater than 200 ° C, but there are still few studies and reports in this area.

Method used

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  • Preparation method of heat-resistant high-strength Al-Li-Cu-Ce alloy plate
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  • Preparation method of heat-resistant high-strength Al-Li-Cu-Ce alloy plate

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Embodiment

[0024] Embodiments, a method for preparing a heat-resistant high-strength Al-Li-Cu-Ce alloy plate is carried out according to the following steps:

[0025] a. Melting and casting: Alloy melting is carried out in a high-temperature resistance furnace, using pure Al, pure Li, pure Ag, pure Mg and intermediate alloys Al-Cu, Al-Ce as alloy melting raw materials, and the chemical composition of the experimental raw materials is pure Al ((99.9 wt%)), pure Mg (99.9 wt%), pure Li (99.9 wt%) Ag (99.9 wt%), and master alloys Al-Cu (50.0 wt%), Al-Ce (10.0 wt%). Firstly, pure Al, pure Ag and intermediate alloys Al-Cu and Al-Ce are added to the high-purity graphite crucible, and then the furnace temperature is raised to 780°C. At the same time, add refining agent to isolate the humid air and prevent the melt from absorbing hydrogen. After the alloy is completely melted, the furnace temperature is lowered to 740°C, and 4g of paper-wrapped hexachloroethane (C 2 Cl 6 ) is placed in a bell ...

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Abstract

The invention relates to a preparation method of a heat-resistant high-strength Al-Li-Cu-Ce alloy plate. The preparation method improves the heat resistance (heat exposure and high-temperature stretching) of an Al-Li-Cu alloy and realizes the preparation of the heat-resistant high-strength Al-Li-Cu-Ce alloy plate through microalloying of Ce and effective control of the whole process of the preparation process. On the one hand, the precipitation ratio of a T1 (Al2CuLi) phase with heat-resistant potential in the alloy is increased by improving the synergistic effect of Cu / Li in the alloy and pre-deformation before aging, and meanwhile, by adding a trace amount of Ce, coarsening of the T1 (Al2CuLi) phase and refinement of Ce-containing intermetallic compounds can be effectively inhibited by inhibiting diffusion of a main element Cu in the alloy; and the thermal stability and the high-temperature deformation uniformity of the alloy are greatly improved. The method is simple in equipment requirement, high in repeatability and suitable for large-scale commercial production, can be used as a novel aircraft heat-resistant structural part material in the aerospace field, and has a practical application value.

Description

technical field [0001] The invention belongs to the field of nonferrous metal alloys, in particular to a method for preparing a heat-resistant high-strength Al-Li-Cu-Ce alloy plate. Background technique [0002] Compared with traditional commercial aluminum alloys, Al-Li-Cu alloys have the characteristics of low density, high strength and fracture toughness, and better fatigue and corrosion resistance. The use of Al-Li-Cu alloy as the main structural material of the aircraft will greatly improve the effective carrying capacity and fuel efficiency of the aircraft, making Al-Li-Cu alloy the most competitive alternative to traditional 2xxx and 7xxx aluminum alloys in new aircraft designs force material. Since Al-Li-Cu alloys have huge potential application prospects in modern fighter fuselages, wing structures, bulkheads near engines, and other high-temperature structural components that require high-temperature resistance, it is urgent to develop a heat-resistant and high-str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/06C22C21/16C22F1/057
CPCC22C1/026C22C1/03C22C1/06C22C21/16C22F1/057
Inventor 余鑫祥戴菡赵志国史丹丹史先利董晓燕
Owner YANTAI NANSHAN UNIV
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