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Method for improving overall performance of AA7075 aluminum alloy by adding rare earth Sb

An AA7075, comprehensive performance technology, applied in the field of AA7075 aluminum alloy performance optimization, can solve the problems of inability to heat treatment, low mechanical properties, etc., and achieve the effect of grain refinement, yield strength and fracture toughness, and optimization effect is obvious.

Inactive Publication Date: 2016-01-27
王晓芳
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  • Claims
  • Application Information

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Problems solved by technology

AA7075 aluminum alloy has high temperature strength, corrosion resistance, welding performance, casting performance, and superior cutting performance, but because it cannot be heat treated, its mechanical properties are low

Method used

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  • Method for improving overall performance of AA7075 aluminum alloy by adding rare earth Sb
  • Method for improving overall performance of AA7075 aluminum alloy by adding rare earth Sb
  • Method for improving overall performance of AA7075 aluminum alloy by adding rare earth Sb

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Experimental program
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Embodiment

[0015] Based on AA7075 aluminum alloy (composition: Al-7.5Zn-1.5Mg-1.6Cu-0.2Zr), add 0% Sb (alloy AA7075) and 0.3% Sb (alloy AA7075Sb) respectively, raw materials are A00 pure aluminum, industrial Add in the form of pure magnesium, pure zinc, Al-Cu alloy, Al-Zr alloy and Al-Sb alloy. Alloy smelting is carried out in a resistance furnace, and the melt is poured into an iron mold at 720°C. The ingot was homogenized at 450°C for 24 hours, and then forged at 430°C by free forging to a forging with a thickness of 15mm, and the forging deformation in the height direction was 90%. The alloy after forging is solution treated by stepwise heating. The process is: (200°C, 24h)+(450°C, 1h)+(470°C, 1h). aging treatment.

[0016] Metallographic observations were performed on a LEICAMEF4A / M microscope. Microstructural analysis was carried out on JSM??6360 scanning electron microscope, JEM??100CX transmission electron microscope and TecnaiG220 transmission electron microscope. The thin fi...

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Abstract

In order to refine crystalline grains of AA7075 aluminum alloy and improving the mechanical property of the AA7075 aluminum alloy, the invention discloses a method for improving the overall performance of the AA7075 aluminum alloy by adding rare earth Sb. The rare earth Sb element is added to the as-cast-condition AA7075 aluminum alloy with the temperature of 720 DEG C. The rare earth Sb element accounts for, by mass, 0.3%. The AA7075 aluminum alloy is smelted through a conventional melting mode.

Description

technical field [0001] The invention relates to a method for adding rare earth Sb to improve the comprehensive performance of AA7075 aluminum alloy, and belongs to the technical field of performance optimization of AA7075 aluminum alloy. Background technique [0002] my country is very rich in rare earth resources. According to the data released by the British Roskill Information Company in 2003, my country's rare earth reserves are 27 million tons, accounting for 30.7% of the world's total reserves. How to vigorously develop and utilize such abundant rare earth resources has become a new research hotspot in my country's materials field. AA7075 aluminum alloy has high temperature strength, corrosion resistance, welding performance, casting performance, and superior cutting performance, but because it cannot be heat treated, its mechanical properties are low. Because it is mainly used to manufacture parts such as engines, rotors, blades, internal combustion engines, and petr...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C21/10
Inventor 王晓芳
Owner 王晓芳
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