Effects of Multiple Plastic Deformations on Microstruc-ture and Mechanical Properties of 7A04-T6  

作　　者：Zhang Zhimin1,2, Yu Jianmin1, Wang Qiang2, Zhang Xing 2 1 Engineering Research Center of Magnesium-base Material Processing Technology, Ministry of Education, Taiyuan 030051, China 2 North University of China, Taiyuan 030051, China 

出　　处：《稀有金属材料与工程》2011年第S3期69-72,共4页Rare Metal Materials and Engineering

基　　金：National Defense Foundation Scientific Research (B332006031-1);Youth Foundation of Shanxi Province (2008021030);Natural Science Foundation of Shanxi Province (2009011028-1)

摘　　要：The influences of multiple plastic deformations on microstructure and mechanical properties of 7A04-T6 alloy by isothermal compression experiments in different passes deformation on the 6300 kN extrusion press. The experimental results showed that the strength and elongation of 7A04-T6 alloy were increased firstly and then decreased as the deformation pass increases at above 400 ℃. The grains of 7A04-T6 alloy was refined firstly and then grow, the grain was become refinement after four deformations under this experimental conditions. The second phase η (MgZn2) in the matrix would precipitate after solution, precipitation strengthening taking place. It is obvious that the number of second phase which dissolve into the matrix will increase as the deformation pass increasing. So the tensile strength reached the highest after four deformations, is 590.9 MPa, yield strength is 532.5 MPa, and elongation is 12.4%. After four deformations of 7A04-T6 alloy, tensile fracture surface of samples was composed of the deep and uniform dimples, belonging to ductile fracture. Therefore, 7A04-T6 alloy has better comprehensive mechanical properties after four deformations.The influences of multiple plastic deformations on microstructure and mechanical properties of 7A04-T6 alloy by isothermal compression experiments in different passes deformation on the 6300 kN extrusion press. The experimental results showed that the strength and elongation of 7A04-T6 alloy were increased firstly and then decreased as the deformation pass increases at above 400 ℃. The grains of 7A04-T6 alloy was refined firstly and then grow, the grain was become refinement after four deformations under this experimental conditions. The second phase η (MgZn2) in the matrix would precipitate after solution, precipitation strengthening taking place. It is obvious that the number of second phase which dissolve into the matrix will increase as the deformation pass increasing. So the tensile strength reached the highest after four deformations, is 590.9 MPa, yield strength is 532.5 MPa, and elongation is 12.4%. After four deformations of 7A04-T6 alloy, tensile fracture surface of samples was composed of the deep and uniform dimples, belonging to ductile fracture. Therefore, 7A04-T6 alloy has better comprehensive mechanical properties after four deformations.

关 键 词：7A04 HIGH-STRENGTH ALUMINUM alloy MULTIPLE deformations T6 heat treatment 

分 类 号：TG146.21[一般工业技术—材料科学与工程]