[基础科学]热处理对大截面7A04铝合金棒材力学性能的影响.pdf

21 5 Vol.21 No.5 2 0 0 7 10 CHINESE JOURNAL OF MATERIALS RESEARCH October 2 0 0 7 7A04 ∗ 1,2 1 1 1,2 1. 410083 2. Æ Æ 422000 7A04 . , 60 mm 7A04 200 , 620–640 MPa, Æ; 3%NaCl+0.5%H2 O2 375 MPa 30 d, 575 MPa, Æ, 19 d. 60 mm 7A04 Æ, , T6 , . , 7A04 , , , TG146 1005-3093(2007)05-0511-06 Effect of different heat-treatment on the mechanical properties of 7A04 alloy with large cross section NING Ailin1,2∗∗ LIU Zhiyi1 FENG Chun1 ZENG Sumin1,2 1.School of Material Science and Engineering, Central South University, Changsha 410083 2.Department of Mechanical Engineering,Shaoyang University, Shaoyang 422000 * Supported by the National High Technology Research and Development Program of China (863 Pro- gram) No.2001AA332030, and Key Project of Science and Technology Department of Hunan Province No.05GK2018. Manuscript received October 31, 2006; in revised form April 3, 2007. ** To whom correspondence should be addresssed, Tel:(0731)8836927, E–mail:zmm1958@163.com ABSTRACT The effect of retrogression heating on the mechanical properties of 7A04 alloy with large cross section was investigated. The results showed that when retrogressed by electrical current heating at 200 the tensile strength in re-aged 7A04 alloy extrusion bar of 60 mm in diameter reached 620– 640 MPa and a uniform elongation appeared from central part to surface layer of the sample while the fracture time in test of resistance to stress corrosion