Microstructure and mechanical properties of 7005 aluminum alloy processed by room temperature ECAP and subsequent annealing

被引:70
作者
Duan, Yulu [1 ]
Tang, Lei [1 ]
Xu, Guofu [1 ,2 ]
Deng, Ying [1 ,2 ]
Yin, Zhimin [1 ,2 ]
机构
[1] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[2] Cent South Univ, Key Lab Nonferrous Mat Sci & Engn, Minist Educ, Changsha 410083, Hunan, Peoples R China
关键词
7005 aluminum alloy; Equal channel angular pressing; Microstructural evolution; Mechanical properties; SEVERE PLASTIC-DEFORMATION; CHANNEL ANGULAR EXTRUSION; MG-SC ALLOY; GRAIN-REFINEMENT; AL-ALLOY; EVOLUTION; 7475-ALUMINUM-ALLOY; BEHAVIOR;
D O I
10.1016/j.jallcom.2016.01.022
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A coarse-grained microstructure of the extruded 7005 aluminum alloy was processed by equal channel angular pressing (ECAP) via route BC at room temperature. Microstructural evolution of the alloy processed by ECAP with different passes and subsequent annealing treatment were analyzed by using optical microscope, transmission electron microscope and electron backscatter diffraction. The results revealed that grains were refined gradually, and the low angle boundaries were progressively transformed to high angle boundaries by an increasing ECAP passes. After 7 ECAP passes, the average grain size decreased to similar to 0.87 mu m, and the fraction of high angle boundaries increased to similar to 65.5%. Furthermore, the results of tensile testing indicated that the yield strength was remarkably increased from similar to 170 MPa before ECAP to similar to 389 MPa after 7 ECAP passes, and the corresponding tensile strength increased to similar to 400 MPa after 7 ECAP passes, maintaining an appropriate elongation of similar to 13%. After annealing treatment at 150 degrees C for 1 h, the samples processed by 7 ECAP passes obtained large elongation of similar to 16%, and still maintained a high yield strength of similar to 337 MPa and tensile strength of similar to 350 MPa, which may be attributed to the recovery effects. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:518 / 529
页数:12
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