Effects of pre-aging and minor Sc addition on the microstructure and mechanical properties of friction stir processed 7055 Al alloy

被引：31
作者：
Liu, C. Y. [1 ,2 ]
Zhang, B. [3 ]
Ma, Z. Y. [2 ]
Teng, G. B. [1 ]
Wei, L. L. [1 ]
Zhou, W. B. [4 ]
Zhang, X. Y. [3 ]
机构：
[1] Guilin Univ Technol, Key Lab New Proc Technol Nonferrous Met & Mat, Minist Educ, Guilin 541004, Peoples R China
[2] Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China
[3] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China
[4] Alnan Aluminium Co Ltd, Nanning 530000, Peoples R China
来源：
VACUUM | 2018年 / 149卷
基金：
中国国家自然科学基金;
关键词：
Al alloy; Friction stir processing; Microstructure; Mechanical properties; MG-CU ALLOY; STRESS-CORROSION CRACKING; LOW-TEMPERATURE SUPERPLASTICITY; ALUMINUM-ALLOY; BASE-METAL; STRENGTH; STRAIN; JOINTS; ZR; PARAMETERS;
D O I：
10.1016/j.vacuum.2017.12.030
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of Sc addition and pre-aging on the microstructure and mechanical properties of friction stir processed (FSP) 7055 Al alloy were investigated. The addition of Sc effectively inhibited the coarsening of grains in the FSP 7055 Al alloy due to the grain boundary pinning effect of Al-3(Sc,Zr) particles. The high density of Al-3(Sc,Zr) particles also provided more preferential nucleation sites for the precipitation of the ri phase during FSP, and then inhibited the coarsening and increased the density of the ri phase in the FSP 7055 alloy. The re phase precipitated in the 7055 and Sc-containing 7055 during artificial aging, and then dissolved into the Al matrix during FSP. Thus, pre-aging effectively inhibited the formation of the eta phase during FSP, and increased the quantity of the solute atoms in the FSP samples. The mechanical properties of the FSP 7055 Al alloy were improved by the addition of Sc and pre-aging. The aged 7055-0.25Sc Al alloy with FSP showed the highest ultimate tensile strength of 578 MPa; and the aged 7055 Al alloy with FSP showed the largest elongation of 21%. This work provides an effective strategy to improve the mechanical properties of FSP Al alloys. (C) 2017 Elsevier Ltd. All rights reserved.
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页码：106 / 113
页数：8
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