Microstructure and mechanical properties of friction stir processed Al−Mg2Si alloys

被引：0
作者：
QIN Q.-D. [1 ]
ZHAO H.-L. [1 ]
LI J. [2 ]
ZHANG Y.-Z. [3 ]
SU X.-D. [1 ]
机构：
[1] Key Laboratory of Light Metal Materials Processing Technology of Guizhou Province, Guizhou Institute of Technology, Guiyang
[2] School of Materials and Energy Engineering, Guizhou Institute of Technology, Guiyang
[3] 2011 Special Functional Materials Collaborative Innovation Center of Guizhou Province, Guiyang
来源：
SU, Xiang-dong (20150696@git.edu.cn); ZHAO, Hong-long (20140441@git.edu.cn) | 1600年 / Nonferrous Metals Society of China, B12 Fuxing Road, Beijing, 100814, China卷 / 30期
基金：
中国国家自然科学基金;
关键词：
Al−Mg[!sub]2[!/sub]Si alloy; defect; friction stir processing; microstructural evolution; ultimate tensile strength;
D O I：
10.1016/S1003-6326(20)65384-5
中图分类号：
学科分类号：
摘要：
The microstructure and mechanical properties of friction stir processed Al−Mg2Si alloys were studied by TEM and EBSD. The results showed that an increase in the tool rotation speed (300−700 r/min) led to a decrease in the defect area (from 10.5 mm2 to zero), whereas the defect area demonstrated the opposite trend (increased to 1.5 mm2 from zero) upon further increasing the rotation speed (700−1200 r/min). The types of defects were transformed from tunnel defects to fusion defects as the rotational speed increased. The coarse Mg2Si dendrites were broken and fine particles (smaller than 10 μm) formed in the weld nugget (WN). The amount of low-angle grain boundaries increased significantly from 57.7% to 83.6%, which was caused by an increase in the content of the deformed structure (from 1.7% to 13.6%). The hardness, ultimate tensile strength (UTS) and elongation were all greatly improved for the weld nugget. The hardness values of the WNs had the following order: R300<R1200<R500<R900<R700. The UTS and elongation had the following order: BM (base material)<R300<R1200<R500<R900<R700. The UTS and the elongation for the WN were increased by one and three times, respectively. © 2020 The Nonferrous Metals Society of China
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页码：2355 / 2368
页数：13
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