文献类型：期刊文献

英文题名：Microstructure and mechanical properties of friction stir processed AlMg2Si alloys

作者：QIN, Qing-dong ZHAO, Hong-long LI, Juan ZHANG, Ying-zhe SU, Xiang-dong

第一作者：秦庆东

通信作者：SU, Xiang-dong|[144400e1521a1057a5d03]苏向东;

机构：[1] Key Laboratory of Light Metal Materials Processing Technology of Guizhou Province, Guizhou Institute of Technology, Guiyang, 550003, China; [2] School of Materials and Energy Engineering, Guizhou Institute of Technology, Guiyang, 550003, China; [3] 2011 Special Functional Materials Collaborative Innovation Center of Guizhou Province, Guiyang, 550003, China

第一机构：贵州理工学院材料与冶金工程学院

通信机构：Key Laboratory of Light Metal Materials Processing Technology of Guizhou Province, Guizhou Institute of Technology, Guiyang, 550003, China;Key Laboratory of Light Metal Materials Processing Technology of Guizhou Province, Guizhou Institute of Technology, Guiyang, 550003, China|贵州理工学院材料与冶金工程学院;贵州理工学院;

年份：2020

卷号：30

期号：9

起止页码：2355-2368

外文期刊名：Transactions of Nonferrous Metals Society of China (English Edition)

收录：EI(收录号：20204109306817);Scopus(收录号：2-s2.0-85091905270)

语种：英文

外文关键词：Microstructural evolution - Grain boundaries - Tensile strength - Friction stir welding - Hardness - Silicon - Silicon alloys - Welds - Elongation - Magnesium alloys

摘要：The microstructure and mechanical properties of friction stir processed AlMg2Si alloys were studied by TEM and EBSD. The results showed that an increase in the tool rotation speed (300700 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 (7001200 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 ? 2020 The Nonferrous Metals Society of China