文献类型：期刊文献

英文题名：Microstructure and mechanical properties of friction stir processed Al-Mg₂Si 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：Zhao, HL[1];Su, XD[1]

机构：[1]Guizhou Inst Technol, Key Lab Light Met Mat Proc Technol Guizhou Prov, Guiyang 550003, Peoples R China;[2]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550003, Peoples R China;[3]2011 Special Funct Mat Collaborat Innovat Ctr Gui, Guiyang 550003, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Guizhou Inst Technol, Key Lab Light Met Mat Proc Technol Guizhou Prov, Guiyang 550003, Peoples R China.|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

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000577082900005)】；

基金：Project (51594011) supported by the National Natural Science Foundation of China; Project ((2017)5633) supported by the Program for the Distinguished Young Scientific Talents of Guizhou, China; Project ((2017)021) supported by the Guizhou Provincial Higher Education Engineering Research Center, China

语种：英文

外文关键词：Al-Mg2Si alloy; friction stir processing; ultimate tensile strength; microstructural evolution; defect

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 mm(2) to zero), whereas the defect area demonstrated the opposite trend (increased to 1.5 mm(2) 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 mu m) 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