文献类型：期刊文献

中文题名：Microstructure and mechanical properties of friction stir processed Al?Mg2Si alloys

英文题名：搅拌摩擦加工Al?Mg2Si合金的显微组织与力学性能

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

第一作者：Qing-dong QIN

通信作者：SU, Xiang-dong|[14440b9dbf34bc85c0dd7]苏向东;[144403390b0ffee2c3a80]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

中文期刊名：Transactions of Nonferrous Metals Society of China

外文期刊名：中国有色金属学报（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2019_2020】；

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

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

外文关键词：Al?Mg2Si合金;搅拌摩擦加工;极限抗拉强度;显微组织演变;缺陷

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 10mm)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通过TEM和EBSD研究搅拌摩擦加工Al?Mg2Si合金的显微组织和力学性能变化。结果显示:随着搅拌针转速的增加(300~700 r/min),缺陷面积逐渐减小(由10.5 mm2减小到0);当转速进一步增加(700~1200 r/min),缺陷面积变化又呈相反的趋势(从0增加到1.5 mm2)。在转速的增加过程中,缺陷的类型从隧道缺陷转变为熔合缺陷。在焊核区,粗大的Mg2Si枝晶被破碎成细颗粒(<10μm)。小角度晶界的百分比由57.7%增加到83.6%,这是由形变组织迅速增加(从1.7%到13.6%)引起的。焊核区的极限抗拉强度(UTS)和伸长率均明显提高,硬度值按如下顺序增加:R300