文献类型：期刊文献

中文题名：搅拌摩擦加工Al?Mg2Si合金的显微组织与力学性能

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

作者：秦庆东 赵宏龙 李娟 张英哲 苏向东

第一作者：秦庆东

通信作者：Zhao, HL[1];Su, XD[1]

机构：[1]贵州理工学院贵州省轻金属材料制备技术重点实验室,贵阳550003;[2]贵州理工学院材料与能源工程学院,贵阳550003;[3]贵州省2011特种功能材料研究中心,贵阳550003

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

中文期刊名：中国有色金属学报：英文版

外文期刊名：TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA

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

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

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

摘要：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:R300The 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