文献类型：期刊文献

英文题名：Microstructures and mechanical properties of TIG welded Al-Mg2Si alloy joints

作者：Qin, Qingdong Zhao, Honglong Li, Juan Zhang, Yingzhe Zhang, Bangrui Su, Xiangdong

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, Dept Mat & Met 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：56

起止页码：941-949

外文期刊名：JOURNAL OF MANUFACTURING PROCESSES

收录：;EI(收录号：20202308799171);Scopus(收录号：2-s2.0-85085917834);WOS:【SCI-EXPANDED(收录号:WOS:000558320500008)】；

基金：This work was supported by the National Natural Science Foundation of China [51964011], the Program for the Distinguished Young Scientific Talents of Guizhou, China [Qian Ke He Platform and talent (2017) 5633], the Natural Science Foundation of Guizhou Province (Qian Ke He J[2017]1071) and the Guizhou Provincial Higher Education Engineering Research Center, China [Qian Jiao He KY (2017) 021].

语种：英文

外文关键词：Microstructure; Al-Mg2Si alloy; TIG welding; Mechanical properties

摘要：In this paper, the microstructures and mechanical properties of tungsten inert gas (TIG) welded joints were studied. Three zones were formed in these joints: a heat-affected zone (HAZ), a partial melting zone (PMZ) and a fusion zone (FZ). In the FZ, the microstructure consisted of only alpha-Al and eutectic Mg2Si. The alpha-Al segregation phenomenon occurred when the welding current increased from 125 A to 135 A. The low-angle grain boundaries (LABs) found in the base material (BM) transformed into high-angle grain boundaries (HABs) in the FZ. The texture of the BM was concentrated in three specific preferred orientations, whereas the texture was eliminated in the FZ. The hardness in the FZ was 45 % higher than that in the BM. The eutectic Mg2Si phase in the welded joints became fine and dense, and the needle-like beta '' phase in the BM was replaced by a high density of fine precipitates, which led to an increase in hardness. The ultimate tensile strength (UTS) and elongation of the joints welded at 125 A were lower than those of the BM and the joints welded at 135 A. Furthermore, no cracks were generated in the joints after multiple thermal shocks.