文献类型：期刊文献

英文题名：Microstructure and mechanical properties of friction stir welds on unmodified and P-modified Al-Mg2Si-Si alloys

作者：Qin, Q. D. Huang, B. W. Wu, Y. J. Su, X. D.

第一作者：秦庆东

通信作者：Qin, QD[1]|[14440b8f0a27c8b88f113]秦庆东;

机构：[1]Guizhou Inst Technol, Key Lab Light Met Mat Proc Technol Guizhou Prov, 1 Caiguan Rd, Guiyang 550003, Peoples R China;[2]Guizhou Inst Technol, Dept Mat & Met Engn, 1 Caiguan Rd, Guiyang 550003, Peoples R China;[3]2011 Special Funct Mat Collaborat Innovat Ctr Gui, 1 Caiguan Rd, 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, 1 Caiguan Rd, Guiyang 550003, Peoples R China.|贵州理工学院;

年份：2017

卷号：250

起止页码：320-329

外文期刊名：JOURNAL OF MATERIALS PROCESSING TECHNOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000410010300033)】；

基金：This work was supported by the National Natural Science Foundation of China [51564005]; the Program for the Distinguished Young Scientific Talents of Guizhou [Qian Ke He Platform and talent (2016) 5633]; the National Natural Science Foundation of Guizhou Province [(2015) 2058; (2016) 7100]; the Key Laboratory of Light Metal Materials Processing of Guizhou Province [Qian Ke He Platform and talent (2016) 5104]; and the Scientific & Technological Innovation Talent Team of Guizhou Province [Qian Ke He Talent Team (2015) 4008].

语种：英文

外文关键词：Al-Mg2Si-Si alloy; Friction stir welding; Microstructure; Mechanical properties

摘要：Welded joints formed by friction stir welding (FSW) consist of three distinct zones: a base material zone (BMZ), a thermo-mechanically affected zone (TMAZ), and a weld nugget (WN). Primary Mg2Si phases are identified as equiaxed crystals and polygonal particles in unmodified and P-modified Al-Mg2Si-Si alloys in the BMZ, respectively. In the WN, the equiaxed primary Mg2Si crystals in the unmodified alloys are transformed to significantly smaller polygonal/irregular particles; the corners of the polygonal primary Mg2Si particles in the modified alloys become smoother and smaller. The segregation of the primary Mg2Si phase is reduced for both the unmodified and modified alloys in the WN. Both unmodified and modified alloys have a lower solidus temperature in the WN. The ultimate tensile strengths (UTSs) of the welded joints are enhanced by 5% and 8% for the unmodified and modified alloys, respectively, in comparison with the parent material. The UTS of the welded joints in the modified alloy is 20% higher than in the unmodified alloy.