Effect of microstructure and microtexture on mechanical properties and fracture behaviour of friction stir-welded AZ31/AZ61 joint

被引：7
作者：
Yu, Zhe [1 ]
Sheng, Guangmin [1 ]
Li, Ting [1 ]
机构：
[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing, Peoples R China
来源：
MATERIALS RESEARCH EXPRESS | 2018年 / 5卷 / 12期
关键词：
AZ31/AZ61; joint; friction stir welding; yield strength; ultimate tensile strength; fracture; (0001) plane; DISSIMILAR MG ALLOYS; MAGNESIUM ALLOY; PARAMETERS; SHEETS;
D O I：
10.1088/2053-1591/aadbec
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Defect-free AZ31/AZ61 joint was obtained by friction stir welding. The surface characteristics, yield strength, ultimate tensile strength, grain size, microtexture, and dislocation density were characterized by experimental observations. Under low heat input, fine equiaxed grains with an average grain size of 3.5 mu m were observed in the stir zone (SZ) of the AZ31/AZ61 joint. The grains formed through dynamic recrystallization. Second-phase particles observed in this region were small. The ultimate tensile strength of the AZ31/AZ61 weld seam reached 96.1% of that of the AZ31 base metal (BM). The yield strength of the joint exceeded that of the AZ31 BM due to the second-phase particle and fine-grain strengthening. The fracture was located on the AZ31-SZ-side with a (0001) plane at an angle of 45 degrees to the tensile direction.
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页数：8
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