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乔柯,王快社,王文,李天麒,王强.搅拌摩擦加工AZ31镁合金低周疲劳性能研究[J].稀有金属材料与工程(英文),2019,47(3):788~796.[Ke Qiao,Kuaishe Wang,Wen Wang,Tianqi Li and Qiang Wang.Low-cycle fatigue properties of friction stir welded joint of AZ31 magnesium alloy[J].Rare Metal Materials and Engineering,2019,47(3):788~796.]
Low-cycle fatigue properties of friction stir welded joint of AZ31 magnesium alloy
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Received:November 13, 2018  Revised:December 25, 2018
Key words: Friction stir welded  magnesium alloy  texture  low-cycle fatigue  fracture
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Ke Qiao,Kuaishe Wang,Wen Wang,Tianqi Li and Qiang Wang  
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      Friction stir welding (FSW) has been validated to be a severe plastic deformation method for development of ultrafine-grained metals. In this study, hot-rolled AZ31 magnesium alloy plate was processed by FSW, and the effect of FSW on the low-cycle fatigue (LCF) behavior of AZ31 magnesium alloy was analyzed. Results showed that the interface between the stir zone and thermo-mechanically affected zone at the advancing side is the weakest region, in which the monotonic tensile and fatigue fracture occur. Compared with the base metal (BM), the LCF fatigue life, the yield strength, the ultimate tensile strength and the elongation of FSW specimen decrease. The main deformation during LCF was dislocation slip deformation. The fracture surface exhibited a typical fatigue characteristic with the fatigue striations. Finally, we found that the LCF behavior of BM and FSW specimens can be well described by the Coffin-Manson and Basquin’s relations.