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对AZ31镁合金挤压型材实施了搅拌摩擦加工(Friction Stir Processing·FSP),利用光学显微镜和拉伸试验机研究了搅拌摩擦加工对试样加工硬化率及力学性能的影响。结果表明,AZ31镁合金经搅拌摩擦加工后,晶粒得到细化,均匀伸长率和总伸长率相近,室温伸长率达22%;拉伸应变超过0.03时,搅拌区材料的加工硬化率超过母材,此时搅拌区和母材的显微组织中均出现变形孪晶,不同的是搅拌区材料的变形孪晶整体呈带状分布,且加工硬化率也较高。
The friction stir processing (Friction Stir Processing · FSP) of AZ31 magnesium alloy extrusion was carried out. The effects of friction stir processing on the work hardening rate and mechanical properties of the AZ31 magnesium alloy extrusion were investigated by optical microscope and tensile testing machine. The results show that the grains of AZ31 magnesium alloy are refined by friction stir processing, the uniform elongation and total elongation are similar, and the elongation at room temperature reaches 22%. When the tensile strain exceeds 0.03, the work hardening of the material in the mixing zone Rate than the base metal, the stirring zone and the base metal microstructure deformation twins are present, the difference is that the deformation of the stirring zone material twins overall ribbon shape, and the processing hardening rate is also higher.