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在不同温度下对AZ31镁合金挤压型材实施了搅拌摩擦加工实验,利用光学显微镜和试样拉伸设备,研究了温度及搅拌摩擦加工对试样加工硬化率及力学性能的影响。研究表明:随着温度升高,母材和搅拌区材料的屈服强度和抗拉强度均减小,母材强度减小的较多;搅拌区材料的总伸长率和均匀伸长率均高于母材,温度达到100℃时,均达到最大值,分别为35%和33.5%;搅拌区材料室温及100℃的加工硬化率在较高应变量时仍能保持一定水平,而母材所有温度下的加工硬化率均随应变增大而大幅下降;母材的拉伸应变由非基面滑移和压缩孪晶主导,而搅拌区材料拉伸应变则转为由基面滑移和拉伸孪晶主导。
At different temperatures, the AZ31 magnesium alloy extrusion profiles were subjected to friction stir processing experiments. The effects of temperature and friction stir processing on the work hardening rate and mechanical properties of the AZ31 magnesium alloy profiles were studied by optical microscopy and sample stretching equipment. The results show that as the temperature increases, the yield strength and tensile strength of the base material and the mixing zone decrease, while the strength of the base material decreases more. The total elongation and uniform elongation of the material in the mixing zone are both high In the base metal, the temperature reached 100 ℃, reached the maximum, respectively 35% and 33.5%; mixing room temperature and 100 ℃ at room temperature, the work hardening rate at higher strain levels can still maintain a certain level, while the base metal The work hardening rate at temperature decreases sharply with the increase of strain. The tensile strain of base metal is dominated by non-base slip and compression twins, while the tensile strain of material in stir zone changes from slip and pull Stretch twins dominated.