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采用分步机械合金化方法进行了细晶AZ31镁合金的制备,进行了显微组织和物相组成的分析,并与常规AZ31进行了疲劳性能和不同温度下力学性能的测试与对比分析。结果表明,分步机械合金化方法 ,可制备出平均晶粒尺寸为4.8μm、具有优异力学性能和疲劳性能的细晶AZ31镁合金。与常规AZ31相比,分步机械合金化制备的细晶AZ31的抗拉强度和伸长率和疲劳性能都得到提高,其中室温抗拉强度增加34 MPa,室温伸长率增加6.2%,疲劳寿命增加122.13%。
The microstructure and phase composition of the as-prepared AZ31 magnesium alloy were investigated by a step-by-step mechanical alloying method. The fatigue properties and the mechanical properties at different temperatures were tested and compared with the conventional AZ31. The results show that the fine-grained AZ31 magnesium alloy with average grain size of 4.8μm and excellent mechanical properties and fatigue properties can be prepared by stepwise mechanical alloying. Compared with the conventional AZ31, the tensile strength, elongation and fatigue properties of the fine grained AZ31 prepared by the stepwise mechanical alloying are improved, room temperature tensile strength increased 34 MPa, room temperature elongation increased 6.2%, fatigue life increased 122.13%.