目的：研究变形温度及变形速率对镁合金 AZ40M 再结晶晶粒尺寸以及硬度的影响。方法在 gleeble-1500D 热模拟机上进行热物理模拟压缩实验,变形温度为250~400℃,变形速率为0.001~1 s-1,通过金相法观测 AZ40M 镁合金在不同变形条件下的组织形貌,采用维氏硬度计测出镁合金热变形后的硬度值。结果当升高变形温度或降低变形速率时,材料的晶粒尺寸增大且硬度减小。结论得出了再结晶晶粒尺寸的变化规律,建立了 AZ40M 镁合金的晶粒尺寸与硬度的关系模型。%Objective To study the effects of experimental temperatures and strain rates on the recrystallized grain size and hardness of the AZ40M alloy. Methods The hot compression experiments were carried out on the gleeble-1500 thermal simulation machine. The experimental temperatures and strain rates were investigated in the temperature range of 250 and 400 ℃ and the strain rate range of 0. 01 and 1 s-1 . Metallographic observation was used to analyze the microstructure mor-phology of AZ40M alloy under different deformation conditions, and the hardness values of magnesium alloy after hot de-formation were measured using Vivtorinox hardness meter. Results The recrystallized grain size increased significantly and the hardness decrease significantly at higher deformation temperature or lower strain rate. Conclusion The variation rule of recrystallized grain size was obtained. The relation model of recrystallized grain size and hardness was built for AZ40M alloy.
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