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通过在温度为250~450°C和应变速率为0.001~10 s-1条件下进行压缩测试,研究挤压态ZK60A镁合金的高温变形行为和加工性能。ZK60A镁合金的本构方程可以用双曲正弦函数进行描述。在真应变为-0.2~-0.8下构建热加工图。在300~400°C以及0.01~0.001 s-1应变速率下,材料完全再结晶(DRX)并显示出良好的加工性能。ZK60A镁合金高温加工,例如锻造,可以进行。在变形量大于-0.5以及应变速率高于0.1 s-1时,实验观察到流变失稳现象,例如局部应变集中、孪生变形、晶粒异常长大、微裂纹和切变断裂,不推荐进行加工。攀移控制的位错蠕变主导ZK60A镁合金的塑性变形以及动态再结晶形核。
The high temperature deformation behavior and processability of the as-extruded ZK60A magnesium alloy were studied by compressing at a temperature of 250-450 ° C and a strain rate of 0.001-10 s-1. The constitutive equation of ZK60A magnesium alloy can be described by hyperbolic sine function. In the true strain of -0.2 ~ -0.8 build thermal processing under the map. At 300-400 ° C and strain rates of 0.01-0.001 s-1, the material is fully recrystallized (DRX) and shows good processability. ZK60A magnesium alloy processing, such as forging, can be carried out. Rheological instability experiments such as local strain concentration, twin deformation, abnormal grain growth, microcracks and shear failure were not observed when the deformation was greater than -0.5 and the strain rate was higher than 0.1 s-1 Processing. Climbing controlled dislocation creep dominant ZK60A magnesium alloy plastic deformation and dynamic recrystallization nucleation.