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采用Gleeble-1500D热模拟机,对AZ31B镁合金在温度为260～420℃、应变速率为0.03、0.1、1、3s-1时,应变量为70%的塑性变形行为以及热压缩后镁合金组织的变化进行了研究。分析了流变应力与应变速率和温度的关系。结果表明:该材料在420℃及应变率0.1s-1时可发生动态再结晶,也是最优的热加工工艺参数;在260℃,应变率为0.03s-1的区域可能出现楔形裂纹;热压缩后晶粒明显得到细化,出现大量细小的等轴晶。
Using Gleeble-1500D thermal simulator, the deformation behavior of AZ31B magnesium alloy at strain of 70% and strain rate of 0.03, 0.1, 1, 3s-1 at 260-420 ℃ and hot-compressed magnesium alloy The changes were studied. The relationship between flow stress and strain rate and temperature is analyzed. The results show that the material can undergo dynamic recrystallization at 420 ℃ and strain rate of 0.1s-1, which is also an optimal thermal processing parameter. At 260 ℃, wedge-shaped cracks may occur in the strain rate of 0.03s-1. After compression, the grains are obviously refined and a large number of fine equiaxed grains appear.