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本文采用Gleeble-1500B热模拟试验机研究了铸造Mg-2.5Nd-1.0Zn-0.5Zr稀土镁合金在变形温度为200~400℃、应变速率为0.001~0.1 s~(-1),变形程度为30%条件下的高温压缩变形行为,分析了实验合金在高温变形过程中应力与应变速率和变形温度之间的关系。结果表明,Mg-2.5Nd-1.0Zn-0.5Zr镁合金热变形时,变形温度和应变速率是影响合金热变形性能的重要因素。应变速率越低,温度越高时更容易发生再结晶。提高变形温度和变形量、降低应变速率,均使动态再结晶程度增加,晶粒尺寸加大。
In this paper, the Gleeble-1500B thermal simulation test machine was used to study the deformation of Mg-2.5Nd-1.0Zn-0.5Zr rare earth magnesium alloy at deformation temperature of 200-400 ℃ and strain rate of 0.001-0.1 s -1, 30% under high temperature compression deformation behavior of the experimental alloy in the high temperature deformation process stress and strain rate and the relationship between deformation temperature. The results show that the deformation temperature and strain rate of Mg-2.5Nd-1.0Zn-0.5Zr magnesium alloy are important factors that affect the hot deformation properties of the alloy. The lower the strain rate, the more likely the recrystallization occurs at higher temperatures. Increasing the deformation temperature and deformation, reducing the strain rate, the degree of dynamic recrystallization are increased, the grain size increases.