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在变形温度为250~400℃和应变速率为0.01~10s~(-1)的条件下,采用Gleeble-1500D热模拟试验机对含稀土AZ31镁合金进行等温恒应变速率热压缩试验,获得了其真应力-应变曲线。确定了该合金在稳态应力下的Arrhenius流动应力模型参数,并基于动态材料模型理论(DMM)建立了其热加工图。结果表明,该合金的流动应力随应变速率的升高和温度的降低而增大。结合热加工图和显微组织演化分析,确定其适宜的热成形工艺区域有两个:0.03~0.8s~(-1),250~325℃和0.01~0.9s~(-1),350~400℃。
Under the condition of deformation temperature of 250 ~ 400 ℃ and strain rate of 0.01 ~ 10s ~ (-1), the isothermal constant strain rate thermal compression test of rare earth AZ31 magnesium alloy was carried out by Gleeble-1500D thermal simulation tester, True stress - strain curve. Arrhenius flow stress model parameters of the alloy under steady-state stress are determined, and its thermal processing diagram is established based on the dynamic material model theory (DMM). The results show that the flow stress increases with the increase of strain rate and the decrease of temperature. According to the thermal processing diagram and the microstructure evolution analysis, it is concluded that there are two suitable thermoforming zones: 0.03 ~ 0.8s ~ (-1), 250 ~ 325 ℃ and 0.01 ~ 0.9s ~ (-1) 400 ° C.