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利用热压缩实验研究一种新型的具有优异室温塑性的Mg-4Al-2Sn-Y-Nd镁合金的高温流变行为,变形温度为200~400°C,应变速率为1.5×10-3~7.5 s-1。结果表明:合金的应变速率敏感因子(m)在不同变形温度下均明显小于AZ31镁合金的m值,因此该合金适合在高应变速率下进行热加工。在真应力-应变曲线基础上,建立Mg-4Al-2Sn-Y-Nd镁合金高温变形的本构方程,并计算得到合金的应力指数为10.33,表明合金在高温下主要的变形机制为位错攀移机制。同时,利用加工图技术确定合金的最佳高温变形加工窗口,即变形温度在350~400°C之间,应变速率在0.01~0.03 s-1。
The hot rheological behavior of Mg-4Al-2Sn-Y-Nd magnesium alloy with excellent room temperature plasticity was investigated by means of hot compression experiment. The deformation temperature was 200-400 ° C and the strain rate was 1.5 × 10-3-7.5 s-1. The results show that the strain rate sensitivity factor (m) of the alloy is obviously lower than that of AZ31 magnesium alloy at different deformation temperatures, so the alloy is suitable for hot working at high strain rate. Based on the true stress-strain curve, the constitutive equation of Mg-4Al-2Sn-Y-Nd magnesium alloy under high temperature deformation was established, and the stress index of the alloy was calculated to be 10.33, indicating that the main deformation mechanism of the alloy at high temperature is dislocation Climbing mechanism. At the same time, the best high temperature deformation processing window of the alloy is determined by using the processing diagram technology, that is, the deformation temperature is between 350 and 400 ° C and the strain rate is between 0.01 and 0.03 s-1.