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采用Gleeble-1500D热模拟试验机,对喷射沉积挤压态镁合金Mg-9Al-3Zn-1Mn-5Ca-3Nd在温度为300℃~400℃,应变速率为0.0 1 s-1、0.1 s-1、1 s-1时,应变量为60%的热变形行为进行了研究。分析了流变应力与温度T和应变速率的关系,计算出了应力指数n(stress exponent)和变形激活能,结果表明,应变速率及温度均对流变应力有明显影响,流变应力及其最大值都随应变速率的升高和形变温度的降低而升高。并采用Hyperbolic sine模型确定了合金n和Q随T的变化规律。
The Gleeble-1500D thermal simulator was used to simulate the spray deposition of magnesium alloy Mg-9Al-3Zn-1Mn-5Ca-3Nd at a temperature of 300-400 ℃ and a strain rate of 0.0 1 s-1, 0.1 s-1 , 1 s-1, the strain of 60% of the thermal deformation behavior were studied. The relationship between the flow stress and temperature T and strain rate was analyzed and the stress exponent and deformation activation energy were calculated. The results show that both the strain rate and the temperature have a significant effect on the flow stress, and the maximum of the flow stress and its maximum Values increase with strain rate and deformation temperature. Hyperbolic sine model was used to determine the variation of n and Q with T.