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在变形温度300~450℃,应变速率0.005~1 s-1条件下,采用Gleeble-1500D热/力模拟试验机对AZ41M镁合金进行热压缩实验;结合微观组织,分析了变形温度、应变速率等对流变应力的影响;基于双曲正弦关系建立了流变应力本构方程,并对本构方程进行验证。结果表明,该镁合金为温度及应变速率敏感型材料,且其流变曲线具有明显的动态再结晶特征;压缩过程中AZ41M镁合金峰值应力随变形温度升高而减小,随应变速率升高而增大;实验条件下,由所建立的本构方程计算出的峰值应力与实验值基本吻合,绝对值最大平均相对误差仅为2.666%。
Under the conditions of deformation temperature of 300 ~ 450 ℃ and strain rate of 0.005 ~ 1 s-1, the hot compression experiment of AZ41M magnesium alloy was carried out by Gleeble-1500D thermal / mechanical simulation test machine. The deformation temperature and strain rate Convection stress. Based on the hyperbolic sine relation, the constitutive equation of flow stress was established and the constitutive equation was verified. The results show that the magnesium alloy is sensitive to temperature and strain rate, and its rheological curve has obvious dynamic recrystallization characteristics. The peak stress of AZ41M magnesium alloy decreases with the increase of deformation temperature during compression, and increases with the strain rate But under the experimental conditions, the peak stress calculated by the established constitutive equation basically agrees with the experimental value, and the maximum relative error of the absolute value is only 2.666%.