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通过高温拉伸试验,研究了AZ31B镁合金板材在250~450℃以及应变速率0.001 s-1、0.01 s-1条件下的高温变形行为,获得了材料的厚向异性系数、伸长率等成形性能参数及有关组织特征。结果表明,不同变形条件下AZ31B合金的真应力-真应变曲线均出现峰值,峰值应力随变形温度的升高和应变速率的降低而减小;硬化速率随变形温度的升高而降低,在温度高于250℃时变化不大。当变形温度为250℃,应变速率为0.001 s-1时,合金的厚向异性系数达到最大。随变形温度的升高,AZ31B镁合金的塑性显著提高。合金的动态再结晶温度为250℃,随着应变速率增大,合金发生动态再结晶的速度加快。
The high temperature deformation behavior of AZ31B magnesium alloy sheet at 250-450 ℃ and strain rate of 0.001 s-1, 0.01 s-1 was studied by high temperature tensile test. The thickness anisotropy coefficient and elongation of the AZ31B magnesium alloy sheet were obtained. Performance parameters and related organizational characteristics. The results show that the true stress - true strain curves of AZ31B alloy all show the peak values under different deformation conditions, and the peak stress decreases with the increase of deformation temperature and strain rate. The hardening rate decreases with the increase of deformation temperature. Above 250 ℃ little change. When the deformation temperature is 250 ℃ and the strain rate is 0.001 s-1, the maximum anisotropy coefficient of the alloy reaches its maximum. With the deformation temperature increases, AZ31B magnesium alloy plastic significantly increased. The dynamic recrystallization temperature of the alloy is 250 ℃. With the increase of the strain rate, the dynamic recrystallization of the alloy accelerates.