AZ80镁合金热模拟压缩变形的实验研究

采用Gleeble-1500D热模拟实验机,对AZ80镁合金在250℃～450℃之间,应变速率为0.001s-1、0.01s-1、0.1s-1、1s-1、5s-1进行热模拟压缩变形,对试样宏观形貌与变形温度和应变速率进行了分析,分析了流变应力与应变速度和温度的关系,结果表明:AZ80镁合金的压缩热变形属于动态再结晶型,镁合金的变形抗力随着变形温度的上升而减小,塑性随着变形温度的增加而有所提高。随变形温度的升高和应变速率的减小,流变应力峰值向应变减小的方向移动,同一变形速率下,变形温度越高所对应的应力值越低。

Research on the Thermal Simulation Experiment of Compress Deformation of AZ80 Magnesium Alloy

By using the Gleeble-1500D simulation machine to compress the AZ80 magnesium alloy in order to produce simulation distortion during the temperature 250℃-450℃, the strain rate is 0.001s^-1、0.01s^-1、0.1s^-1、1s^-1、5s^-1 . Analyzing the macroscopical shape,strain temperature and the strain rate of sample, analyzing the relation between flow stress and strain temperature or the strain rate. The result indicates that the compressing deformation of AZ80 magnesium alloy is dynamic recrystallization. The deformation is minishing and the plastic is rising with the temperature rising. The peak value of flow stress is shifting to the direction where the strain minished with the rising of temperature and the minishing of strain rate. At the same strain rate the temperature goes higher with the corresponding strain become lower.