【摘要】 采用Gleeble-3500热模拟试验机,在变形温度300℃~420℃、应变速率0.000 5 s-1~0.5 s-1的变形条件下,对铸态AZ80+0.4Ce镁合金进行热压缩试验。试验研究了该合金的高温流动应力变化规律,采用金相显微镜分析了温度、应变速率对微观组织的影响。结果表明:铸态AZ80+0.4Ce镁合金的高温流动应力-应变曲线主要以动态再结晶软化机制为特征,增加变形温度和降低应变速率都会降低材料的流动应力;热压缩温度越高,动态再结晶进行越充分,应变速率越大,动态再结晶晶粒越细。更多还原

【Abstract】 The hot compression test of as-cast AZ80 + 0.4Ce magnesium alloy was conducted on a Gleeble-3500 thermo-mechanical simulator in the temperature range of 300- 420℃and the strain rate range of 0.000 5 s- 1- 0.5 s- 1.The elevated temperature flow stress of the alloy was studied and the influence of temperature and strain rate on the microstructure was analyzed by means of the optical microscopy.The results show that the high temperature flow stress-strain curve of as-cast AZ80 + 0.4Ce magnesium alloy is mainly characterized by dynamic recrystallization softening mechanism and that the flow stress of the alloy decreases with increasing temperature and decreasing strain rate.The dynamic recrystallization tends to be more complete with increasing temperature and the dynamic recrystallized grain size decreases with increasing strain rate.更多还原