摘要
利用Gleeble-1500热／力模拟试验机，研究了不同变形温度（250～350℃）和应变速率（0．01～1s^-1）条件下铸态ZK30镁合金的热压缩变形行为。结合真应力一真应变曲线特征，分析了热压缩试验过程中的变形条件对合金流变应力及其变化规律的影响。结果显示，随着变形过程中应变量的逐渐增大，受热变形条件的影响真应力一真应变曲线展现了由硬化作用主导的变形机制到动态回复或动态再结晶为特征的软化机制变化过程。在变形温度恒定不变的情况下，当应变速率由0．01s-1增大到1s-1时流变应力水平明显增大；在应变速率为一定值时，当变形温度由250％增大到3500℃时流变应力水平显著减小。
The effects of various deformation temperatures （250-350 ℃） and strain rates （0.01-1s-1） on hot compressive deformation behaviors of as-cast ZK30 magnesium alloy were investigated by Gleeble-1500 thermol simulator testing machine. Combine characteristics of the true stress-strain curves, the effect of hot de- formation conditions on flow stress were analyzed. The experimental results show that the softening mechanism of dynamic recrystallization or dynamic recovery is a feature of the true stress-strain curves of ZK30 alloy af- fected by hot deformation conditions. On the one hand, the flow stress increase with the increase of strain rate, and the true stress-true strain curves at different temperatures. On the other hand, the flow stress decrease with the increase of deformation temperature （250 to 350℃ ）, and the true stress-true strain curves at different strain rates.
出处
《信息记录材料》
2014年第2期17-20,共4页
Information Recording Materials
基金
内蒙古自治区自然科学基金重大项目(2013ZD10)资助
