期刊论文

Pan, Q.-L.(pql@mail.csu.edu.cn)

中文

材料工程

1001-4381

2010

2

25-28+32

10.3969/j.issn.1001-4381.2010.02.007

基金项目：国家高技术研究发展计划资助项目（2006AA032523）

本校为其他机构

在Gleeble 1500试验机上, 对温度范围为380~470℃和应变速率范围为0.001~10s~(-1)的一种新型含Sc的超高强铝合金的流变行为进行研究, 并用金相观察和透射电镜分析考察压缩变形时的组织演变。结果显示, 真应力-真应变曲线在小应变条件下(ε>0.15)表现出峰值应力及随后的动态流变特征, 这种关系可以用Zener-Hollomon指数方程来描述。指数方程中的平均热变形激活能Q为157.9kJ/mol。变形试样中的亚结构由拉长后晶粒中的少量细小的等轴多边形亚晶粒和晶界上的锯齿状组织构成。动态流变主要是由动态回复(DRV)和动态再结晶(DRX)引起。

The flow behavior of a new ultra-high strength aluminum alloy containing Sc was investigated with compression tests in temperature range 380-470°C and strain rate range 0.001-10s-1 using Gleeble1500 system, and the associated microstructural evolutions were studied by way of OM and TEM. The results showed that the true stress-true strain curves exhibit a peak stress followed by a dynamic flow softening at small strains(Ε<0.15), which can be represented by a Zener-Hollomon exponential equation with the hot deformation activation energy Q of 157.9kJ/mol. The substructure in the de...