Effect of friction stir processing on the kinetics of superplastic deformation in an Al-Mg-Zr alloy
Metallurgical and Materials Transactions A(2005)
摘要
The effect of friction stir processing on the superplastic behavior of extruded Al-4Mg-1Zr was examined at 350 °C to 600 °C and at initial strain rates of 1×10 −3 to 1 s −1 . A combination of a fine grain size of 1.5 μ m and high-angle grain boundaries in the friction stir-processed (FSP) alloy led to considerably enhanced superplastic ductility, much-reduced flow stress, and a shift to a higher optimum strain rate and lower optimum temperature. The as-extruded alloy exhibited the highest superplastic ductility of 1015 pct at 580 °C and an initial strain rate of 1×10 −2 s −1 , whereas a maximum elongation of 1280 pct was obtained at 525 °C and an initial strain rate of 1×10 −1 s −1 for the FSP alloy. The FSP alloy exhibited enhanced superplastic deformation kinetics compared to that predicted by the constitutive relationship for superplasticity in fine-grained aluminum alloys. A possible origin for enhanced superplastic deformation kinetics in the FSP condition is proposed.
更多查看译文
关键词
Material Transaction,Friction Stir Welding,Superplastic Deformation,Initial Strain Rate,Superplastic Ductility
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要