Compressive deformation behavior of an indirect-extruded Mg-SSn-lAl-lZn alloy

The medium and warm deformation behaviors of an indirect-extruded Mg-8Sn-IAI-IZn alloy were investigated by compression tests at temperatures between 298 and 523 K and strain rates of 0.001-10 s-1. It was found that the twinning-slip transition temperature was strain rate dependent, and all the true...

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Bibliographic Details
Published in:矿物冶金与材料学报：英文版 2013, Vol.20 (1), p.49-56
Main Author: Wei-li Cheng Zhong-ping Que Jin-shan Zhan Chun-xiang Xu Wei Liang Bong Sun You Sung Soo Park
Format: Article
Language:English
Subjects:
低应变速率
动态再结晶
压缩
变形行为
挤压
测试温度
镁合金
间接
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Summary:The medium and warm deformation behaviors of an indirect-extruded Mg-8Sn-IAI-IZn alloy were investigated by compression tests at temperatures between 298 and 523 K and strain rates of 0.001-10 s-1. It was found that the twinning-slip transition temperature was strain rate dependent, and all the true stress-true strain curves could be divided into two groups： concave and convex curves. Associated microstructural investigations indicated that the dynamic recrystallization （DRX） be- havior of the alloy varied with deformation conditions. At high strain rate and low temperature, dynamically recrystallized grains preferentially nucleated and developed in the twinned regions, indicating that twinning-induced DRX was dominant. While, at low strain rate, DRX developed extensively at grain boundaries and twins, and the process of twinning contributed to both oriented nucleation and selective growth. For the studied alloy, cracks mainly initiated from the shear band and twinning lamellar over the ranges of temperature and strain rate currently applied.
ISSN:1674-4799
1869-103X