The relationship between dynamic strain aging and serrated flow behaviour in magnesium alloy |
| |
| Authors: | W. H. Wang S. S. Shah J. H. Ni X. N. Zhang |
| |
| Affiliation: | 1. The Group of Magnesium Alloys and Their Applications, Institute of Metal Research Chinese Academy of Sciences, Shenyang, China;2. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China;3. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China |
| |
| Abstract: | The relationship between dynamic strain ageing (DSA) and serrated flow has been investigated via alternately switching strain rates at various temperatures in a Mg–3Nd–1Zn alloy. The results reveal that serrated flow is enhanced with decreasing strain rate and increasing temperature and tends to vanish, while the DSA continually intensifies as revealed by a higher flow stress even after the serration flow disappears. A mechanism is proposed, which could explain some abnormal deformation behaviour, such as a negative strain rate sensitivity and thermal hardening. |
| |
| Keywords: | Dynamic strain ageing deformation mechanisms magnesium alloys stress–strain diagram tensile testing |
|
|
