1. The relationship between dynamic strain aging and serrated flow behaviour in magnesium alloy
- Author
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W. H. Wang, X. N. Zhang, R. S. Chen, D. Wu, J. H. Ni, and S.S.A. Shah
- Subjects
010302 applied physics ,Materials science ,Metallurgy ,Stress–strain curve ,Portevin–Le Chatelier effect ,02 engineering and technology ,Strain rate ,Flow stress ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Serration ,Deformation mechanism ,0103 physical sciences ,Hardening (metallurgy) ,Composite material ,0210 nano-technology ,Dynamic strain aging - 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.
- Published
- 2017