Journal
MATERIALIA
Volume 8, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtla.2019.100443
Keywords
Magnesium alloys; Superplasticity; Bimodal grain structure; Continuous dynamic recrystallization; Grain boundary sliding
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Funding
- National Key Research and Development Program [2016YFB0301103]
- Natural Science Foundation of China [51625402, 51871108, 51922048, 51671093]
- Changjiang Scholars Program [T2017035]
- Science and Technology Development Program of Jilin Province [20190103003JH]
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Superplasticity is usually obtained in uniform fine-grained materials processed by severe plastic deformation or multi-pass controlled rolling. However, we highlight a superplastic bimodal grain-structured Mg-9Al-1Zn (AZ91) alloy processed by hard-plate rolling (HPR). The present bimodal grain-structured alloy exhibits a notable elongation of similar to 580% upon tension at 573 K and 1 x 10(-3) s(-1). The superplasticity is accommodated by the cooperative process of continuous dynamic recrystallization (CDRX) within coarse grains and grain boundary sliding (GBS) in fine-grained regions at early tension stage, followed by GBS controlled by grain boundary (GB) self-diffusion being the dominant deformation mode at late stage.
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