期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.03.112
关键词
Magnesium alloys; Precipitation; Deformation strain; Mechanical properties
类别
资金
- National Great Theoretic Research Project [2013CB632200]
- National Natural Science Foundation of China [51474043]
- Chongqing Municipal Government Project [CSTC2013JCYJC60001]
Strain-induced dynamic precipitation of Mg17Al12 phases was observed in large strain hot rolling of Mg-8Al alloys sheets. Our results show that Mg17Al12 phase precipitates in dynamic recrystallization of grains due to severe plastic deformation and the amount of secondary particles increases with increasing deformation strain. Two types of nanoscale Mg17Al12 phases precipitated inside dynamic recrystallized grains were observed. The growth of dynamic recrystallized grains is constricted by the pinning effect of beta phase. The mechanical properties of rolled sheets are largely influenced by the increase of the deformation strain. It shows that the increase of ultimate tensile strength of rolled sheets can be segregated into two different stages, which are similar to the enhancement of dynamic recrystallization. The tendency of mechanical properties evolution of rolled sheets reveals that strain-induced precipitates have excellent hardening behavior and it can be considered as a promising way in improving mechanical properties of Mg alloys. (C) 2015 Elsevier B.V. All rights reserved.
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