The synergy effect of fine and coarse grains on enhanced ductility of bimodal-structured Mg alloys

The synergy effect of fine and coarse grains on enhanced ductility of bimodal-structured Mg alloys
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细晶粒和粗晶粒对双峰结构镁合金塑性增强的协同作用

DOI:
10.1016/j.jallcom.2018.11.229
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发表时间:
2019-04
影响因子:
6.2
通讯作者:
Qi-chuan Jiang
Qi-chuan Jiang
中科院分区:
材料科学2区
文献类型:
--
作者:
Hang Zhang;Hui-yuan Wang;Jin-guo Wang;Jian Rong;Min Zha;Cheng Wang;Pin-kui Ma;Qi-chuan Jiang

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采用硬板轧制(HPR)工艺制备了一种具有双峰结构的新型Mg-8Al-2Sn-1 Zn合金,该合金比常规轧制细晶Mg-8Al-2Sn-1 Zn合金具有更高的拉伸强度和塑性。通过电子背散射衍射(EBSD)分析发现,细小的晶粒和弱的基面织构有利于基面滑移,有利于初始变形。同时,具有强基面织构的粗晶可以容纳大量新产生的位错,促进细晶被位错饱和后的加工硬化。首次阐明了细晶和粗晶在提高双峰结构镁合金塑性方面的各自作用及其协同效应。
A novel Mg-8Al-2Sn-1Zn alloy with a bimodal structure prepared by hard-pate-rolling (HPR) exhibits both higher tensile strength and ductility than its fine-grained counterparts prepared by conventional rolling. By delicate electron back-scatter diffraction (EBSD) analysis, we found fine grains with weak basal texture is beneficial for basal slip and favors initial deformation. Meanwhile, coarse grains with a strong basal texture could accommodate abundant newly generated dislocations, promoting work hardening after fine grains are saturated with dislocations. For the first time, individual roles of fine and coarse grains and their synergy effect on enhancing ductility in bimodal structured Mg alloys is clarified.
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