材料科学技术(英文版)2021，Vol.66Issue(7) ：28-35.

Atomic-resolution studies on reactions between basal dislocations and { 10(1)2 } coherent twin boundaries in a Mg alloy

Huhu Su Xinzhe Zhou Shijian Zheng Hengqiang Ye Zhiqing Yang
材料科学技术(英文版)2021，Vol.66Issue(7) ：28-35.
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Atomic-resolution studies on reactions between basal dislocations and { 10(1)2 } coherent twin boundaries in a Mg alloy

Huhu Su 1Xinzhe Zhou 1Shijian Zheng 2Hengqiang Ye 3Zhiqing Yang1
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作者信息

  • 1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China
  • 2. State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin, 300130, China
  • 3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China;Jihua Laboratory, Foshan, 528251, China
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Abstract

Reactions between basal <a60> dislocations and { 10(1)2 } coherent twin boundaries (CTBs) in a Mg alloy were studied with atomic resolution.Individual dislocation-CTB reactions produced steps with residual dislocations and multiple twinning dislocations (TDs) gliding away,consequently resulting in TB migration.Reactions between {10(1)2} CTBs and low-angle grain boundaries composed of basal<a60> dislocations created either basal-prismatic/prismatic-basal interfaces or asymmetric tilt grain boundaries,depending on whether TDs gliding away or not.Not only the emission of TDs by dislocation-TB reactions may drive TB migration,but also the resultant steps or facets along TBs can act as TD sources to facilitate TB migration.Our results indicate that roughness or severe loss of local coherency induced by dislocation-TB reactions does not intrinsically impede TB migration in Mg alloys.Dislocation-TB reactions may provide another feasible strategy to improve the ductility of Mg alloys,in addition to other techniques like grain refinement and texture modification.

Key words

Mg alloys/Dislocation/Twin boundary/Migration/Plastic deformation

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基金项目

authors thank Dr.Di Wu and Dr.Rongshi Chen for help in multi-directional forging.This work was supported by the National Nat(51971225)

authors thank Dr.Di Wu and Dr.Rongshi Chen for help in multi-directional forging.This work was supported by the National Nat(51771202)

authors thank Dr.Di Wu and Dr.Rongshi Chen for help in multi-directional forging.This work was supported by the National Nat(51771201)

Key Research Program of Frontier Sciences,CAS(QYZDY-SSW-JSC027)

出版年

2021
材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI
影响因子：0.657
ISSN：1005-0302
参考文献量56
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