Effect of dislocation configuration on Ag segregation in subgrain boundary of a Mg-Ag alloy

SCRIPTA MATERIALIA

卷:191

Article

Xiao, Lirong¹  Chen, Xuefei²  Wei, Kang¹  Liu, Yi¹  Yin, Dongdi³  Hu, Zhaohua⁴  Zhou, Hao¹  Zhu, Yuntian^1,5 

[1] Nanjing Univ Sci & Technol, Nano & Heterogeneous Mat Ctr, Nanjing 210094, Peoples R China

[2] Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China

[3] Southwest Jiaotong Univ, Sch Mat Sci & Engn, Chengdu 610031, Sichuan, Peoples R China

[4] Ansteel Beijing Res Inst Co Ltd, Beijing 102209, Peoples R China

[5] North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA

关键词: Interfacial segregation;    Nanocrystallization;    Sub-grain boundary;    HAADF-STEM;    Mg alloy;   

DOI  :  10.1016/j.scriptamat.2020.08.040

来源: Elsevier

【 摘 要 】

Interfacial segregation has been reported to play a critical role in the thermal-mechanical stability of nanocrystalline Mg alloys. Here we report Ag-segregation-assisted formation of nanocrystalline Mg-Ag alloy with high proportion of sub-grain boundaries during conventional rolling. The segregation structure is determined by dislocation configurations and subsequent strain field and misorientation of the subgrain boundary. It indicates that the alloying elements, which induce < c+ a > dislocations, would help to improve the stability of interfaces. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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