Solute segregation assisted nanocrystallization of a cold-rolled Mg-Ag alloy during annealing

被引：53

作者：

Xiao, L. R. ^{[1
,2
]}

Chen, X. F. ^{[2
]}

Cao, Y. ^{[2
]}

Zhou, H. ^{[1
,2
]}

Ma, X. L. ^{[3
]}

Yin, D. D. ^{[4
]}

Ye, B. ^{[5
,6
]}

Han, X. D. ^{[1
]}

Zhu, Y. T. ^{[2
,3
]}

机构：

[1] Beijing Univ Technol, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China

[2] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nano & Heterogeneous Mat Ctr, Nanjing 210094, Jiangsu, Peoples R China

[3] North Carolina State Univ, Dept Mat Sci & Engn, Box 7907, Raleigh, NC 27695 USA

[4] Southwest Jiaotong Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Adv Technol Mat, Chengdu 610031, Sichuan, Peoples R China

[5] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloys Net Forming, Shanghai 200240, Peoples R China

[6] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composite, Shanghai 200240, Peoples R China

来源：

SCRIPTA MATERIALIA | 2020年 / 177卷

基金：

中国国家自然科学基金;

关键词：

Nanocrystalline materials; Mg alloy; Transmission electron microscopy; Interfacial segregation; THERMAL-STABILITY; GRAIN-REFINEMENT; PHASE; BEHAVIOR; GROWTH; AL;

D O I：

10.1016/j.scriptamat.2019.10.012

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Refining grains to nanoscale has been a challenge, especially for materials with low-melting points and poor ductility, such as Mg alloys. Here we report a novel mechanism of nanocrystallization assisted by solute segregation, by which a nanocrystalline Mg-Ag alloy was produced by moderate cold rolling (similar to 55% strain) followed by low-temperature annealing. Specifically, during cold rolling non-basal < c + a > dislocations were activated to form dislocation cells walls, which were pinned by Ag segregation, and transformed into boundaries of nanocrystalline grains during annealing. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：69 / 73

页数：5

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