Enhancement of strain-rate sensitivity and shear yield strength of a magnesium alloy processed by high-pressure torsion

被引：57

作者：

Choi, In-Chul ^{[1
]}

Lee, Dong-Hyun ^{[1
]}

Ahn, Byungmin ^{[2
]}

Durst, Karsten ^{[3
]}

Kawasaki, Megumi ^{[1
]}

Langdon, Terence G. ^{[4
,5
,6
]}

Jang, Jae-il ^{[1
]}

机构：

[1] Hanyang Univ, Div Engn & Mat Sci, Seoul 133791, South Korea

[2] Ajou Univ, Dept Energy Syst Res, Suwon 443749, South Korea

[3] Tech Univ Darmstadt, Dept Mat Sci, D-64287 Darmstadt, Germany

[4] Univ So Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA

[5] Univ So Calif, Dept Mat Sci, Los Angeles, CA 90089 USA

[6] Univ Southampton, Fac Engn & Environm, Mat Res Grp, Southampton SO17 1BJ, Hants, England

来源：

SCRIPTA MATERIALIA | 2015年 / 94卷

基金：

欧洲研究理事会;

关键词：

Grain boundary sliding; High-pressure torsion; Magnesium alloy; Strain-rate sensitivity; Yielding; INCIPIENT PLASTICITY; GRAIN-REFINEMENT; RATE DEPENDENCE; NANOINDENTATION; BEHAVIOR; HARDNESS; FLOW; NUCLEATION; PRINCIPLES; EVOLUTION;

D O I：

10.1016/j.scriptamat.2014.09.014

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A Mg-Zn-Zr alloy was processed by high-pressure torsion for up to 2 turns at room temperature to produce significant grain refinement together with enhanced plasticity and strength. Measurements were performed to determine the strain-rate sensitivity, shear yield strength and activation volume as a function of the processing conditions. The results suggest there is a significant contribution from grain boundary sliding to the flow process and the onset of plasticity is associated with heterogeneous dislocation nucleation. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：44 / 47

页数：4

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