Characteristic dislocation substructure in {10(1)over-bar2} twins in hexagonal metals

被引：60
作者：
Wang, F. [1 ]
Hazeli, K. [2 ]
Molodov, K. D. [3 ]
Barrett, C. D. [4 ,5 ]
Al-Samman, T. [3 ]
Molodov, D. A. [3 ]
Kontsos, A. [6 ]
Ramesh, K. T. [7 ]
El Kadiri, H. [5 ]
Agnew, S. R. [1 ]
机构：
[1] Univ Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA
[2] Univ Alabama, Dept Mech & Aerosp Engn, Huntsville, AL 35899 USA
[3] Rhein Westfal TH Aachen, Inst Phys Met & Met Phys, D-52056 Aachen, Germany
[4] Mississippi State Univ, Ctr Adv Vehicular Syst, Starkville, MS 39759 USA
[5] Mississippi State Univ, Dept Mech Engn, Starkville, MS 39759 USA
[6] Drexel Univ, Dept Mech Engn & Mech, Philadelphia, PA 19104 USA
[7] Johns Hopkins Univ, Hopkins Extreme Mat Inst, Baltimore, MD 21218 USA
来源：
SCRIPTA MATERIALIA | 2018年 / 143卷
基金：
美国国家科学基金会;
关键词：
Single crystal; Twinning; Dislocation; Fault; Plasticity; PLANE-STRAIN COMPRESSION; MAGNESIUM ALLOY; STACKING-FAULTS; ELECTRON-MICROSCOPY; DEFORMATION TWINS; ZINC-CRYSTALS; EVOLUTION; BOUNDARY; MG; TRANSMUTATION;
D O I：
10.1016/j.scriptamat.2017.09.015
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Based on transmission electron microscopy results from pure Mg single crystal examined in the current work, and Mg alloys and other hexagonal metals in literature, a characteristic dislocation substructure inside {10 (1) over bar2} twins is identified. Abundant non-basal [c] and < c + a > perfect dislocations, as well as basal Li stacking faults with widths on the order of 100 nm distributed preferentially in the vicinity of a twin boundary, with a low density zone in the middle of the twin. Considering the ubiquity of {10 (1) over bar2} twins, this characteristic dislocation substructure should be considered in modeling of hexagonal metal alloy deformation. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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收藏
页码：81 / 85
页数：5
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