Formation of fivefold deformation twins in an ultrafine-grained copper alloy processed by high-pressure torsion

被引：47
|
作者：
An, X. H. [1 ]
Lin, Q. Y. [1 ]
Wu, S. D. [1 ]
Zhang, Z. F. [1 ]
Figueiredo, R. B. [2 ]
Gao, N. [3 ]
Langdon, T. G. [3 ,4 ,5 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
[2] Univ Fed Minas Gerais, Dept Met & Mat Engn, BR-31270901 Belo Horizonte, MG, Brazil
[3] Univ Southampton, Sch Engn Sci, Mat Res Grp, Southampton SO17 1BJ, Hants, England
[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
来源：
SCRIPTA MATERIALIA | 2011年 / 64卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Cu-Al alloy; Fivefold deformation twin; Ultrafine grains; High-pressure torsion; Twinnability; STACKING-FAULT ENERGY; CU-AL ALLOYS; STRAIN; MECHANISM; EVOLUTION;
D O I：
10.1016/j.scriptamat.2010.10.012
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Fivefold deformation twins (DTs) are formed in an ultrafine grain, with a size of similar to 100 nm, of a Cu-16 at% Al alloy processed by high-pressure torsion. Formation occurs through the sequential emission of partial dislocations from grain boundaries and other multiple twin boundaries. These observations confirm the emission of partial dislocations from multiple-fold nodes which can be attributed to increased twinnability via the introduction of Al atoms which lower the driving force for partial emission. Crown Copyright (C) 2010 Published by Elsevier Ltd. on behalf of Acta Materialia Inc. All rights reserved.
引用
收藏
页码：249 / 252
页数：4
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