The formation mechanisms of growth twins in polycrystalline Al with high stacking fault energy

被引：50

作者：

Xue, S. ^{[1
]}

Fan, Z. ^{[1
]}

Chen, Y. ^{[2
]}

Li, J. ^{[3
]}

Wang, H. ^{[4
]}

Zhang, X. ^{[1
]}

机构：

[1] Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA

[2] Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA

[3] Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA

[4] Texas A&M Univ, Dept Elect Engn, College Stn, TX 77843 USA

来源：

ACTA MATERIALIA | 2015年 / 101卷

基金：

美国国家科学基金会;

关键词：

Nanotwinned Al; Growth twin; Defect nucleation kinetics; DEFORMATION TWINS; STAINLESS-STEEL; THERMAL-STABILITY; GRAIN-BOUNDARIES; MAXIMUM STRENGTH; COHERENT; ALUMINUM; COPPER; DISLOCATIONS; DENSITY;

D O I：

10.1016/j.actamat.2015.08.046

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Growth twins are scarcely observed in metals with high stacking fault energy, such as pure Al. In this study, however, we report the observation of growth twins in sputtered polycrystalline Al films on amorphous substrates and a majority of these growth twins are inclined to the growth direction (inclined twins). Although the fraction of twinned grains is low in general, it increases monotonically with increasing film thickness, reaches a maximum at the film thickness of 80 nm, and decreases gradually thereafter in the thicker films. The nucleation mechanism for the inclined twins is compared with that of the parallel growth twins in Al. Different twin formation mechanisms are discussed. This study provides an alternative perspective to evaluate the formation of growth twins in metals with high stacking fault energy. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：62 / 70

页数：9

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