Residual elastic strain induced by equal channel angular pressing on bulk metallic glasses

被引：17

作者：

Tong, Y. ^{[1
]}

Dmowski, W. ^{[1
]}

Witczak, Z. ^{[2
]}

Chuang, C-P. ^{[1
]}

Egami, T. ^{[1
,3
,4
]}

机构：

[1] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[2] Polish Acad Sci, Inst High Pressure Phys, Warsaw, Poland

[3] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[4] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

来源：

ACTA MATERIALIA | 2013年 / 61卷 / 04期

基金：

美国国家科学基金会;

关键词：

X-ray diffraction; Bulk metallic glasses; Plastic deformation; Equal channel angular pressing; Shear bands; MECHANICAL DEFORMATION; STRUCTURAL ANISOTROPY; AMORPHOUS-ALLOYS; BEHAVIOR; PLASTICITY; FLOW; STRESS; RANGE; STATE; RATIO;

D O I：

10.1016/j.actamat.2012.10.030

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We performed equal channel angular pressing (ECAP) on bulk metallic glasses with the composition of (La0.5Ce0.5)(65)Co25Al10 and Zr52.5Cu17.9Ni14.6Al10Ti5. The analysis of the high energy X-ray diffraction patterns indicates that anisotropic strain is present in the processed samples. We also determined the nature and magnitude of strain in the sample after thermo-mechanical creep, i.e. after homogenous deformation. Comparison between diffraction patterns indicates that the strain anisotropy in the ECAP processed samples is due to an elastic strain and is not induced by bond anisotropy as in creep samples. We conclude that the apparent elastic strain is brought on by a residual stress originating from the shear bands and that the deformation in ECAP experiment is inherently inhomogeneous. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1204 / 1209

页数：6

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