A study of stress relaxation in AZ31 using high-energy X-ray diffraction

被引：11

作者：

Tang, W. ^{[1
]}

Halm, K. L. ^{[1
]}

Trinkle, D. R. ^{[1
]}

Koker, M. K. A. ^{[2
]}

Lienert, U. ^{[4
]}

Kenesei, P. ^{[3
]}

Beaudoin, A. J. ^{[1
]}

机构：

[1] Univ Illinois, Mech Sci & Engn, Urbana, IL 61801 USA

[2] Cornell Univ, Cornell High Energy Synchrotron Source, Ithaca, NY 14853 USA

[3] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[4] Deutsch Elektronen Synchrotron Photon Sci, Hamburg, Germany

来源：

ACTA MATERIALIA | 2015年 / 101卷

关键词：

Mg alloy; High-energy X-ray diffraction; Stress relaxation; Plasticity; Cyclic micro-plasticity; MAGNESIUM SINGLE-CRYSTALS; DEFORMATION MECHANISMS; TENSILE; ALLOY; STRAIN; BEHAVIOR; CREEP; SLIP; FLOW;

D O I：

10.1016/j.actamat.2015.08.072

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The micro-plasticity of the Mg alloy AZ31 is explored through high-energy X-ray diffraction (HEXD). Through cyclic loading of the sample, a softening response is found to follow the resolved shear stress for basal slip. Stress relaxation is studied by applying an incremental elongation increase while continuously collecting images from a detector array. The rate exponent associated with a particular reflection is developed by evaluating the average lattice strain in the loading direction from the composite detector image collected at a particular point in time, and then following the time evolution. A distinct rate exponent is identified for grain orientations that have a propensity for slip on second-order pyramidal planes, highlighting the capability to capture the simultaneous action of different deformation mechanisms through HEXD. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：71 / 79

页数：9

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