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

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

[Display omitted] 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 elonga...

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Bibliographic Details
Published in:Acta materialia Vol. 101; pp. 71 - 79
Main Authors: Tang, W., Halm, K.L., Trinkle, D.R., Koker, M.K.A., Lienert, U., Kenesei, P., Beaudoin, A.J.
Format: Journal Article
Language:English
Published: United States Elsevier Ltd 01-12-2015
Elsevier
Subjects:
Cyclic micro-plasticity
Detectors
Diffraction
Exponents
High-energy X-ray diffraction
Magnesium base alloys
Mg alloy
Plasticity
Slip
Stress relaxation
X-rays
Cyclic micro-plasticity
High-energy X-ray diffraction
Stress relaxation
Mg alloy
Plasticity
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Summary:[Display omitted] 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.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
AC02-06CH11357
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2015.08.072