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Spatially resolved in situ strain measurements from an interior twinned grain in bulk polycrystalline AZ31 alloy
L. Balogh, S.R. Niezgoda, , D.W. Brown, B. Clausen, W. Liu, Carlson N. Tomé
Published in
2013
Volume: 61
   
Issue: 10
Pages: 3612 - 3620
Abstract
In this paper, we report for the first time, to our knowledge, spatially resolved measurements of strain gradients across a grain containing twins, located in the bulk of a polycrystalline Mg AZ31 sample. We also report orientation mapping on three parallel sections from the bulk of the sample. We use for such purpose the technique of differential-aperture X-ray microscopy (DAXM) based on synchrotron X-rays. The DAXM technique allows us to map crystallographic strains with sub-micron-sized spatial resolution. The results of this experiment confirm indirect evidence from previous experiments having less spatial resolution that important stress gradients exist in the vicinity of twin boundaries. Such a result is relevant to understanding twin growth and de-twinning, since both mechanisms are affected by stress-driven twin dislocations at the interface. © 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
About the journal
JournalActa Materialia
Open AccessNo
Concepts (13)
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    CRYSTALLOGRAPHIC STRAIN
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    EXPERIMENT CONFIRM
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    LAUE DIFFRACTION
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    MAGNESIUM AZ31
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    ORIENTATION MAPPING
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    Spatial resolution
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    Spatially resolved
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    X RAY MICROSCOPY
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    Cerium alloys
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    Strain
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    Twinning
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    X RAY MICROSCOPES
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    X rays