期刊
ACTA MATERIALIA
卷 61, 期 10, 页码 3612-3620出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2013.02.048
关键词
Twinning; Magnesium AZ31; Intra-granular strain; Differential-aperture X-ray microscopy; 3-D X-ray Laue diffraction microscope
资金
- Office of Basic Energy Sciences under US DOE [FWP 06SCPE401, W-7405-ENG-36]
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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