Journal
MATERIALS CHARACTERIZATION
Volume 156, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2019.109873
Keywords
Synchrotron radiation; Bending test; Magnesium alloys; Dislocation
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Funding
- National Natural Science Foundation of China [51474149, 51671127, 51631006]
- Science and Technology Commission of Shanghai Municipality [16DZ2260600, 18X120010001]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DEACO2-06CH11357]
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Differential aperture X-ray microscopy (DAXM) was employed in this study to reveal the development of geometrically necessary dislocations (GNDs) when a Mg-5 wt% Y alloy is subjected to bending. The characters of the GNDs were determined from the streak direction of the diffraction peaks. Five grains were analyzed voxel by voxel for the GND content. Among those voxels with peak streaking, 77% contain basal or non-basal < a > GNDs, while the other 23% contain < c + a > GNDs. Those < c + a > dislocations were nucleated to accommodate local stress concentration. Even though < c + a > dislocations are less mobile, they make important contribution to the high ductility of Mg-Y alloys.
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