期刊
JOURNAL OF DYNAMIC BEHAVIOR OF MATERIALS
卷 4, 期 2, 页码 222-230出版社
SPRINGERNATURE
DOI: 10.1007/s40870-018-0152-8
关键词
Magnesium; Deformation twinning; X-ray diffraction; Dynamic evolution; In situ
资金
- Army Research Laboratory
- National Science Foundation
- National Institutes of Health/National Institute of General Medical Sciences under NSF [DMR-1332208]
- DOE [DE-SC0016035, DE-SC0017631]
- Keck Foundation
- CHESS
- OSD-T&E (Office of Secretary Defense-Test and Evaluation) National Defense Education Program (NDEP)/BA-1, Basic Research [Defense-Wide/PE0601120D8Z]
- [W911NF-12-2-0022]
- U.S. Department of Energy (DOE) [DE-SC0016035] Funding Source: U.S. Department of Energy (DOE)
We report in situ time-resolved measurements of the dynamic evolution of the volume fraction of extension twins in polycrystalline pure magnesium and in the AZ31B magnesium alloy, using synchrotron x-ray diffraction during compressive loading at high strain rates. The dynamic evolution of the twinning volume fraction leads to a dynamic evolution of the texture. Although both the pure metal and the alloy had similar initial textures, we observe that the evolution of texture is slower in the alloy. We also measured the evolution of the lattice strains in each material during deformation which, together with the twin volume fractions, allows us to place some constraints on the relative contributions of dislocation-based slip and deformation twinning to the overall plastic deformation during the dynamic deformations.
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