期刊
MATERIALS CHARACTERIZATION
卷 160, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2019.110082
关键词
Magnesium; Deformation twin; Strain characterization; Peak-pair method; Nano-beam electron diffraction method
类别
资金
- Office of Basic Energy Sciences, Project FWP under US DOE [06SCPE401, W-7405-ENG-36]
- National Natural Science Foundation of China [51901129]
- U.S. Dept. of Energy [DE-AC0205CH11231]
- Electron Microscopy Lab at Los Alamos National Laboratory
The localized plastic shear associated with deformation twinning induces both, dislocation emission and elastic strain fields near twin interfaces. In this work, we modified a standard peak-pair algorithm (PP) to extract the local elastic strain field associated with twins in Mg from the observed atomic structure. We also used nano-beam electron diffraction (NBED) method for comparison and to characterize the strain field at several positions inside and in the vicinity of a twin. The results reveal: (1) a much larger stress concentration near the basal-prismatic interface than at the coherent twin boundary; (2) a stress concentration in the matrix ahead of the twin tip that seems to be associated with dislocation pileups. This work provides insight at the nanometric scale about the elastic strain field associated with both elastic and plastic deformation in the vicinity of twin interfaces.
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