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Effect of Micro-Steps on Twinning and Interfacial Segregation in Mg-Ag Alloy.
- Source :
-
Materials (Basel, Switzerland) [Materials (Basel)] 2019 Apr 22; Vol. 12 (8). Date of Electronic Publication: 2019 Apr 22. - Publication Year :
- 2019
-
Abstract
- Twinning structures and their interfacial segregation play a key role in strengthening of magnesium alloys. Micro-steps are frequently existed in the incoherent twin boundaries, while the effect of them on interface and interfacial segregation is still not clear. In this work, we performed an atomic-scale microstructure analysis using high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) to explore the effect of micro-steps on twin and its interfacial segregation in Mg-Ag alloy. Diffraction pattern of the incoherent {10 1 ¯ 1} twin shows that the misorientation has a slight tilt of 5° from its theoretical angle of 125° due to the accumulated effects of the micro-steps and their misfit dislocations in twin boundaries. Most of the micro-steps in {10 1 ¯ 1} twin boundary are in the height of 2 d ( 10 1 ¯ 1 ) and 4 d ( 10 1 ¯ 1 ) , respectively, and both of them have two types according to whether there are dislocations on the micro-steps. The twin boundary is interrupted by many micro-steps, which leads to a step-line distributed interfacial segregation. Moreover, the Ag tends to segregate to dislocation cores, which results in the interruption of interfacial segregation at the micro-steps with dislocations.
Details
- Language :
- English
- ISSN :
- 1996-1944
- Volume :
- 12
- Issue :
- 8
- Database :
- MEDLINE
- Journal :
- Materials (Basel, Switzerland)
- Publication Type :
- Academic Journal
- Accession number :
- 31013603
- Full Text :
- https://doi.org/10.3390/ma12081307