期刊
SCRIPTA MATERIALIA
卷 178, 期 -, 页码 193-197出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.11.025
关键词
Segregation; Twin boundary; Magnesium alloy; HAADF-STEM
类别
资金
- National Key Research and Development Program of China [2017YFA0204402]
- National Natural Science Foundation of China [51601003, 11672323, 11572328, 51901103, 51601204]
- Fundamental Research Funds for the Central Universities [30918011342]
- U.S. Army Research Office [W911 NF-17-1-0350]
Segregation of solute atoms at twin boundaries (TBs) plays a critical role in mechanical properties and thermal stability of magnesium alloys. Here, segregation structures at {10 (1) over bar1}, {10 (1) over bar2} and {10 (1) over bar3} TBs are characterized in a Mg-Ag alloy by means of the atomic resolution high-angle annular dark-field technique based on scanning transmission electron microscopy. Of particular finding is the unique complex segregation at {10 (1) over bar3} TBs, where Ag atoms occupy both substitutional and interstitial sites. By contrast, Ag atoms only substitutionally segregate at {10 (1) over bar1} and {10 (1) over bar2} TBs. Calculation simulation of segregation energy and three-dimensional structure of TBs helps understanding of hybrid segregation. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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