Journal
SCRIPTA MATERIALIA
Volume 123, Issue -, Pages 5-8Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2016.05.035
Keywords
Magnesium alloys; Precipitates; Interface segregation; HAADF-STEM; EDS-STEM
Categories
Funding
- National Natural Science Foundation of China [51131009, 51201189, 51421001]
- National Key Basic Research Program of China [2013CB632201]
- Natural Science Foundation Project of CQ [cstc2013jcyjA50037]
- Fundamental Research Funds for the Central Universities [CDJZR 12130073, CDJZR 12130042]
- Postgraduates Innovation Project of Chongqing University
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Additions of Zn can significantly improve the age-hardening response of binary Mg-Sn alloys by refining the distribution of Mg2Sn precipitates, but its role in the precipitation is still unclear. In this study, the Mg2Sn precipitates with different morphologies and orientations in a Mg-9.8Sn-1.2Zn (wt.%) alloy are characterized by high angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and STEM X-ray mapping. It is found that Zn atoms invariably segregate to the Mg2Sn-Mg interface, irrespective of the interfacial structures and orientation relationships of Mg2Sn. This finding provides insight to the understanding of the enhanced nucleation of Mg2Sn precipitates in Mg-Sn-Zn alloys. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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