Interphase boundary segregation of Zn in Mg-Sn-Zn alloys

Chaoqiang Liu, Houwen Chen, Jian Feng Nie

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55 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)5-8
Number of pages4
JournalScripta Materialia
Volume123
DOIs
Publication statusPublished - 1 Oct 2016

Keywords

  • EDS-STEM
  • HAADF-STEM
  • Interface segregation
  • Magnesium alloys
  • Precipitates

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