Zn segregation in interface between Mg17Al12 precipitate and Mg matrix in Mg–Al–Zn alloys

C. Q. Liu, H. W. Chen, N. C. Wilson, J. F. Nie

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Abstract

The interface between continuous Mg17Al12 precipitate and the Mg matrix in Mg–9Al–3Zn alloy has been characterized using aberration-corrected scanning transmission electron microscopy. It is found that Zn segregation occurs in the partially-coherent interface that is parallel to the basal plane of the Mg matrix and contains an array of misfit dislocations. The segregated Zn atoms substitute for the Al atoms within the interface and the segregation is not affected by the presence of the misfit dislocations. First-principles calculations suggest that Zn segregation is energetically favored.

Original languageEnglish
Pages (from-to)91-95
Number of pages5
JournalScripta Materialia
Volume163
DOIs
Publication statusPublished - 1 Apr 2019

Keywords

  • AZ alloys
  • DFT
  • HAADF-STEM
  • Interfacial segregation

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