Role of icosahedral phase in enhancing the strength of Mg-Sn-Zn-Al alloy

D. H. Kim, Y. K. Kim, S. W. Sohn, Do H. Kim, W. T. Kim

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The effect of the selection of the secondary solidification phase on the mechanical properties of the Mg-Sn-Zn and Mg-Sn-Zn-Al alloy rolled sheets has been investigated in the present study. The as-cast microstructure of Mg-7Sn-2Zn (in wt.%) alloy consists of α-Mg dendrite and interdendritic Mg 2Sn and MgZn2 phases, while that of Mg-7Sn-5Zn-2Al alloy consists of α-Mg dendrite and interdendritic Mg2Sn and icosahedral (I-) phases. The micron scale interdendritic I-phase in the as-cast Mg-7Sn-5Zn-2Al alloy dissolves into the matrix during homogenizing treatment, and appears again in the α-Mg matrix as 0.1-0.5 μm size fine spherical precipitates after rolling process. As a result, the Mg-7Sn-5Zn-2Al alloy exhibits high yield strength of 318 MPa in as-rolled state. The high level of strength is attributed to the presence of finely distributed Mg2Sn and I-phase particles embedded in the α-Mg matrix.

Original languageEnglish
Pages (from-to)46-50
Number of pages5
JournalJournal of Alloys and Compounds
Volume549
DOIs
Publication statusPublished - 2013 Feb 5

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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