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

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

Research output: Contribution to journalArticle

32 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

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Dendrites (metallography)
Yield stress
Solidification
Precipitates
Mechanical properties
Microstructure

All Science Journal Classification (ASJC) codes

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

Cite this

Kim, Do Hyang ; Kim, Y. K. ; Sohn, S. W. ; Kim, Do H. ; Kim, W. T. / Role of icosahedral phase in enhancing the strength of Mg-Sn-Zn-Al alloy. In: Journal of Alloys and Compounds. 2013 ; Vol. 549. pp. 46-50.
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Role of icosahedral phase in enhancing the strength of Mg-Sn-Zn-Al alloy. / Kim, Do Hyang; Kim, Y. K.; Sohn, S. W.; Kim, Do H.; Kim, W. T.

In: Journal of Alloys and Compounds, Vol. 549, 05.02.2013, p. 46-50.

Research output: Contribution to journalArticle

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AB - 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.

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