Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Precipitation of Icosahedral Qusicrystal Phase in Mg-Zn-Y(ZW61) alloy

Mg-Zn-Y(ZW61) 합금에서 Icosahedral 준결정상의 석출

  • Kwak, Ho-Yeon (Department of Nano Materials Engineering, Chungnam National university) ;
  • Lee, Kap-Ho (Department of Nano Materials Engineering, Chungnam National university)
  • 곽호연 (충남대학교 나노소재공학과) ;
  • 이갑호 (충남대학교 나노소재공학과)
  • Received : 2011.01.18
  • Accepted : 2011.02.13
  • Published : 2011.03.27
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Abstract

Precipitation of the ordered icosahedral quasicrystal in Mg-6wt%Zn-1wt%Y alloy has been characterized by transmission electron microscopy observations. The lamellar-type icosahedral qusicrystal phases (I-phase) with the face-centered icosahedral (FCI) structure are observed in alloy after solution treatment at $550^{\circ}C$. In the alloy annealed at $400^{\circ}C$, polygon-shaped I-phases are observed in the ${\alpha}$-Mg matrix. The interfaces of the I-phase with the matrix are facetted and the facets are on five-fold and two- fold plane of the I-phase. The orientation relationship of the I-phase with the matrix is determined to be $[I5]_I//[001]_{Mg}$, $(2f)_I//(2\overline{1}0)_{Mg}$ and $[I2]_I//[311]_{Mg}$, $(5f)_I//(0\overline{1}1)_{Mg}$. The icosahedral grains are occasionally found to be twinned with one of the five-fold axis as the twin axis. The twin boundaries appear to be fairly straight and perpendicular to the fivefold twin axis. The icosahedral twin can be expressed as a rotation of $63.4^{\circ}$ or $116.62^{\circ}$ around two fold zone axis.

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