화학공학소재연구정보센터
Korean Journal of Materials Research, Vol.21, No.3, 168-173, March, 2011
Mg-Zn-Y(ZW61) 합금에서 Icosahedral 준결정상의 석출
Precipitation of Icosahedral Qusicrystal Phase in Mg-Zn-Y(ZW61) alloy
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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 550oC. In the alloy annealed at 400oC, polygonshaped I-phases are observed in the α-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//(210)Mg and [I2]I//[311]Mg, (5f)I//(011)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 63.4o or 116.6o around two fold zone axis.
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