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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 $550^{\circ}C$. 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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참고문헌 (19)
참고문헌 신청
M. X. Zang / 2003 / Scripta Mater 48:379
J. F. Nie / 2003 / Scripta Mater 48:1009
D. H. Bae / 2002 / Acta Mater 50:2343
A. Singh / 2003 / Scripta Mater 49:417
김우정 / 2010 / Structural Characterization of Laves-Phase MgZn2 Precipitated in Mg-Zn-Y Alloy / Metals and Materials International 16(2):171~174
J. F. Nie / 2003 / Scripta Mater 48:1009
D. H. Bae / 2002 / Acta Mater 50:2343
A. Singh / 2003 / Scripta Mater 49:417
김우정 / 2010 / Structural Characterization of Laves-Phase MgZn2 Precipitated in Mg-Zn-Y Alloy / Metals and Materials International 16(2):171~174
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