Solidification microstructure of as-cast Mg-Zn-Y alloys

J. B. Ok; I. J. Kim; S. Yi; W. T. Kim; D. H. Kim

doi:10.1080/0141861031000113325

Solidification microstructure of as-cast Mg-Zn-Y alloys

J. B. Ok, I. J. Kim, S. Yi, W. T. Kim, D. H. Kim

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31 Scopus citations

Abstract

Composites consisting of icosahedral (i) phase and ductile α-Mg can be fabricated by controlling the alloy composition. With increasing Mg content, the primary solidification phase changed from the i phase to the α-Mg phase and single eutectic structure can be obtained at a composition of Mg ₇₂Zn_23.5Y_3.5. The i phase showed a variation in structural order from the well-ordered icosahedral phase to the 1/1 rhombohedral approximant with lattice constants a = 27.2 Å and α = 63.43°. The structural change in the i phase can be explained by microdomain formation due to compositional change during solidification. Annealing treatment improves the structural order of the i phase by homogenization. By controlling the alloy composition, a single eutectic structure consisting of a hard i phase and a ductile α-Mg phase could be obtained.

Original language	English
Pages (from-to)	2359-2369
Number of pages	11
Journal	Philosophical Magazine
Volume	83
Issue number	20
DOIs	https://doi.org/10.1080/0141861031000113325
State	Published - 11 Jul 2003

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title = "Solidification microstructure of as-cast Mg-Zn-Y alloys",

abstract = "Composites consisting of icosahedral (i) phase and ductile α-Mg can be fabricated by controlling the alloy composition. With increasing Mg content, the primary solidification phase changed from the i phase to the α-Mg phase and single eutectic structure can be obtained at a composition of Mg 72Zn23.5Y3.5. The i phase showed a variation in structural order from the well-ordered icosahedral phase to the 1/1 rhombohedral approximant with lattice constants a = 27.2 {\AA} and α = 63.43°. The structural change in the i phase can be explained by microdomain formation due to compositional change during solidification. Annealing treatment improves the structural order of the i phase by homogenization. By controlling the alloy composition, a single eutectic structure consisting of a hard i phase and a ductile α-Mg phase could be obtained.",

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T1 - Solidification microstructure of as-cast Mg-Zn-Y alloys

AU - Ok, J. B.

AU - Kim, I. J.

AU - Yi, S.

AU - Kim, W. T.

AU - Kim, D. H.

PY - 2003/7/11

Y1 - 2003/7/11

N2 - Composites consisting of icosahedral (i) phase and ductile α-Mg can be fabricated by controlling the alloy composition. With increasing Mg content, the primary solidification phase changed from the i phase to the α-Mg phase and single eutectic structure can be obtained at a composition of Mg 72Zn23.5Y3.5. The i phase showed a variation in structural order from the well-ordered icosahedral phase to the 1/1 rhombohedral approximant with lattice constants a = 27.2 Å and α = 63.43°. The structural change in the i phase can be explained by microdomain formation due to compositional change during solidification. Annealing treatment improves the structural order of the i phase by homogenization. By controlling the alloy composition, a single eutectic structure consisting of a hard i phase and a ductile α-Mg phase could be obtained.

AB - Composites consisting of icosahedral (i) phase and ductile α-Mg can be fabricated by controlling the alloy composition. With increasing Mg content, the primary solidification phase changed from the i phase to the α-Mg phase and single eutectic structure can be obtained at a composition of Mg 72Zn23.5Y3.5. The i phase showed a variation in structural order from the well-ordered icosahedral phase to the 1/1 rhombohedral approximant with lattice constants a = 27.2 Å and α = 63.43°. The structural change in the i phase can be explained by microdomain formation due to compositional change during solidification. Annealing treatment improves the structural order of the i phase by homogenization. By controlling the alloy composition, a single eutectic structure consisting of a hard i phase and a ductile α-Mg phase could be obtained.

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Solidification microstructure of as-cast Mg-Zn-Y alloys

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