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KMID : 0381919960260020235
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Korean Journal of Microscopy
1996 Volume.26 No. 2 p.235 ~ p.241
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Bulk Amophisation and Decomposition Behavior of Mg-Cu-Y Alloys
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Kim Sang-Hyuk
Kim Do-Hyang
Lee Jong-Soo
Park Chan-Gyung
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Abstract
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Amophization and decomposition behaviour in $Mg_{62}Cu_{26}Y_{12}$ alloy prepared by melt spinning method and wedge type metal mold casting method have been investigated by a detailed transmission electron microscopy. Amorphous phase has formed in melt-spun ribbon. In the case of the wedge type specimen, however, the amorphous phase has formed only around the tip area within about 2 mm thickness. The remaining part of the wedge type specimen consists of crystalline phases, $Mg_{2}Cu\;and\;Cu_{2}Y$. The supercooling for crystallization behaviour of the amorphous $Mg_{62}Cu_{26}Y_{12}$ alloy, ${\Delta}T_x$ has been measured to be about 60 K. Such a large undercooling of the crystallization bahaviour enables formation of the amorphous phase in the $Mg_{62}Cu_{26}Y_{12}$ alloy under the cooling rate of $10^{2}K/s$. The amorphous $Mg_{62}Cu_{26}Y_{12}$ has decomposed into crystalline phases, $Mg_{2}Cu\;and\;Cu_{2}Y$ after heat treatment at $170^{\circ}C\;and\;250^{\circ}C$.
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KEYWORD
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Mg-Cu-Y alloy, Bulk amorphous alloy, Wedge type solidification, Melt spun ribbon
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