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KMID : 0381920130430030127
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Korean Journal of Microscopy
2013 Volume.43 No. 3 p.127 ~ p.131
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Crystallization Behavior of Al-Ni-Y Amorphous Alloys
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Na Min-Young
Kim Kang-Cheol
Kim Won-Tae
Kim Do-Hyang
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Abstract
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The crystallization behavior in the Al87Ni3Y10 and Al88Ni3Y9 amorphous alloys has been investigated. As-quenched Al87Ni3Y10 amorphous phase decomposes by simultaneous formation of Al and intermetallic phase at the first crystallization step, while as-quenched Al88Ni3Y9 amorphous phase decomposes by forming Al nanocrystals in the amorphous matrix. The density of Al nanocrystals is extremely high and the size distribution is homogeneous. Such a microstructure can result from rapid explosion of the nucleation event in the amorphous matrix or growth of the preexisting nuclei embedded in the as-quenched amorphous matrix. The final equilibrium crystalline phases and their distribution at 873 K are exactly same in both Al87Ni3Y10 and Al88Ni3Y9 alloys.
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KEYWORD
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Amorphous alloy, Crystallization
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