Applied Microscopy

Korean Society of Microscopy (한국현미경학회)
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Crystallization Behavior of Al-Ni-Y Amorphous Alloys

  • Na, Min Young (Center for Non-crystalline Materials, Department of Materials Science and Engineering, Yonsei University) ;
  • Kim, Kang Cheol (Center for Non-crystalline Materials, Department of Materials Science and Engineering, Yonsei University) ;
  • Kim, Won Tae (Department of Optical Engineering, Cheongju University) ;
  • Kim, Do Hyang (Center for Non-crystalline Materials, Department of Materials Science and Engineering, Yonsei University)
  • Received : 2013.09.24
  • Accepted : 2013.09.25
  • Published : 2013.09.30
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Abstract

The crystallization behavior in the $Al_{87}Ni_3Y_{10}$ and $Al_{88}Ni_3Y_9$amorphous alloys has been investigated. As-quenched $Al_{87}Ni_3Y_{10}$ amorphous phase decomposes by simultaneous formation of Al and intermetallic phase at the first crystallization step, while as-quenched $Al_{88}Ni_3Y_9$ 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 $Al_{87}Ni_3Y_{10}$ and $Al_{88}Ni_3Y_9$ alloys.

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References

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