Applied Microscopy

Korean Society of Microscopy (한국현미경학회)
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Formation of Icosahedral Phase in Bulk Glass Forming Ti-Zr-Be-Cu-Ni Alloy

  • Park, Jin Man (Global Technology Center, Samsung Electronics., Ltd.) ;
  • Lee, Jun Hyeok (Division of Advanced Materials Engineering, Kongju National University) ;
  • Jo, Mi Seon (Division of Advanced Materials Engineering, Kongju National University) ;
  • Lee, Jin Kyu (Division of Advanced Materials Engineering, Kongju National University)
  • Received : 2015.06.19
  • Accepted : 2015.06.24
  • Published : 2015.06.30
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Abstract

Formation of an icosahedral phase in the bulk glass forming $Ti_{40}Zr_{29}Be_{14}Cu_9Ni_8$ alloy during crystallization from amorphous phase and solidification from melt is investigated. The icosahedral phase with a size of 10 to 15 nm forms as a thermodynamically stable phase at intermediate temperature during the transformation from amorphous to crystalline phases such as Laves and ${\beta}$-(Ti-Zr) phases, indicating that the existence of the icosahedral cluster in the undercooled liquid. On the other hand, the icosahedral phase forms as a primary solidification phase even though the Laves phase is stable at high temperature, which is can be explained based on the high nucleation rate of icosahedral phase relative to that of competing crystalline Laves phase due to lower interfacial energy between icosahedral and liquid phases.

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References

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