MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Crystallization Kinetics of Ti-Zr-Ni-Cu Metallic Glasses
Xinquan GuoDmitri LouzguineAkihisa Inoue
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2001 Volume 42 Issue 11 Pages 2406-2409

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Abstract

It was found that the Ti45−xZrxNi45−zCuz (0≤x≤10, 0≤z≤10) metallic glasses crystallize polymorphously and the crystal phase forms a solid solution of Zr and Cu in the TiNi phase. Differential scanning calorimetry (DSC) was used to study the crystallization kinetics of Ti–Zr–Ni–Cu metallic glasses near glass transition temperature. The fraction transformed y, as a function of time are of sigmoidal type at each temperature. For 0.10≤y≤0.85 the plots satisfy the Johnson-Mehl-Avrami equation and approximate to straight lines with exponent n varying from 3.1 to 3.9 as the annealing temperature increases. The activation energy for the crystallization of Ti45Zr5Ni45Cu5 metallic glass estimated from the temperature corresponding to 50% transformation is close to 380 kJ/mol.

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© 2001 The Japan Institute of Metals and Materials
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