Crystallization Kinetics of Ti_<50>Ni_<25>Cu_<25> Melt-Spun Amorphous Ribbons
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The Avrami exponent <I>n</I> of Ti<SUB>50</SUB>Ni<SUB>25</SUB>Cu<SUB>25</SUB> amorphous ribbons during isothermal annealing derived from the Johnson-Mehl-Avrami equation is about 3.0 and shows good agreement with that obtained by Schloßmacher <I>et al.</I> This indicates that the main crystallization mechanism of Ti<SUB>50</SUB>Ni<SUB>25</SUB>Cu<SUB>25</SUB> ribbons is interface-controlled three-dimensional isotropic growth with early nucleation-site saturation. According to the Arrhenius relation, the activation energy for crystallization is 314 kJ/mol. This value is similar to that obtained using the Kissinger method, which implies that the crystallization during continuous heating or isothermal annealing follows a similar crystallization mechanism.
- Materials Transactions, JIM
Materials Transactions, JIM 47(10), 2489-2492, 2006-10-20
The Japan Institute of Metals and Materials