Premium
Kinetics analysis of the isothermal crystallization of Cu 55 Zr 45 metallic glass by differential scanning calorimetry
Author(s) -
Gao Qian,
Jian Zengyun
Publication year - 2019
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.21318
Subject(s) - differential scanning calorimetry , activation energy , crystallization , annealing (glass) , chemistry , amorphous metal , thermodynamics , nucleation , avrami equation , arrhenius equation , isothermal process , analytical chemistry (journal) , crystallography , amorphous solid , chromatography , physics , organic chemistry
Abstract The crystallization kinetics of Cu 55 Zr 45 (at%) glassy alloy is studied under isothermal condition using differential scanning calorimetry (DSC). The plot of correlation between the crystallized volume fraction α and annealing time t shows a sigmoid‐type curve, which is steeper with higher annealing temperature. Furthermore, in isothermal crystallization condition, local activation energy E α values, determined using the Arrhenius equation, range from 181.1 to 187.8 kJ/mol, which is nearly a constant. The local Avrami exponent n (α) values, obtained by the Johnson‐Mehl‐Avrami equation, which range from 2.2 to 4.0 at different annealing temeperatures, which indicates that the crystallization mechanism is diffusion‐controlled transformation. Moreover, n (α) becomes greater with increasing annealing temperature, which indicates that annealing temperature can affect nucleation rate and growth type.