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DSC Transformation Behaviour of a bcc Mg 11 Sm Phase Prepared by Rapid Solidification
Author(s) -
Budurov Stojan,
Zolova Genka
Publication year - 1993
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170280707
Subject(s) - isothermal process , thermodynamics , avrami equation , kinetics , materials science , activation energy , phase (matter) , decomposition , alloy , phase transition , crystallography , chemistry , metallurgy , arrhenius equation , physics , organic chemistry , quantum mechanics
The transformation behaviour of the bcc Mg 11 Sm phase prepared by rapid solidification from the melt has been studied by DSC. The Kissinger and Ozawa equations led to the following activation energies of the first and the second phase transition: E ≈ 130 kJ/mol and E ≈ 194 kJ/mol, respectively. Isothermal Avrami kinetics of the first phase transition starts with an Avrami exponent n ≈ 2,5, dropping down at higher degrees of transformation to n ≈ 1.5. The data obtained have been compared with the parameters of the isothermal Avrami kinetics of decomposition of a rapidly quenched supersaturated MgYb 4.87 alloy.