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- W1996041374 abstract "Abstract The solidification of a metastable ferromagnetic τ phase in undercooled MnAlC alloys is examined in terms of the relative thermodynamic phase stability and competitive kinetics. The heat of transformation ΔH t τ → ϵ of the metastable τ phase to the equilibrium h.c.p. ϵ phase and the heat of fusion ΔH f ϵ → l of the h.c.p. ϵ phase in a Mn 0.55 Al 0.433 C 0.017 alloy were measured to determine the Gibbs free energy differences between the metastable and stable phases as a function of temperature. The results indicate that a minimum amount of undercooling of ΔT = 87 K is required to form the metastable ferromagnetic τ phase over the equilibrium phases in a Mn 0.55 Al 0.433 C 0.017 alloy. The thermodynamic evaluation was applied further to develop a complete temperature-time-transformation (TTT) diagram of the Mn 0.55 Al 0.433 C 0.017 alloy based on a solid-state transformation kinetics analysis of the ϵ → τ reaction during isothermal treatments. This analysis reveals the critical cooling rate of the order of 20 K s −1 to bypass the metastable τ phase nucleation during solid state transformation in agreement with empirical observations. The combined thermodynamic and competitive kinetics analysis provide a unified guide for the processing of near equiatomic MnAl alloys." @default.
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- W1996041374 date "1993-05-01" @default.
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- W1996041374 title "The thermodynamics and competitive kinetics of metastable τ phase development in MnAl-base alloys" @default.
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- W1996041374 doi "https://doi.org/10.1016/0921-5093(93)90586-4" @default.
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