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Abstract: By means of low-temperature expansions LTEs, the nucleation free energy andthe precipitate interface free energy are expressed as functions of thesolubility limit for alloys which lead to the precipitation of a stoichiometricL12 compound such as Al-Sc or Al-Zr alloys. Classical nucleation theory is thenused to obtain a simple expression of the nucleation rate whose validity isdemonstrated by a comparison with atomic simulations. LTEs also explain whysimple mean-field approximation like the Bragg-Williams approximation fails topredict correct nucleation rates in such an ordering alloy.



Autor: Emmanuel Clouet SRMP, Maylise Nastar SRMP

Fuente: https://arxiv.org/







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