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Etude de la précipitation en dynamique d'amas dans les alliages d'aluminium et dans les aciers

Abstract : The prediction of precipitation kinetics in alloys is a key issue in metallurgical industry. This study focuses on the modelling of homogeneous precipitation using cluster dynamics in an attempt to improve the understanding of the controlling phenomena. In the first stage, an agreement has been found between this technique and methods based on classical nucleation theory. The influence of the precision of the calculation of cluster free energy on the nucleation kinetics has been studied by comparing cluster dynamics and Monte Carlo kinetics simulations on alloy systems iron-copper, aluminium-zirconium and aluminium-scandium. The agreement found between the two models has enabled the development of a cluster dynamics model that accounts for the non-stoichiometry of L12 Al3ZrXSc1-X precipitates in the ternary system AlZrSc. The results of this simulation compare well to Kinetic Monte Carlo simulations. The ternary system has also been characterised experimentally using small angle X-ray scattering and transmission electron microscopy. The evolution of the precipitate volume fraction, average radius and composition, were followed over the initial stages of precipitation. The experimental and theoretical works on the ternary system both highlight the strong competition between the preferential thermodynamic pathways and kinetics, as well as showing the strong effect of segregation of zirconium to the precipitate surface on the coarsening regime.
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Contributor : Ludovic Laé <>
Submitted on : Thursday, May 26, 2005 - 10:04:26 AM
Last modification on : Friday, November 6, 2020 - 4:39:26 AM
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Ludovic Laé. Etude de la précipitation en dynamique d'amas dans les alliages d'aluminium et dans les aciers. Matériaux. Institut National Polytechnique de Grenoble - INPG, 2004. Français. ⟨tel-00009313⟩

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