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arXiv · 1711.04984

Solid solution decomposition and Guinier-Preston zone formation in Al-Cu alloys: A kinetic theory with anisotropic interactions

A. Yu. Stroev·O. I. Gorbatov·Yu. N. Gornostyrev·P. A. Korzhavyi
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Abstract

Using methods of statistical kinetic theory parametrized with first-principles interatomic interactions that include chemical and strain contributions, we investigated the kinetics of decomposition and microstructure formation in Al-Cu alloys as a function of temperature and alloy concentration. We show that the decomposition of the solid solution forming platelets of copper, known as Guinier-Preston (GP) zones, includes several stages and that the transition from GP1 to GP2 zones is determined mainly by kinetic factors. With increasing temperature, the model predicts a gradual transition from platelet-like precipitates to equiaxial ones and at intermediate temperatures both precipitate morphologies may coexist.

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A. Yu. Stroev, O. I. Gorbatov, Yu. N. Gornostyrev, P. A. Korzhavyi. 2017-11-14. Solid solution decomposition and Guinier-Preston zone formation in Al-Cu alloys: A kinetic theory with anisotropic interactions. https://doi.org/10.1103/physrevmaterials.2.033603

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