Effect of an applied stress on the recrystallization mechanisms of a zirconium alloy

International audienceThe effect of an applied stress on the mechanism and kinetics of recrystallization of the zirconium alloy Zircaloy-4 is investigated by electron backscattered diffraction. Applying stress during the recrystallization slows down the growth stage. According to the stress amplitude, the nucleation rate is either accelerated or slowed down. A simple model is proposed to take into account these phenomena. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved

3D reconstruction of a multiscale microstructure by anisotropic tessellation models

International audienceIn the area of tessellation models, there is an intense activity to fully understand the classical models of Voronoi, Laguerre and Johnson-Mehl. Still, these models are all simulations of isotropic growth and are therefore limited to very simple and partly convex cell shapes. The here considered microstructure of martensitic steel has a much more complex and highly non convex cell shape, requiring new tessellation models. This paper presents a new approach for anisotropic tessellation models that resolve to the well-studied cases of Laguerre and Johnson-Mehl for spherical germs. Much better reconstructions can be achieved with these models and thus more realistic microstructure simulations can be produced for materials widely used in industry like martensitic and bainitic steels