A new way to include the grain shape in texture simulations with the Taylor model
The use of the Hall-Petch relation in texture simulations with the Taylor-Bishop-Hill model is proposed as a mean to take into account grain shape effect. The results are compared with those obtained with the usual and relaxed constraint Taylor model for a simple texture and the consequences for the anisotropy coefficient are investigated On propose d'utiliser la relation de Hall-Petch dans les simulations de texture a l'aide du modele de Taylor-Bishop-Hill pour prendre en compte la forme des grains. Comparaison des resultats avec ceux du modele de Taylor classique ou relaxe dans le cas d'une texture simple; consequences pour le coefficient d'anisotropie
Coupled effects of grain size distributions and crystallographic textures on the plastic behaviour of IF steels
Abstract Micro–macro scale transition theories were developed to model the inelastic behaviour of polycrystals starting from the local behaviour of the grains. The anisotropy of the plastic behaviour of polycrystalline metals was essentially explained by taking into account the crystallographic textures. Issues like plastic heterogeneities due to grain size dispersion, involving the Hall–Petch mechanism at the grain scale, were often not taken into account, and, only the role of a mean grain size was investigated in the literature. Here, both sources of plastic heterogeneities are studied using: (i) experimental data from EBSD measurements and tensile tests, and, (ii) a self-consistent model devoted to elastic–viscoplastic heterogeneous materials. The results of the model are applied to two different industrial IF steels with similar global orientation distributions functions but different mean grain sizes and grain size distributions. The coupled role of grain size distributions and crystallographic textures on the overall tensile behaviour, local stresses and strains, stored energy and overall plastic anisotropy (Lankford coefficients) is deeply analyzed by considering different other possible correlations between crystallographic orientations and grain sizes from the measured data.
On the Orientation Changes during Plastic Deformation of Individual Crystallites in Polycrystalline Aggregates
The orientation changes of individual crystallites in aluminium wires were studied during 1% plastic deformation. The crystals near the [111]-ideal orientation rotated towards this orientation according to the Taylor theory. The crystals of the weak [100]-texture component showed no resulting rotation component towards [100] in contradiction to the Taylor theory. 
 
 
 
Die Orientierungsanderungen individueller Kristallite von Aluminiumdrahten nach 1% plastischer Verformung wurden untersucht. Die Kristallite nahe der Ideallage [111] drehen sich auf diese Lage zu in Ubereinstimmung mit der Taylor-Theorie. Die Kristalle der schwachen [100]-Texturkomponente zeigen keine resultierende Drehkomponente in Richtung auf die Ideallage im Widerspruch zur Taylor-Theorie.