RECENT ADVANCES IN MODELING POLYCRYSTALS WITH COMPLEX MICROSTRUCTURES

This paper presents recent advances in modelling mechanical behavior o f polycrystalline materials having some kind of spatial correlation be tween neighbour crystals, In the case of a lamellar (alpha + beta) all oy, we use a 2-site viscoplastic selfconsistent (VPSC) model to show t hat the correlation between phases has a relevant influence on texture development. In the case of a TiAl intermetallic, we consider a stack ing sequence of lamellar twins deforming as an ensemble. This leads to a local constitutive behavior different from the one expected for a s ingle crystal and, therefore, gives a different plastic response at ma croscopic level. (C) 1997 Elsevier Science B.V.