Improving Texture Predictions by Introducing Microstructuraly Based Spin Continuity on Grain Boundaries

R. E. BOLMARO; A.L. FOURTY; J. W. SIGNORELLI

San Diego

Congreso; TMS 140th Annual Meeting & Exhibition; 2011

The Materials Society of USA

Texture evolution predictions are usually assertive on the description of components and general trends but lack a proper quantitative output for their severity. Moreover, if we attempt to rationalize the results in function of modern quantitative experiments describing grain fragmentation and misorientations, the limitations of the models become evident. The current paper presents an implementation of certain rules stemming from continuity of spin on grain boundaries in an FCC polycrystal subject to large deformations. Continuity of spins together with shear stress continuity and strain assumptions on a pair of grains are further used on a Taylor like homogenization scheme.  The main results of experiments, accumulated along the last decade, describing misorientations at fragment boundaries, distribution of misorientations for selected texture components and misorientation evolution vs. deformation are remarkably well reproduced. The model can also give hints on the process of development of dislocation arrays on geometrically necessary dislocation boundaries.