. . . . . . . . . .    ANM 2010     3rd International Conference on Advanced Nano Materials     12-15 September 2010 - Agadir, Morocco Back    Abstract ANMM208 DEFORMATION AND FAILURE MECHANISMS IN NANOSCALE MULTILAYER METALLIC COMPOSITES Hussein M. Zbib, Ioannis Mastorakos, David F. Bahr School of Mechanical and Materials Engineering Washington State University . Recent studies have shown that nanoscale metallic multilayered (NMM) composites exhibit an unusually superior properties, making them candidates for significant technological impact. Besides their ultra high strength (on the order of GPa), high ductility, and morphological stability at elevated temperatures, NMM exhibit high fatigue and radiation damage resistance. From a scientific point of view, the lack of full understanding of dislocation-dislocation and dislocation-interface interactions at the nanoscale/constraints and their contribution to the observed response presents a challenging problem. Previous experimental and theoretical studies have examined bimetallic NMM composites and noted the imapct of interfacial strength and stresses on dislocation motion. In this work, we use a multiscale modeling approach combined with biaxial loading experiments to study deformation and failure mechanisms under cyclic loading in trimetallic NMM composites comprising hybrid coherent/incoherent interfaces, which provides additional flexibility in the design of new material systems. . © nanoAC . . . . . . . . . .

.