Plastic deformation of nanocrystalline Pd–Au was studied by means of atomic-scale computer simulations. The distribution of solutes was equilibrated in model structures of different grain sizes and compositions using a combination of Monte Carlo and molecular dynamics methods. The resulting samples were deformed under uniaxial load. The role of grain boundary solute segregation was analyzed in detail by comparing chemically and structurally relaxed samples with model structures that were only structurally relaxed or reloaded. By analyzing dislocation activity, site occupancy, atomic free volume in the grain boundaries, stacking and twin fault densities, a connection was made between composition-dependent properties of the miscible alloy and the observed stress–strain behavior.

Plastic Deformation of Nanocrystalline Pd–Au Alloys: on the Interplay of Grain Boundary Solute Segregation, Fault Energies and Grain Size. J.Schäfer, A.Stukowski, K.Albe: Acta Materialia, 2011, 59[8], 2957-68