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Cecelia Jones - Center Manager
Summary Sentence: Stephen Foiles, distinguished staff professional in the Computational Materials & Data Science Dept. at Sandia National Labs in Albuquerque, NM is presenting a talk on alloy stabilization of nanocrystals.
Stephen FoilesComputational Materials & Data Science Dept. Sandia National Laboratories, Albuquerque, NM
Abstract
Nanocrystalline metals with grain sizes less than ~100 nm are of great interest due to their attractive mechanical properties compared to conventional grain scale counterparts. However, the highly non-equilibrium nature of these metals leads to instability to grain growth and thus the loss of the desirable properties. Several studies have shown that the nanocrystalline grain size can be stabilized by appropriate alloying. Multiple mechanism for this stabilization have been proposed including thermodynamic arguments based on the reduction of grain boundary energy due to segregation and kinetic arguments based on particle pinning or the modification of grain boundary mobility due to alloy segregation. This talk will discuss on-going efforts to employ a variety of simulation and experimental approaches to help unravel the relative role of these influences in model alloy systems.
Biography
Stephen Foiles is a Distinguished Member of Technical Staff at Sandia National Laboratories in the Computational Materials and Data Science department. He received a BS in Physics from Stanford University in 1978 and a PhD in Theoretical Physics from Cornell University in 1983. After graduation, he joined the technical staff at Sandia first at the CA site and later transferred to the NM site. His research focuses on the development and application of atomic-scale simulation methodologies, the application of these methods to the study of defects and interfaces, and the connection of these studies with mesoscale materials descriptions of materials processing and performance. He is a fellow of the Institute of Physics and the American Physical Society.
Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000.
