AVS 63rd International Symposium & Exhibition
    Advanced Surface Engineering Tuesday Sessions
       Session SE+NS+TF+TR-TuM

Paper SE+NS+TF+TR-TuM4
Is Intrinsic Nanocrystalline Stability Practically Achievable? Insights from Investigations with Pt-Au Alloys

Tuesday, November 8, 2016, 9:00 am, Room 101C

Session: Nanostructured Thin Films and Coatings
Presenter: Nicolas Argibay, Sandia National Laboratories
Authors: N. Argibay, Sandia National Laboratories
T.A. Furnish, Sandia National Laboratories
D.P. Adams, Sandia National Laboratories
P. Lu, Sandia National Laboratories
M. Chandross, Sandia National Laboratories
M.A. Rodriguez, Sandia National Laboratories
B.L. Boyce, Sandia National Laboratories
B.L. Clark, Sandia National Laboratories
M.T. Dugger, Sandia National Laboratories
Correspondent: Click to Email
The existence of intrinsic thermodynamically stable nanocrystalline binary metal alloys has been proposed recently, supported by some notable demonstrations of stability through annealing of powders. There is a great deal of interest in understanding the impact of stress on this stability. In this presentation we present results of an investigation on the stress and temperature dependent nanocrystalline stability of a noble-metal alloy (Pt-Au) in the form of sputter co-deposited thin films. In situ XRD and TEM annealing revealed an extraordinary degree of thermal stability, confirming literature predictions. Tribological experiments and molecular dynamics simulations were used to further explore the impact of stress as a destabilizing factor.