Chemo-elastic equilibrium in nanocrystalline Pd-Au-H

We present an experimental study of the hydrogen solubility in nanocrystalline Pd-Au. Hydrogen enrichment and depletion at grain boundaries results in a strongly size dependent interface stress, which is compensated by a pressure in the bulk. We determine the interface stress and the pressure as a function of the hydrogen concentration in the bulk from data for the macroscopic strain and for the change in lattice constant upon alloying. (C) 2001 Acm Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.