Volume 57, Number 1, January 2002
|Page(s)||74 - 79|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Aubry transition in a real material: Prediction for its existence in an incommensurate gold/gold interface
Département de recherche fondamentale sur
la matière condensée
SP2M, CEA-Grenoble - 38054 Grenoble Cedex 9, France
Corresponding author: FLancon@cea.fr
Accepted: 15 October 2001
Recent studies have shown that a special grain boundary in gold is stable and is an incommensurate interface related to the irrational number . Using the theoretical framework of quasicrystals, we show that this system can undergo an Aubry transition: the two grains can glide freely along the ideal interface; if we increase the interactions between the grains by applying a compression perpendicular to the interface, there is a threshold after which the grains are pinned to each other. With a numerical analysis of the energy landscape corresponding to the shift of the grains, we determine the atomistic mechanism of the grain sliding.
PACS: 61.72.Mm – Grain and twin boundaries / 61.44.Fw – Incommensurate crystals / 62.20.Qp – Tribology and hardness
© EDP Sciences, 2002
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