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J. Phys. IV France
Volume 11, Numéro PR10, Décembre 2001
Journées d'Étude des Équilibres entre Phases
Page(s) Pr10-103 - Pr10-107
Journées d'Étude des Équilibres entre Phases

J. Phys. IV France 11 (2001) Pr10-103-Pr10-107

DOI: 10.1051/jp4:20011014

Phase transitions in AU0.5Cu0.5

M. Guymont1, Y. Feutelais2 and B. Legendre2

1  Métallurgie Structurale, bâtiment 410, Université Paris XI, 91405 Orsay, France
2  Laboratoire de Chimie Physique Minérale et Bioinorganique, EA 401, Faculté de Pharmacie, 5 rue J.-B. Clément, 92296 Châtenay-Malabry, France

After having recalled the crystal structures of the three equilibrium phases of stoichiometric Au0.5Cu0.5 alloy, new results are presented in the frame of a general discussion on the transition series (with increasing temperature) :
AuCu I(LI0) → AuCu II → disordered AuCu (Al).
Both transitions have been followed by in-situ temperature X-ray, confirming earlier electron diffraction studies, and their transition enthalpies have been measured by differential scanning calorimetry. These results are commented, and a possible explanation for the large two-phase hysteresis (35°C) is proposed.

© EDP Sciences 2001