J. Phys. IV France 01 (1991) C4-145-C4-150
MARTENSITIC TRANSFORMATION AND METALLURGICAL STUDY OF LOW TEMPERATURE Cu-Al-Be TERNARY ALLOYS. BELKAHLA1 and G. GUENIN2
1 On leave of absence from University of Annaba, Institut of Physics, BP. 12, Annaba, Algérie
2 Institut National des Sciences Appliquées de Lyon, Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux, ERA CNRS N° 341, Bât 502, 20 Ave. A. Einstein, F-69621 Villeurbanne, France
The present study on a Cu-Al-Be alloy has given the following characteristics : the addition of small concentration of beryllium to the eutectoïdal alloy close to Cu3Al leads to a sharp decrease of the martensitic transformation temperatures. At the same time the composition corresponding to the maximum stability of the beta phase does not change significantly. The eutectoïdal temperature is lowered, but the temperature of beta solution treatment remains the same. Moreover there is no change in the nature of the martensitic transformation (DO3 ↔ 18R). All these properties are very interesting from the industrial point of view : whatever is the Ms temperature chosen, the beta phase stability will be approximately the same since the alloy is always close to the "eutectoïdal" composition. This alloy will be the complement of Cu-Al-Ni alloy towards low transformation temperatures (from -200 °C to +60 °C) with approximately the same stability at high temperature.
© EDP Sciences 1991