CHANGEMENTS DE PHASES ET MICROSTRUCTURES
J. Phys. IV France 04 (1994) C3-99-C3-104
Décomposition de la phase β-métastable de l'alliage de titane β-Cez au cours du chauffage et du recuitR. SANGUINETTI, M. ZANDONA, A. PIANELLI and E. GAUTIER
Laboratoire de Science et Génie de Matériaux Métalliques, URA 159 du CNRS, Ecole des Mines, Parc Saurupt, 54042 Nancy cedex, France
This work carries out the study of the precipitation during continuous heating up to 830°C and ageing at this same temperature from β meta + w aniso or β meta + α. The heating rates varied between 0.25 and 5°C/s. The transfomations were followed by electric resistivity and hardness measurements. Different samples were quenched from different temperatures during the heating range and were then studied by X-ray and TEM. The beginning temperatures of precipitations of the w and α phases were established, as the continuous heating transformation diagrams. Near 700°C, X-ray quantitative analysis and EAM studies revealed ( for quenching and 4.5°C/s cooling rate) that the structure consisted of a maximum content of the α phase, surrounded by β zones enriched in Fe, Cr. For temperatures greater than 700°C, the content of the α phase diminished and the β phase composition was homogenized.
© EDP Sciences 1994