Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-527-C7-531
Decomposition of β-metastable phase in β-Cez alloy during continuous heatingR. SANGUINETTI, M. ZANDONA, A. PIANELLI and E. GAUTIER
Laboratoire de Science et Génie des Matériaux Métalliques, URA 159 du CNRS, Ecole des Mines, Parc de Saurupt, 54042 Nancy cedex, France
The decomposition of the metastable [MATH] phase in [MATH] Cez alloy has been studied during continuous heating up to 830°C. The heating rate varied between 0.25 and 5°C/s. Electric resistivity measurements, and hardness measurements revealed different phase transformations as temperature increased. Different samples were quenched from different temperatures during the heating range and were then studied by X-ray and TEM, allowing to correlate the changes in resistivity measurements to the beginning of the precipitations of the [MATH]and [MATH] phases and to establish the continuous heating transformation diagram. A change in the resistivity variations, not dependent on the heating rate was observed near 700°C. X-ray quantitative analysis and EAM studies revealed that the structure consisted of [MATH] maximal content of [MATH] phase, surrounded by [MATH] rich zones in the matrix. For temperatures greater than 700°C, the content of [MATH] phase diminished and the [MATH] phase was homogenized.
© EDP Sciences 1993