Matériaux pour les machines thermiques
J. Phys. IV France 10 (2000) Pr4-223-Pr4-228
Study of Ti-48Al alloy : Effect of cooling rate, mechanical propertiesF. Perdrix, M.-F. Trichet, J.-L. Bonnentien, M. Cornet and J. Bigot
Centre d'Études de Chimie Métallurgique, CNRS, 15 rue Georges Urbain, 94407 Vitry-sur-Seine cedex, France
The microstructure of a Ti-48Al alloy solution treated in the α-field is influenced by the cooling rate. The study of cooling curves permit us to determine expenmentally the CCT diagram, and to show that the higher the cooling rate the lower is the temperature of the α → γ transformation start. The evolution of parameters that characterise the lamellar structure has been determined according to the cooling rate. When this one increases, α2-volume fraction increases, width of α2 and interlamellar spacing decrease. The values of yield stress also increased and were all the less scattered as the structure became more perfectly lamellar.
© EDP Sciences 2000