Structure and Transformations of Metastable Phases in Zr-Nb and Ti-V alloys

CUELLO, G. J.; AURELIO, G.; A. FERNÁNDEZ GUILLERMET; CAMPO, J.

Munich

Conferencia; International Neutron Scattering Conference (INSC 2001); 2001

An experimental study is presented of the effect of an isothermal heat treatment (‘aging’) upon the structural properties of three metastable phases in Zr–Nb and Ti–V alloys, viz. α (hcp), β (bcc) and Ω, formed by quenching the alloys from 1273 K. Using neutron-diffraction experi-ments, the constitution of the aged alloys and the structural parameters of the resulting aged phases were determined. By combining lattice-parameter measurements with previouslyestablished correlations in the Zr–Nb and Ti–V systems, new information on the composition of the aged phases was obtained. For long aging times the α and β phases seem to be approaching equilibrium conditions, which opens up the possibility of using quenching-and-aging experiments to gain insight into the metastable phase diagram of these systems, which is not accurately known from experiments.