Elasticity moduli of Ti-Mo alloys at low temperatures

The young and shear moduli and Poisson coefficient of Ti-Mo alloys with molybdenum content from 0.1 to 40% have been determined in the temperature range from 80 to 300 K. It is shown that for molybdenum concentrations in the range from 5 to 30 wt.% the heat treatment has a strong effect on elasticity modulus. This is due to changes in the phase composition of alloy. At 0.7-0.8% Mo, the α phase becomes stabilized when the hexagonal close-packed lattice of α titanium is strained, which causes reduction of the elasticity modulus. Appearance of the β phase decreases elasticity modulus. Appearance of the ω-phase is responsible for the increased modulus in the 5-10 wt.% Mo range. Measuring the elasticity modulus variation in the Ti-Mo alloys permits to investigate the stability of these alloys and their phase composition