Temperature-dependence of mechanical properties of open-cell titanium foam

An open-cell titanium foam with relative density of 0.2 was prepared by powder metallurgical process. The compressive mechanical properties of the foam at the different temperatures in the range of 20-600°C were measured and the temperature-dependence of its mechanical properties was discussed. The results indicate that the foam material exhibit fragile fracture characteristic at room temperature. When it is deformed over 200°C, the stress-strain curves exhibit plastic deformation characteristic, including three distinct regions: the linear elasticity region, the plastic collapse region, and the densification region. The Young's modulus, yield stress and elastic limit decrease with increasing of temperature. The temperature-dependence of these properties can be expressed as E*=1.5217 × 10 9-5.988 × 10 5T, σ cl*=85.7-0.095T, σ ys*=99.1-0.167V7.02 × 10 -5T 2 respectively.