Anisotropy in the tensile behaviour of Ti-6Al-2Sn-4Zr-6Mo alloy

Tensile properties were evaluated for a Ti-6Al-2Sn-4Zr-6Mo alloy forged, in the P state age-hardening state and further double ageing treatment. Since this alloy tends to exhibit a strong anisotropy in the mechanical behaviour, the study has been realized in the radial and tangential direction relative to the forging axis. An anomalous tendency was observed in the tensile test, characterised by low yield strength and a high ductility in the radial direction. This effect was analyzed by transmission electron microscopy and X-ray diffraction. The phase transformation to martensite induced by deformation, the mechanical deformation by twinning and the presence of a-phase along the grain boundary of the colonies (b-prior) are the reasons for this anomalous tendency.