Texture induced anisotropy in extruded Ti-6Al-4V-xB alloys

Abstract

The tensile properties of extruded Ti–6Al–4V–xB alloys (wt.%) were evaluated in an orientation perpendicular to the extrusion direction at room-temperature and 455 °C. The extrusion process preferentially oriented the basal plane of α-Ti perpendicular to the extrusion axis. This strong α- phase texture resulted in tensile anisotropy. The tensile strength in the transverse orientation was lower than that in the longitudinal orientation, but it remained greater than that for the ascast Ti–6Al–4V. The TiB phasewas aligned in the extrusion direction and increased B content was found to weaken the α-phase texture, causing a weakening of tensile anisotropy. Debonding was not observed during the tensile tests in the transverse orientation, indicating a strong interface bond exists between the TiB phase and the two-phase (α+β) Ti–6Al–4V matrix.