Research on heat treatment of TiBw/Ti6Al4V composites tubes

Heat treatment with different parameters were performed on the hot-hydrostatically extruded and swaged 3.5. vol.% TiBw/Ti6Al4V composites tubes. The results indicate that the primary α phase volume fraction decreases and transformed β phase correspondingly increases with increasing solution temperatures. The α. +. β phases will grow into coarse α phases when the aging temperature is higher than 600. °C. The hardness and ultimate tensile strength of the as-swaged TiBw/Ti6Al4V composite tubes increase with increasing quenching temperatures from 900 to 990. °C, while they decrease with increasing aging temperatures from 550 to 650. °C. A superior combination of ultimate tensile strength (1388. MPa) and elongation (6.1%) has been obtained by quenching at 960. °C and aging at 550. °C for 6. h. High temperature tensile tests at 400-600. °C show that the dominant failure modes at high temperatures also differ from those at room temperature.