LAUSR

Present paper describes the development of microstructure and texture of metastable β titanium alloy Ti–5Al–3.5Mo–7.2V–3Cr in aged condition of β solution-treated and water-quenched (β ST WQ) samples. The β ST WQ samples were aged at different temperatures (550, 650, and 750 °C) and at different aging times (1, 2, and 4 h). The different morphologies of α phase precipitates have been observed during aging of the β ST WQ sample. These are grain boundary α, islands α, sub-boundary α, and uniform distribution of α within prior β grains. The size of the α phase precipitates increases, while volume fractions decrease with increase in aging temperature. The higher aging temperature has reflected the presence of precipitation-free zone (PFZ) within the surrounding area of prior β grain boundaries. The low and high temperatures aging have resulted in sharp {0001} || ND fiber and very weak texture in α phase, respectively. The hardness increases from β ST WQ to all aging temperatures due to precipitation hardening. The specimen aged at 550 °C has resulted in maximum hardness as a result of precipitation of fine α phase precipitates.