Influence of thermo-mechanical processing on microstructure and mechanical property of Ti-1023 alloy

The effect of thermo-mechanical processing on microstructure and property of Ti-1023 titanium alloy was studied in this paper. Based on the investigation, a better thermo-mechanical processing was obtained. The results show that, during low-temperature (300°C) aging, transitional ω-phase is precipitated, providing a high density of nucleation sites for the secondary α phase, so uniformly distributed α laths are obtained by two-step aging. During hot rolling, β grains are refined and defects are generated. The defects assist the nucleation of secondary α phase during aging. Therefore the strength and plasticity of Ti-1023 alloy are improved by the combined action of two-step aging and hot rolling. After deformation (deformation temperature and deformation reduction are 845°C and 45%, respectively) and two-step aging (300°C/8 h+500°C/16 h), the microstructure of Ti-1023 alloy is refined which results in a finer strength and plasticity match.