Deformation behavior and mechanisms of Ti-1023 alloy

The deformation behavior and mechanisms of Ti-1023 alloy were studied in the temperature range of 650-900 degrees C and strain rate range of 0.001-10 s(-1) by compression and tensile tests. The results show that in a limited strain rate range of 0.001-0.1 s(-1), the kinetic rate equation is obeyed and a linear fit is obtained at all the temperatures. The apparent activation energy is 322 kJ/mol in the alpha-beta region and 160 kJ/mol in the beta region, respectively. Power dissipation maps of this alloy developed by using Gleeble test data show three domains in the tested range. Superplasticity, marked by abnormal elongation at 700 degrees C, occurs in the temperature range of 650-750 C degrees and at strain rates below about 0.03 s(-1). Large grain superplasticity takes place in the temperature range of 750-850 C and strain rates range of 0.001-0.03 s(-1). Dynamic recrystallization occurs in the temperature range of 850-900 degrees C and at strain rates below about 1 s(-1). The instability maps of this alloy were also developed.