ABSTRACT
Hot workability characteristics and microstructural evolution of Ti-10V-2Fe-3Al alloy
have been investigated extensively by means of hot compression tests over a
practical range of temperatures from 760°C to 870ºC with strain rates (0.01, 0.1, and
1) s-1. Activation energy was obtained (using the peak stress values) to determine
the material constants and subsequent Zener-Holloman parameter. The dependence
of peak stress on the deformation temperature and strain rate obeys a hyperbolic
sine equation with the Zener- Holloman parameter. The results show that higher
activation energy was observed at a temperature of 800°C. Microstructural
observations of the deformed samples show elongated grains with a recovered
structure at lower temperatures. However, recrystallized grains were observed
obviously at 810°C, 850°C and 870°C, at a strain rate of 1s-1. Furthermore, there
was a gradual increase in the fraction of recrystallized grains as the deformation
temperature increased at higher strain rate. Fracture behaviour during hot
compression test was also investigated optically in terms of surface cracks at
different deformation conditions. In terms of this damage behaviour, surface cracks
were observed at 760°C with higher strain rate1s-1.