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Low cycle fatigue (LCF) tests were carried out on Ti6Al4V alloy at room temperature for different strain amplitudes ranging from 0.5% to 2%. The microstructure and texture evolutions as a function of strain amplitude have been investigated in the present study. Cyclic softening behaviour was observed at all strain amplitudes, and it was found to increase with increasing the strain amplitude. The fatigue transition life was observed to be at 1.25% strain amplitude. Onlytype tensile twins were formed during the deformation, and this was found to be significant at higher strain amplitude of 2%. The grains alongwere appeared to be the twinning parent, and the twinned products were appeared along [0001]. Thegrains were further found to have substantial cyclic deformation than the other grains, such asand [0001]. The dominant texture was found alongduring the LCF tests. However, the sample at higher strain amplitude of 2% had also prominent [0001] texture along withtexture. Fractographic examination revealed a dimple fracture surface at lower strain amplitude (0.5%), whereas a quasi-cleavage type fracture was observed at higher strain amplitudes (1% &amp; 2%).

Role of crystallographic orientation on the deformation behaviour of Ti-6Al-4V alloy during low cycle fatigue