Abstract
Heat-treated Ti-6Al-4V alloy with three different microstructures was dynamically deformed at a varied temperature range (up to 450 °C). The specimens deformed with 1 and 102 s−1 strain rates at 300 °C show extensive shear banding. Formation of dendritic structure has been observed inside highly strained shear bands. Furthermore, the fracture surface of sheared samples exhibits spherical particles sticking to the surface. Compositional analysis using EDS depicts these structures as close to the overall alloy composition with considerable solute segregation in spherical particles. The reason behind such observation has been described as localized melting of the alloy due to a sudden burst of strain energy during fracture and interface friction between delaminated grains. The temperature rise calculated within the ASB, based on its fraction, predicts a temperature beyond the alloy's melting point.
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