Study of low-temperature impact deformation behavior of Ti-6Al-4V alloy

The impact behavior of the Ti-6Al-4V alloy has been investigated at varying temperatures (298 K, 223 K, 77 K) in this study. The results reveal a decrease in toughness with reduced temperature, with notable changes in energy distribution between crack initiation and propagation. The {1012}alpha twins formed in the studied sample under impact loading at 298 K and 223 K, and were absent at 77 K. The formation and propagation of twins contribute to the higher toughness of the 298 K and 223 K samples. These findings would provide valuable guidance to optimize the Ti-6Al-4V alloy toughness in low-temperature environments.