Mechanical characteristics, failure regularities, and dimple structures on failure surfaces of Ti–6Al–4V ‘ELI’ ultrafine-grained alloy at temperatures from 300 to 4.2 K

Low temperature mechanical characteristics in quasistatic uniaxial tension and compression have been studied for ultrafine-grained structural states of Ti–6Al–4V ELI (extra-low interstitials content) alloy processed by equal channel angular pressing. Values of the yield stress and the uniform strain at 300, 77, and 4.2 K have been compared for structural states of the Ti–6Al–4V ELI alloy that differ in the average grain size and morphology of α and β phases. Microstructural regularities of failure surfaces and statistical distributions of dimple sizes on the failure surfaces have been studied for different structural states and temperatures.