Effects of Strain Rate on Mechanical Properties and Microstructure of V-5Cr-5Ti Alloy
In this work the static and dynamic tensile properties of vanadium alloy V-5Cr-5Ti were investigated at strain rates ranged from 3.3x10-5/s to 1.2x102/s. The material microstructures were analyzed using optical microscope, SEM, TEM, XRD and EDS. Results show that the yield strength a increases with strain rate. The brittle-ductile transition strain-rate is about 101/s to102/s. At room temperature the tensile fracture at a low strain rate occurs via mixed modes of microvoid aggregating and transgranular cracking; at high strain rate the fracture occurs via a brittle mode. The analysis by TEM, XRD and EDX shows the existence of lath martensite, and on there exits precipitate phase of Ti(O,C, N) in grain boundaries.
Jian-Feng Nie and Allan Morton
W. J. Hu et al., "Effects of Strain Rate on Mechanical Properties and Microstructure of V-5Cr-5Ti Alloy", Materials Science Forum, Vols. 654-656, pp. 2535-2538, 2010