Adiabatic shear banding of hot-extruded tungsten heavy alloy under cryogenic temperature

The effect of cryogenic temperature on adiabatic shear banding (ASBing) of tungsten heavy alloy (WHA) processed by hot-hydrostatic extrusion was investigated. Results show that, when the initial temperature is decreased, the dynamic flow stress, the critical failure time, and the dynamic failure energy of specimens show an increasing tendency, while the susceptibility to ASB of WHA shows a decreasing tendency, which is characterized by decreased shear strain and increased width of shear bands. Microstructure analysis shows that the number of microcracks within ASB exhibits an increasing tendency with decreased initial temperature, and the dynamic recrystallization (DRX) process within ASB is evidently suppressed at the lower temperature. As a result of the lower temperature, the motion and rearrangement of dislocation are effectively suppressed, which is mainly responsible for the incomplete DRX process within ASB and decreases susceptibility to ASB.