Susceptibility to Adiabatic Shear Band of Tungsten Heavy Alloy Fabricated through Hot-Hydrostatic Extrusion and Cold Torsion

Liquid phase sintered 93W-4.5Ni-2.1Fe-0.35Co tungsten alloy was prepared by hot-hydrostatic extrusion (HE) to obtain fibrous microstructure, followed by cold torsion(CT) to modulate the fiber direction. The dynamic mechanical properties and susceptibility to adiabatic shear band (ASB) of the tungsten heavy alloy (WHA) deformed by the HE&CT were systematically investigated. Results show that the HE&CT process can evidently improve the dynamic yielding strength and susceptibility to ASB. Microstructure analyses reveal that the micro-stress states of tungsten fibers and the distribution of the binder phase changing with fibrous orientations were accounted for the high susceptibility to ASB.