Dynamic torsional behavior of tungsten heavy alloys fabricated by mechanical alloying

摘要

Dynamic torsional behavior of tungsten heavyalloys fabricated by mechanical alloying was investigated in orderto evaluate the possibility of the adiabatic shear band formation.Dynamic torsional tests were conducted for tungsten alloyspecimens fabricated with different sintering temperatures aftermechanical alloying, and then the test data were compared withthose of a conventionally processed specimen. The refinement oftungsten particles could be obtained after mechanical alloying,although contiguity, i.e., volume fraction of the interfacial areabetween tungsten particles, was seriously increased, therebyleading to very low ductility and impact energy. The dynamic testresults indicated that interfacial fracture between tungsten particlesoccurred over broad deformed areas in these specimens, expectingthe low possibility of the shear band formation. However,application of partial mechanical alloying was effective in theshear band formation since a wide matrix pool acted as a site oflocalized deformation. These findings suggested that the idea ofmaking matrix pools by partial mechanical alloying would beuseful for improving the penetration performance of tungsten heavy alloys.