Fracture failure behavior and dynamic recrystallization of pure tungsten under deformation at ultra-high strain rates
CHEN Xun, HUANG Yufeng, ZHANG Lei, CHEN Boshan, LIU Wensheng, MA Yunzhu
National Key Laboratory of Science and Technology for National Defense on High-strength Structural Materials, Central South University, Changsha 410083, China
Abstract：The laser shock loading technique was used to achieve dynamic load on powder metallurgy sintered and molten tungsten at ultra-high strain rates. Polycrystalline tungsten’s damage characteristics and microstructure were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). And the effects of holes on the failure behavior and dynamic recrystallization (DRX) mechanism of polycrystalline tungsten was investigated. The results show that fracture along the grain still dominates the failure mode of polycrystalline tungsten at ultra-high strain rates. Holes at grain boundaries and inside grains become the origin of fracture failure of the material under dynamic loading. The reflection of shock waves by the holes causes a continuous concentration of stress around the holes. Many dislocations form and tangle, resulting in a rapid increase in deformation storage energy. Sintered tungsten exhibits numerous equiaxed recrystallization after shock loading at higher shock pressure. The degree of recrystallization decreases as the shock wave decays with thickness.
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2022, Vol. 27 
