High-Strain, High-Strain Rate Deformation, Shear Localization and Recrystallization in Tantalum

Y. Chen , J. Lasalvia , V. Nesterenko , M. Meyers , M. Bondar , Y. Lukyanov

Tantalum tubular specimens, embedded in copper thick-wall cylinders, were collapsed quasi-uniformly by detonating the explosive in co-axial with the copper cylinder. The microstructure featured : (i) dislocations and elongated dislocation cells ; (ii) subgrains ; (iii) dynamically recrystallized micrograins ; and (iv) statically recrystallized grains whose grain sizes were predicted using conventional grain-growth kinetics. The evolution mechanism of the microstructure from elongated dislocation cells, subgrains, to micrograins is proposed. Grain-scale localization was observed. Ductile fracture along shear bands was produced by the residual tensile hoop stresses near the central hole region upon unloading.

Domaines: Articles anciens

Y. Chen, J. Lasalvia, V. Nesterenko, M. Meyers, M. Bondar, et al.. High-Strain, High-Strain Rate Deformation, Shear Localization and Recrystallization in Tantalum. Journal de Physique IV Proceedings, 1997, 07 (C3), pp.C3-435-C3-440. ⟨10.1051/jp4:1997375⟩. ⟨jpa-00255532⟩