This article is cited in 53 papers

Mechanical properties, strength physics and plasticity

Resistance to dynamic deformation and fracture of tantalum with different grain and defect structures

S. V. Razorenov^a, G. I. Kanel'^b, G. V. Garkushin^a, O. N. Ignatova<sup>c

a</sup> Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia
^b Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow
^c Federal State Unitary Enterprise "Russian Federal Nuclear Center — All-Russian Research Institute of Experimental Physics", Sarov, Nizhny Novgorod region

Abstract: This paper presents the results of measurements of the strength properties of technically pure tantalum under shock wave loading. It has been found that a decrease in the grain size under severe plastic deformation leads to an increase in the hardness of the material by approximately 25%, but the experimentally measured values of the dynamic yield stress for the fine-grained material prove to be less than those of the initial coarse-grained specimens. This effect has been explained by a higher rate of stress relaxation in the fine-grained material. The hardening of tantalum under shock wave loading at a pressure in the range 40–100 GPa leads to a further increase in the rate of stress relaxation, a decrease in the dynamic yield stress, and the disappearance of the difference between its values for the coarse-grained and fine-grained materials. The spall strength of tantalum increases by approximately 5% with a decrease in the grain size and remains unchanged after the shock wave loading. The maximum fracture stresses are observed in tantalum single crystals.

Received: 19.09.2011

 English version: Physics of the Solid State, 2012, 54:4, 790–797

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