The Effect of Defects on the Shock Hugoniot of Tantalum

Hahn, Eric Nicholas; Fensin, Saryu Jindal

doi:10.1063/1.5096526

Title: The Effect of Defects on the Shock Hugoniot of Tantalum

Journal Article · 06 June 2019 · Journal of Applied Physics

DOI: https://doi.org/10.1063/1.5096526 · OSTI ID:1657126

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Using molecular dynamics simulations, we investigate the effect of vacancies and dislocations on the dynamic response of single crystal tantalum to shock loading along the $$\langle$$110$$\rangle$$ axis. A Hugoniostat technique is employed, for which a series of states along the Hugoniot are sampled by many individual simulations. We show that defects have a limited effect on the shock/particle velocity relationship and that the shock pressure/volume relationship can be well predicted by taking into account the changes in the initial density and sound speeds of the samples. The principal effect of initial defects is the activation of heterogeneous dislocation nucleation and expedited dislocation multiplication during shock. The heat generated by plastic work, caused by defects moving through the lattice, is substantial. The result is significantly divergent final shock temperatures for different initial defect concentrations and pronounced changes in the resultant shock melting temperatures. The motion of dislocations also leaves behind a noninconsequential concentration of vacancies that is quantified.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: 89233218CNA000001; LDRD-2017033DR

OSTI ID:: 1657126

Alternate ID(s):: OSTI ID: 1525509

Report Number(s):: LA-UR-19-22111; TRN: US2203803

Journal Information:: Journal of Applied Physics, Vol. 125, Issue 21; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 22 works

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Title: The Effect of Defects on the Shock Hugoniot of Tantalum

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