Statistical mechanics of kinks on a gliding screw dislocation

Boleininger, Max; Gallauer, Martin; Dudarev, Sergei L.; Swinburne, Thomas D.; Mason, Daniel R.; Perez, Danny

doi:10.1103/physrevresearch.2.043254

Statistical mechanics of kinks on a gliding screw dislocation

Journal Article · Tue Nov 17 23:00:00 EST 2020 · Physical Review Research

DOI:https://doi.org/10.1103/physrevresearch.2.043254· OSTI ID:1807835

Boleininger, Max ^[1]; Gallauer, Martin ^[2]; Dudarev, Sergei L. ^[1]; ^[3]; Mason, Daniel R. ^[1]; ^[4]

UK Atomic Energy Authority Research Group, Abingdon (United Kingdom). Culham Lab.
Univ. of Oxford (United Kingdom)
Aix-Marseille Univ., Marseille (France)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The ability of a body-centered-cubic metal to deform plastically is limited by the thermally activated glide motion of screw dislocations, which are line defects with a mobility exhibiting complex dependence on temperature, stress, and dislocation segment length. We derive an analytical expression for the velocity of dislocation glide, based on a statistical mechanics argument, and identify an apparent phase transition marked by a crossover temperature above which the activation energy for glide effectively halves, changing from the formation energy of a double kink to that of a single kink. The analysis is in quantitative agreement with direct kinetic Monte Carlo simulations.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; European Research Council (ERC); Engineering and Physical Sciences Research Council (EPSRC)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1807835

Report Number(s):: LA-UR--20-23814

Journal Information:: Physical Review Research, Journal Name: Physical Review Research Journal Issue: 4 Vol. 2; ISSN 2643-1564

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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