Limiting velocities and transonic dislocations in Mg

Dang, Khanh Quoc; Blaschke, Daniel N.; Fensin, Saryu Jindal; Luscher, Darby Jon

doi:10.1016/j.commatsci.2022.111786

Limiting velocities and transonic dislocations in Mg

Journal Article · Mon Oct 03 00:00:00 EDT 2022 · Computational Materials Science

DOI:https://doi.org/10.1016/j.commatsci.2022.111786· OSTI ID:1893681

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

To accurately predict the mechanical response of materials, especially at high strain rates, it is important to account for dislocation velocities in these regimes. Under these extreme conditions, it has been hypothesized that dislocations can move faster than the speed of sound. However, the presence of such dislocations remains elusive due to challenges associated with measuring these experimentally. In this work, molecular dynamics simulations were used to investigate the dislocation velocities for the basal edge, basal screw, prismatic edge, and prismatic screw dislocations in Mg in the sub-, trans-, and supersonic regimes. Also, our results show that only prismatic edge dislocations achieve supersonic velocities. Furthermore, this work demonstrates that the discrepancy between the theoretical limiting velocity and the MD results for Mg is due to its sensitivity to large hydrostatic stress around the dislocation core, which was not the case for fcc metals such as Cu.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1893681

Report Number(s):: LA-UR-22-22557

Journal Information:: Computational Materials Science, Journal Name: Computational Materials Science Vol. 215; ISSN 0927-0256

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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