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Title: Molecular dynamics simulations of ejecta formation in helium-implanted copper

Abstract

The effect of He concentration and morphology on ejecta production is investigated via molecular dy- namics simulations. Identical He concentrations are inserted into Cu single crystals as interstitial atoms or bubbles near a flat free surface. The resulting ejecta is quantified through total mass, cluster size, and velocity of ejected particles. The presence of He increases total ejected mass as compared to pure Cu; He bubbles produce 56% more mass than atomic He. This increase is attributed to non-planarities in the shock front and reflected pulse due to He bubbles, akin to ejecta resulting from traditional Richtmeyer–Meshkov instabilities.

Authors:
; ORCiD logo; ORCiD logo; ORCiD logo;
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1591978
Alternate Identifier(s):
OSTI ID: 1597350; OSTI ID: 1633892
Report Number(s):
LA-UR-19-27391
Journal ID: ISSN 1359-6462; S1359646219306487; PII: S1359646219306487
Grant/Contract Number:  
89233218CNA000001; NA0003842
Resource Type:
Published Article
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Name: Scripta Materialia Journal Volume: 178 Journal Issue: C; Journal ID: ISSN 1359-6462
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Molecular dynamics; Ejecta; Dynamic behavior

Citation Formats

Flanagan, R. M., Hahn, E. N., Germann, T. C., Meyers, M. A., and Fensin, S. J.. Molecular dynamics simulations of ejecta formation in helium-implanted copper. United States: N. p., 2019. Web. https://doi.org/10.1016/j.scriptamat.2019.11.005.
Flanagan, R. M., Hahn, E. N., Germann, T. C., Meyers, M. A., & Fensin, S. J.. Molecular dynamics simulations of ejecta formation in helium-implanted copper. United States. https://doi.org/10.1016/j.scriptamat.2019.11.005
Flanagan, R. M., Hahn, E. N., Germann, T. C., Meyers, M. A., and Fensin, S. J.. Sat . "Molecular dynamics simulations of ejecta formation in helium-implanted copper". United States. https://doi.org/10.1016/j.scriptamat.2019.11.005.
@article{osti_1591978,
title = {Molecular dynamics simulations of ejecta formation in helium-implanted copper},
author = {Flanagan, R. M. and Hahn, E. N. and Germann, T. C. and Meyers, M. A. and Fensin, S. J.},
abstractNote = {The effect of He concentration and morphology on ejecta production is investigated via molecular dy- namics simulations. Identical He concentrations are inserted into Cu single crystals as interstitial atoms or bubbles near a flat free surface. The resulting ejecta is quantified through total mass, cluster size, and velocity of ejected particles. The presence of He increases total ejected mass as compared to pure Cu; He bubbles produce 56% more mass than atomic He. This increase is attributed to non-planarities in the shock front and reflected pulse due to He bubbles, akin to ejecta resulting from traditional Richtmeyer–Meshkov instabilities.},
doi = {10.1016/j.scriptamat.2019.11.005},
journal = {Scripta Materialia},
number = C,
volume = 178,
place = {United States},
year = {2019},
month = {11}
}

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