Molecular dynamics simulations of ejecta formation in helium-implanted copper

Journal Article · 16 November 2019 · Scripta Materialia

DOI: https://doi.org/10.1016/j.scriptamat.2019.11.005 · OSTI ID:1591978

Flanagan, Rachel Marie ^[1]; Hahn, Eric Nicholas  ^[2]; Germann, Timothy Clark  ^[3]; Meyers, M. A.  ^[4]; Fensin, Saryu Jindal  ^[3]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, San Diego, CA (United States)
2. Univ. of California, San Diego, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
4. Univ. of California, San Diego, CA (United States)

The effect of He concentration and morphology on ejecta production is investigated via molecular dynamics 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.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Univ. of California, San Diego, CA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: 89233218CNA000001; NA0003842
• OSTI ID: 1591978
• Alternate ID(s): OSTI ID: 1597350; OSTI ID: 1633892
• Report Number(s): LA-UR-19-27391
• Journal Information: Scripta Materialia, Vol. 178, Issue C; ISSN 1359-6462
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English