Title: X-ray diffraction from shock driven Sn microjets

Abstract

Here, in situ x-ray diffraction was performed on shock-generated microjets composed of Sn and Sn–4Ag. Under low pressure drives (~21 GPa), a significant fraction of the jet volume was found to be in the β-Sn phase, and these crystallites were much smaller than the initial grain size of the material. Significant quantities of amorphous (molten) material were observed for higher drive pressures (~25–35 GPa). The extent of melting at these pressures was greater than would be predicted for uniaxial shock loading. Diffraction patterns from the Sn–4Ag alloy showed a peak that is consistent with the expected Ag₃Sn intermetallic phase. This peak remained evident under drive conditions where the sample was otherwise fully amorphous. This indicates a slushy or a mixed phase of liquid Sn and solid Ag₃Sn. Given the eutectic character of this alloy, this observation is attributed to a kinetic limitation on the dissolution of Ag₃Sn. This implies that a much broader range of drive conditions will lead to mixed phase jets and ejecta than would be predicted from the equilibrium melt boundary of such alloys.

Authors:

Bober, David B.  ^[1];

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• Search DOE PAGES for ORCID "0000-0003-1608-781X"

Lind, Jonathan  ^[1];

• Search DOE PAGES for author "Lind, Jonathan"
• Search DOE PAGES for ORCID "0000-0001-6406-0617"

Saunders, Alison M.  ^[1];

• Search DOE PAGES for author "Saunders, Alison M."
• Search DOE PAGES for ORCID "0000-0002-8938-0593"

Akin, Minta C.  ^[1]

• Search DOE PAGES for author "Akin, Minta C."
• Search DOE PAGES for ORCID "0000-0001-5742-8663"

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+ Show Author Affiliations

1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Publication Date:

Tue Nov 08 00:00:00 EST 2022

Research Org.:

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)

OSTI Identifier:

1959523

Alternate Identifier(s):

OSTI ID: 1897563

Report Number(s):

LLNL-JRNL-836081
Journal ID: ISSN 0021-8979; 1054930; TRN: US2313206

Grant/Contract Number:  

AC52-07NA27344; AC02-06CH11357; NA0002442

Resource Type:

Accepted Manuscript

Journal Name:

Journal of Applied Physics

Additional Journal Information:

Journal Volume: 132; Journal Issue: 18; Journal ID: ISSN 0021-8979

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE; shock wave experiments; x-ray diffraction; hydrodynamics; phase transitions; flow instabilities; shock compression; fluid jets