Shock melting and the hcp-bcc phase boundary of Mg under dynamic loading

Beason, Matthew Thomas; Jensen, Brian J.; Crockett, Scott D.

doi:10.1103/physrevb.104.144106

Shock melting and the hcp-bcc phase boundary of Mg under dynamic loading

Journal Article · Wed Oct 13 00:00:00 EDT 2021 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.104.144106· OSTI ID:2532381

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Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

The high-temperature and high-pressure response of magnesium has been investigated through shock-release experiments performed up to shock melting. The longitudinal and bulk sound speeds of Mg are reported along the Hugoniot from 25 to 56 GPa and used to determine the elastic properties and Grüneisen parameter. The hexagonal close-packed (hcp)–body-centered cubic (bcc) phase transition is marked by a reduction in the determined shear wave speed. Thermal softening is observed to begin between 40 and 44 GPa, with incipient melt at 55.5 GPa, in close agreement with previous diffraction measurements under laser shock loading. Examination of the release profiles showed that two different responses were observed, depending on the peak stress. When plotted in a stress-energy phase diagram, the two responses are observed to form separate lines that intersect the static hcp-bcc phase transition and incipient melt. The results indicate that the hcp-bcc transition occurs on the Hugoniot at 28.4 GPa and place the hcp-bcc-liquid triple point ~20 GPa. In conclusion, a multiphase equation of state is developed which places the melt boundary below the previously reported static measurements.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2532381

Report Number(s):: LA-UR--21-22794

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 14 Vol. 104; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Alkaline earth metals
Body-centered cubic
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Phase diagrams
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Shock melting and the hcp-bcc phase boundary of Mg under dynamic loading

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