200-fold increase in dynamic strength of platinum at 430 GPa without a phase transformation

G Righi and YJ Kim and RE Rudd and TE Lockard and MP Hill and JM McNaney and AM Murphy and CV Stan and HS Park, PHYSICAL REVIEW B, 111, 144109 (2025).

DOI: 10.1103/PhysRevB.111.144109

The high-pressure strength of solid platinum is studied at the National Ignition Facility via Rayleigh-Taylor ripple growth under ramp compression. Laser-driven experiments reached pressures up to 430 GPa, collecting velocimetry and radiography data. Despite no phase transformation, the observed ripple growth aligns with hydrodynamic simulations using an amplified Steinberg-Guinan model, resulting in a 200-fold increase in strength. Molecular dynamics simulations of platinum ramp compression yield similar von Mises stress at comparable high pressure and high strain rate conditions. These findings represent the highest-pressure strength measurements ever achieved for platinum and offer critical insight into its significant strengthening behavior under high pressure and strain rate conditions.

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