Multi-megabar Dynamic Strength Measurements of Ta, Au, Pt, and Ir

• DOI: 10.1007/s40870-020-00256-6
• Publication Date: 2020-08-28T08:03:34Z
• Authors: J. L. Brown; J.-P. Davis; C. T. Seagle
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract Magnetic loading was used to shocklessly compress four different metals extreme pressures. Velocimetry monitored the behavior of material as it loaded a desired peak state and then decompressed back down lower Two distinct analysis methods, including wave profile novel Bayesian calibration approach, were employed estimate quantitative strength metrics associated with reversal. Specifically, we report for first time on estimates tantalum, gold, platinum, iridium under shockless compression at strain rates $$\sim 5 \times 10^5$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>∼</mml:mo> <mml:mn>5</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> </mml:msup> </mml:mrow> </mml:math> /s in pressure range $$ 100–400 GPa. The magnitude shear stresses supported by these conditions are surprisingly similar, representing dramatic departure from ambient conditions.