Session L3: ID-6: Nanocrystalline Metals, DU and BCC Metals
3:30 PM–5:30 PM, Tuesday, June 30, 2009
Room: Hermitage C
Chair: Sergey Razorenov, Institute of Problems of Chemical Physics, Russian Academy of Sciences
Abstract ID: BAPS.2009.SHOCK.L3.1
Abstract: L3.00001 : Response of Pt-based Bulk Metallic Glass to Shock Wave Compression
3:30 PM–3:45 PM
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Authors:
B.M. LaLone
(Institute for Shock Physics and Department of Physics, WSU)
Y.M. Gupta
(Institute for Shock Physics and Department of Physics, WSU)
Plate impact experiments were performed on platinum based bulk metallic glass (BMG) samples having a nominal composition of Pt$_{57.5}$Cu$_{14.7}$Ni$_{5.3}$P$_{22.5}$, a material previously reported to support large plastic strains under quasi-static, uniaxial stress loading (J. Schroers, and W. L. Johnson, Phys. Rev. Lett. \textbf{93,} 255506 (2004)). In the present shock wave experiments, peak longitudinal stresses ranged from 9-30 GPa. Piezoelectric pins and a velocity interferometer were used to measure shock velocities and particle velocity histories. A clear two-wave structure was observed in the particle velocity histories indicating an elastic-plastic response. The elastic wave amplitude was dependent on peak stress and sample thickness, with values ranging from 8.6 - 14.2 GPa. Measured wave profiles were converted to stress-density compression, and a nonlinear elastic model was fit to the measured elastic response. Unlike the quasi-static, uniaxial stress data on the same alloy, the shock wave, uniaxial strain results show a loss of strength above the elastic limit. Reasons for this strength loss are discussed. Work supported by the DOE.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.SHOCK.L3.1