Surface Specularity as an Indicator of Shock-induced Solid-liquid Phase Transitions in Tin

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Description

When highly polished metal surfaces melt upon release after shock loading, they exhibit features that suggest significant surface changes accompany the phase transition. The reflection of light from such surfaces changes from specular (pre-shock) to diffuse upon melting. Typical of this phenomenon is the loss of signal light in velocity interferometer system for any reflector (VISAR) measurements, which usually occurs at pressures high enough to melt the free surface. Unlike many other potential material phase-sensitive diagnostics (e.g., reflectometry, conductivity), that show relatively small (1%-10%) changes, the specularity of reflection provides a more sensitive and definitive (>10x) indication of the solid-liquid ... continued below

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201-204

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G. D. Stevens, S. S. Lutz, B. R. Marshall, W.D. Turley, et al. December 1, 2007.

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Description

When highly polished metal surfaces melt upon release after shock loading, they exhibit features that suggest significant surface changes accompany the phase transition. The reflection of light from such surfaces changes from specular (pre-shock) to diffuse upon melting. Typical of this phenomenon is the loss of signal light in velocity interferometer system for any reflector (VISAR) measurements, which usually occurs at pressures high enough to melt the free surface. Unlike many other potential material phase-sensitive diagnostics (e.g., reflectometry, conductivity), that show relatively small (1%-10%) changes, the specularity of reflection provides a more sensitive and definitive (>10x) indication of the solid-liquid phase transition. Data will be presented that support the hypothesis that specularity changes indicate melt in a way that can be measured easily and unambiguously.

Physical Description

201-204

Source

  • Journal Name: Shock Compression of Condensed Matter - 2007: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP Conference Proceedings; Journal Volume: 955; Conference: 15th Topical Conference on Shock Compression of Condensed Matter

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  • Report No.: DOE/NV/25946--239
  • Grant Number: DE-AC52-06NA25946
  • Office of Scientific & Technical Information Report Number: 926661
  • Archival Resource Key: ark:/67531/metadc898676

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  • December 1, 2007

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 31, 2016, 8:03 p.m.

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G. D. Stevens, S. S. Lutz, B. R. Marshall, W.D. Turley, et al. Surface Specularity as an Indicator of Shock-induced Solid-liquid Phase Transitions in Tin, article, December 1, 2007; (digital.library.unt.edu/ark:/67531/metadc898676/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.