| Autor: |
Stevens, G. D., Lutz, S. S., Marshall, B. R., Turley, W. D., Veeser, L. R., Hixson, R. S., Jensen, B. J., Rigg, P. A., Wilke, M. D. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 12/12/2007, Vol. 955 Issue 1, p201-204, 4p, 1 Black and White Photograph, 1 Diagram, 2 Graphs |
| Abstrakt: |
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. A familiar manifestation of this phenomenon is the loss of signal light in VISAR measurements, which usually occurs at pressures high enough to melt the free surface. Unlike many other potential material phase-sensitive diagnostics (e.g., reflectometery, 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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