| Autor: |
Vandersall, Kevin S., Thadhani, Naresh N. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 8/1/2003, Vol. 94 Issue 3, p1575, 9p, 1 Black and White Photograph, 1 Diagram, 1 Chart, 5 Graphs |
| Abstrakt: |
The shock-compression response of Mo+ 2Si elemental powder mixtures was investigated using instrumented experiments in the velocity range of 500 m/s to 1 km/s. The experiments employed polyvinyl difluoride stress gauges placed at the front and rear surfaces of the powder mixtures to determine the crush strength, densification history, and shock-induced reaction initiation characteristics. Experiments performed on ∼58% dense Mo+ 2 Si powder mixtures at input stresses less than 4 GPa showed characteristics of powder densification and dispersed propagated wave stress profiles with rise time >∼40 ns. At input stress between 4 and 6 GPa, the powder mixtures showed a shock-compression response following the Hugoniot of the solid-density mixture. In the stress regime of 6-7 GPa, shock-induced melting of silicon was observed, which appears to inhibit a shock-induced chemical reaction on the time scale of the time-resolved measurements. The results of the present work on Mo-Si, taken in conjunction with prior work on the Nb-Si and Ti-Si systems, illustrate that premature melting of silicon and its capillary flow can limit the deformation and mixing between reactants, thereby inhibiting the initiation of "shock-induced" chemical reactions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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