Postshock spectral radiance measurements in nickel and nickel/aluminum powders
Because of complications associated with temperature heterogeneities in shocked metal powders, time-resolved radiation pyrometer measurements of shock temperatures in powders with particle sizes greater than a few tens of microns cannot be made under normal laboratory conditions with uniaxial loading durations limited to about one microsecond. Fortunately, for highly porous, reactive powders, the difference between shock and postshock temperature is negligible. For loading conditions similar to those that have yielded reaction products in recovery experiments, there is no evidence of any chemical reaction in a coarse ({minus}325 mesh) nickel/aluminum powder mixture within the first 6 {mu}s of shock arrival, based on constraints on postshock temperatures provided by thermal radiation measurements. This result is in contrast to that for a micron-sized nickel/aluminum mixture, for which there is evidence of significant reaction on a time scale of 100 ns under similar shock loading conditions. 12 refs., 6 figs.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOD; USDOE; Department of Defense, Washington, DC (United States); USDOE, Washington, DC (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5759288
- Report Number(s):
- SAND-91-1197C; CONF-9107105-35; ON: DE91014695
- Resource Relation:
- Conference: 1991 American Physical Society (APS) conference on shock compression of condensed matter, Williamsburg, VA (United States), 17-20 Jul 1991
- Country of Publication:
- United States
- Language:
- English
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