Mechanistic aspects of shock-induced reactions in Ni+Al powder mixtures
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A combination of parallel-plate impact experiments utilizing stress measurements and mesoscale numerical simulations are used to investigate the effect of particle morphology on the mechanical and chemical response of Ni+Al powder mixtures. The instrumented gas-gun impact experiments were performed at pressures up to 6 GPa. Based on measured shock velocity increases and shock compressibility changes consistent with the Ballotechnic model, the flake-based powder mixture was found to exhibit shock-induced reaction. The particle-level mechanistic details of deformation, mass-flow, and mixing, were explored through discrete particle continuum simulations, validated against the experimental results. The micron-scale spherical and flake mixtures were found to display widely varying configurational changes at several length scales, which give insight into why the flake-Ni morphology is more susceptible to shock-induced reactions under the imposed conditions.
- OSTI ID:
- 21039509
- Journal Information:
- AIP Conference Proceedings, Vol. 955, Issue 1; Conference: Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter, Waikoloa, HI (United States), 24-29 Jun 2007; Other Information: DOI: 10.1063/1.2832890; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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