Shock-induced reaction synthesis (SRS) of nickel aluminides
- Center for Explosives Technology Research (CETR), New Mexico Tech, Socorro, New Mexico 87801 (United States)
- Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
Shock-induced chemical reactions between nickel and aluminum powders (mixed in Ni{sub 3}Al stoichiometry) are used for the synthesis of nickel aluminides. It is shown that the extent of shock-induced chemical reactions and the nature of the shock-synthesized products are influenced by the morphology of the starting powders. Irregular (flaky type) and fine morphologies of the powders undergo complete reactions in contrast to partial reactions occurring in coarse and uniform morphology powders under identical shock loading conditions. Furthermore, irregular morphology powders result in the formation of the equiatomic (B2 phase) NiAl compound while the Ni{sub 3}Al (L1{sub 2} phase) compound is the reaction product with coarse and regular morphology powders. Shock-induced reaction synthesis can be characterized as a bulk reaction process involving an intense mechanochemical'' mechanism. It is a process in which shock compression induces fluid-like plastic flow and mixing, and enhances the reactivity due to the introduction of defects and cleansing of particle surfaces, which strongly influence the synthesis process.
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 7088914
- Journal Information:
- Journal of Materials Research; (United States), Journal Name: Journal of Materials Research; (United States) Vol. 7:5; ISSN JMREE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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