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Hot explosive compaction of aluminum-nickelide composites

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Abstract

Two series of nickel-coated aluminum (Al−Ni) powder compositions were consolidated to full or near-full density by a hot-explosive-compaction (HEC) technique. Mixtures of 78Al-22Ni at. pct (63Al-37Ni wt pct) or 39Al-61Ni at. pct (23Al-77Ni wt pct) were placed in cylindrical containers, preheated to a range of temperatures from ambient to 1000°C, and once at a uniform temperature, explosively compacted into a 150-mm-long and 15-mm-diameter rod-shaped billet using a cylindrical detonation arrangement. The resultant billets were sectioned and prepared for examination by optical microscopy and scanning electron microscopy (SEM). Energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and microhardness measurements were used to characterize the billet morphology, structure, and chemical composition. Analysis revealed that depending on the preheating temperature, the initial Al−Ni composition transformed into several aluminum nickelide (Al−Ni) intermetallics. The onset and nature of the shock-induced transformation from the precursors into the products are discussed.

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Authors and Affiliations

  1. United States Army Research Laboratory, Aberdeen Proving Ground, 21005-5069, MD

    Laszlo J. Kecskes (Research Physical Scientist) & Steven T. Szewczyk (Researcher)

  2. the Institute of Mining Mechanics, Academy of Sciences of Georgia, 380086, Tbilisi, Republic of Georgia

    Akaki B. Peikrishvili (Associate Director) & Nikoloz M. Chikhradze (Staff Scientist)

Authors
  1. Laszlo J. Kecskes
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  2. Steven T. Szewczyk
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  3. Akaki B. Peikrishvili
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  4. Nikoloz M. Chikhradze
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Kecskes, L.J., Szewczyk, S.T., Peikrishvili, A.B. et al. Hot explosive compaction of aluminum-nickelide composites. Metall Mater Trans A 35, 1125–1131 (2004). https://doi.org/10.1007/s11661-004-1015-6

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  • DOI: https://doi.org/10.1007/s11661-004-1015-6

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