Shock synthesis of nickel-aluminides
- Dept. of AMES, University of California, San Diego, La Jolla, California 92093 (United States)
- Sandia National Laboratory, Albuquerque, New Mexico 87185 (United States)
Chemical reactions between nickel and aluminum powder mixtures have been initiated by explosively generated high-pressure shock waves in an attempt to form Ni-Al compounds at temperatures lower than those necessary for conventional alloying. Nickel in the form of powders of coarse''[similar to]50 [mu]m, fine''[similar to]5 [mu]m and flaky''[similar to]40 [mu]m were each reacted with [similar to]15 [mu]m aluminum powder at shock pressures of 7.5 and 16 GPa, in the ratio of 3Ni+1Al. Evidence of reactions leading to the formation of Ni-Al alloy phases was observed in a specimen after processing at the higher shock energy, but only in the case of flaky'' nickel. Scanning electron microscopy (SEM) of this specimen revealed regions consisting of unreacted Ni and Al particles together with isolated regions of a Ni-Al dendritic structure in the prior-Al areas. Quantitative energy-dispersive X-ray spectroscopy (EDX) of the reaction phase showed this to be Al[sub 3]Ni, while the dendritic morphology of the structure indicated that the reaction had proceeded in the liquid state. [copyright] 1994 American Institute of Physics
- OSTI ID:
- 6988081
- Report Number(s):
- CONF-921145--
- Journal Information:
- AIP Conference Proceedings (American Institute of Physics); (United States), Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Vol. 309:1; ISSN 0094-243X; ISSN APCPCS
- Country of Publication:
- United States
- Language:
- English
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