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Influence of gaseous environment on reaction behavior and phase formation in Ti/2B reactive multilayer foils

Materials Research Society Symposium Proceedings

Rodriguez, Mark A.; Jones, Eric; Adams, David P.

The effects of surrounding gaseous environment on the reaction behaviors and product formation for sputter-deposited Ti/2B reactive multilayers are reported. With the surrounding environment set to different air pressures, from atmospheric conditions to 10-4 Torr, Ti/2B samples were reacted in a self-propagating mode, and the average reaction wave velocities were determined through high-speed imaging. Propagation speeds for 3.0 μm-thick multilayers were in the range of 10.89 to 0.05 m/s depending on bilayer thickness (i.e., reactant layer periodicity) and ambient pressure. X-ray diffraction analysis showed that single-phase TiB2 forms within multilayers that have small bilayer thickness. Multilayers that have a large bilayer thickness developed a mixture of TiB2, TiB and TiO2. © 2012 Materials Research Society.

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TYPE Conference YEAR 2011
OSTIScopus

Direct observation of spinlike reaction fronts in planar energetic multilayer foils

Applied Physics Letters

McDonald, Joel P.; Hodges, V.C.; Jones, Eric; Adams, David P.

Propagating reactions in initially planar cobalt/aluminum exothermic multilayer foils have been investigated using high-speed digital photography. Real-time observations of reactions indicate that unsteady (spinlike) reaction propagation leads to the formation of highly periodic surface morphologies with length scales ranging from 1 μm to 1 mm. The characteristics of propagating spinlike reactions and corresponding reacted foil morphologies depend on the bilayer thickness of multilayer foils. © 2009 American Institute of Physics.

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TYPE Journal Article YEAR 2009
ScopusOSTI

Unsteady reaction behaviors in reactive Co/Al multilayer foils

Materials Research Society Symposium Proceedings

Mcdonald, Joel P.; Jones, Eric; Hodges, V.C.; Adams, David P.

Reaction dynamics in exothermic Co/Al multilayer foils are studied with high speed digital photography. Unsteady, spin-like reaction propagation is observed in which the net synthesis of a foil is accomplished through advancing transverse bands that propagate perpendicular to the net reaction direction. This unsteady behavior is connected to the final reacted foil surface morphology that exhibits periodic structures. The evolution of the reaction front shape and corresponding surface morphology are discussed with respect to Co/Al foil characteristics. © 2009 Materials Research Society.

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TYPE Conference YEAR 2008
ScopusOSTI
23 Results
23 Results