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Grain size effects on Ni/Al nanolaminate combustion

Published online by Cambridge University Press:  06 March 2019

Brandon Witbeck  and
Douglas E. Spearot
Brandon Witbeck
Affiliation:
Department of Mechanical & Aerospace Engineering, University of Florida, Gainesville, Florida 32611, USA; and Air Force Research Lab, Munitions Directorate, Eglin AFB, Florida 32542, USA
Douglas E. Spearot*
Affiliation:
Department of Mechanical & Aerospace Engineering, University of Florida, Gainesville, Florida 32611, USA
*
a)Address all correspondence to this author. e-mail: dspearot@ufl.edu
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Abstract

Reactions in Ni/Al nanolaminates exhibit high combustion temperatures and wave speeds that are customizable through changes to nanostructure. Nanolaminates fabricated via vapor deposition exhibit columnar grains with average diameters on the order of the individual layer thickness; yet, their role on nanolaminate combustion has not been previously investigated. The current work uses molecular dynamics simulations to elucidate the effect of grain size on reaction rates and combustion temperatures in Ni/Al nanolaminates. Decreasing grain size is shown to increase reaction rates as well as increase peak temperatures consistent with the excess enthalpy of smaller grain sizes. Additionally, grain boundaries provide heterogenous nucleation sites for the diffusion-restricting B2–NiAl phase. Focusing on Ni diffusion into liquid Al, an effective diffusion coefficient is computed as a function of grain size, which may be used in thermodynamic models for this stage of the reaction.

Keywords

grain boundariesgrain sizereactivity
Type
Invited Paper
Information
Journal of Materials Research , Volume 34 , Issue 13: Focus Issue: Intrinsic and Extrinsic Size Effects in Materials , 15 July 2019 , pp. 2229 - 2238
Copyright
Copyright © Materials Research Society 2019 

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