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Exothermic reactions in cold-rolled Ni/Al reactive multilayer foils

Published online by Cambridge University Press:  31 January 2011

X. Qiu ,
J. Graeter ,
L. Kecskes  and
J. Wang
X. Qiu
Affiliation:
Department of Mechanical Engineering, Louisiana State University, Baton Rouge, Louisiana 70803
J. Graeter
Affiliation:
Department of Mechanical Engineering, Louisiana State University, Baton Rouge, Louisiana 70803
L. Kecskes
Affiliation:
United States Army Research Laboratory, Aberdeen Proving Ground, Maryland 21005
J. Wang*
Affiliation:
Department of Physics and Tsinghua–Foxcoon Nanotechnology Research Center, Tsinghua University, Beijing 100084, China; and Department of Mechanical Engineering, Louisiana State University, Baton Rouge, Louisiana 70803
*
a) Address all correspondence to this author. e-mail: jpwang@tsinghua.edu.cn
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Abstract

Exothermic reactions in cold-rolled Ni/Al reactive multilayer foils were investigated in this study. A two-stage reaction process was observed in the self-propagating reactions in the cold-rolled foils that were ignited by a point-source flame. Foils taken out of the flame after completing the first stage of the reaction process were compared to those allowed to complete both stages. Differences in the phase-evolution sequence from the two types of foils were studied by differential scanning calorimetry (DSC), using slow and controlled heating of the samples. Several exothermic peaks could be identified from the DSC thermograms for both types of foils. Using the DSC, both the as-cold-rolled and partially reacted foils were heated to each peak temperature to identify the reaction product associated with each peak. X-ray diffraction and scanning electron microscopy analyses showed that the first two peaks corresponded to the formation of Al3Ni, while the third peak corresponded to the formation of AlNi.

Keywords

Chemical reactionAlNi
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 2 , February 2008 , pp. 367 - 375
Copyright
Copyright © Materials Research Society 2007

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