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Mechanistic studies in combustion synthesis of Ni3Al and Ni3Al-matrix composites

Published online by Cambridge University Press:  03 March 2011

Jean-Pascal Lebrat ,
Arvind Varma  and
Paul J. McGinn
Jean-Pascal Lebrat
Affiliation:
Department of Chemical Engineering, University of Notre Dame, Notre Dame, Indiana 46556
Arvind Varma*
Affiliation:
Department of Chemical Engineering, University of Notre Dame, Notre Dame, Indiana 46556
Paul J. McGinn
Affiliation:
Center for Materials Science and Engineering, Department of Electrical Engineering, University of Notre Dame, Notre Dame, Indiana 46556
*
a)All correspondence should be addressed to this author.
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Abstract

Nickel aluminides exhibit limited ductility and toughness at room temperature. One way to improve these characteristics is by adding ceramic reinforcements to the matrix. In this paper, we have studied the combustion synthesis of Ni3Al and Ni3Al-matrix composites, using the self-propagating high-temperature synthesis (SHS) mode. First, studies of the Ni3Al synthesis were carried out by quenching the reaction during its progress, which revealed the mechanism of the synthesis. The influence of Al2O3 and SiC whiskers or particulates, and B4C particulates added to the reaction mixture prior to combustion synthesis, was investigated next. It was found that, in general, reinforcements are heat sinks and limit the propagation of the reaction. Also, whiskers impede the flow of formed liquid to a larger extent than do particulates. Al2O3 is inert and matrices reinforced with up to 2 wt. % Al2O3 are composed essentially of Ni3Al grains. However, both B4C and SiC react with the Ni-Al matrix and lead to complex phases. In particular, B4C readily forms a Ni-Al-B liquid phase and disrupts dramatically the progress of the Ni3Al matrix synthesis.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 5 , May 1994 , pp. 1184 - 1192
Copyright
Copyright © Materials Research Society 1994

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References

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