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Effect of Temperature in the Evolution of Ni/Al Nanolayers

Published online by Cambridge University Press:  03 October 2008

A.S. Ramos ,
S. Simões ,
Rosa Calinas  and
F. Viana
A.S. Ramos
Affiliation:
ICEMS, Departamento de Engenharia Mecânica, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, R. Luís Reis Santos, 3030-788 Coimbra, Portugal
S. Simões
Affiliation:
Departamento de Engenharia Metalúrgica e Materiais, GMM/IMAT, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200–465 Porto, Portugal
Rosa Calinas
Affiliation:
ICEMS, Departamento de Engenharia Mecânica, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, R. Luís Reis Santos, 3030-788 Coimbra, Portugal
F. Viana
Affiliation:
Departamento de Engenharia Metalúrgica e Materiais, GMM/IMAT, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200–465 Porto, Portugal

Abstract

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Nickel aluminides can be formed by thermal annealing of alternate layers of Ni and Al that react exothermically. These metals have medium/high energy of mixing and when in adiabatic conditions the reaction could become self-propagating. The first phase to form in Ni/Al reactions has been widely investigated, but there is no consensus regarding this subject. Depending on the overall chemical composition and modulation period of the multilayer, and on the processing history, the first phase to form could be NiAl3, NiAl and Ni2Al9.

Type
Abstract
Information
Microscopy and Microanalysis , Volume 14 , Supplement S3 , September 2008 , pp. 41 - 42
Copyright
Copyright © Microscopy Society of America 2008