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TEM Characterization of As-Deposited and Annealed Ni/Al Multilayer Thin Film

Published online by Cambridge University Press:  01 October 2010

S. Simões ,
F. Viana ,
A.S. Ramos ,
M.T. Vieira  and
M.F. Vieira
S. Simões*
Affiliation:
CEMUC, Department of Metallurgical and Materials Engineering, University of Porto, R. Dr. Roberto Frias, 4200-465 Porto, Portugal
F. Viana
Affiliation:
CEMUC, Department of Metallurgical and Materials Engineering, University of Porto, R. Dr. Roberto Frias, 4200-465 Porto, Portugal
A.S. Ramos
Affiliation:
CEMUC, Department of Mechanical Engineering, University of Coimbra, R. Luís Reis Santos, 3030-788 Coimbra, Portugal
M.T. Vieira
Affiliation:
CEMUC, Department of Mechanical Engineering, University of Coimbra, R. Luís Reis Santos, 3030-788 Coimbra, Portugal
M.F. Vieira
Affiliation:
CEMUC, Department of Metallurgical and Materials Engineering, University of Porto, R. Dr. Roberto Frias, 4200-465 Porto, Portugal
*
Corresponding author. E-mail: sonia.simoes@fe.up.pt
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Abstract

Reactive multilayer thin films that undergo highly exothermic reactions are attractive choices for applications in ignition, propulsion, and joining systems. Ni/Al reactive multilayer thin films were deposited by dc magnetron sputtering with a period of 14 nm. The microstructure of the as-deposited and heat-treated Ni/Al multilayers was studied by transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM) in plan view and in cross section. The cross-section samples for TEM and STEM were prepared by focused ion beam lift-out technique. TEM analysis indicates that the as-deposited samples were composed of Ni and Al. High-resolution TEM images reveal the presence of NiAl in small localized regions. Microstructural characterization shows that heat treating at 450 and 700°C transforms the Ni/Al multilayered structure into equiaxed NiAl fine grains.

Keywords

nickel aluminidesmetallic multilayerexothermic reactionfocused ion beamlift-out techniquetransmission electron microscopy
Type
Special Section from Portugal Meeting
Information
Microscopy and Microanalysis , Volume 16 , Issue 6 , December 2010 , pp. 662 - 669
Copyright
Copyright © Microscopy Society of America 2010

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