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The effect of size and composition on the strength and hardening of Cu–Ni/Nb nanoscale metallic composites

Published online by Cambridge University Press:  13 June 2017

Ioannis N. Mastorakos ,
Rachel L. Schoeppner ,
Brian Kowalczyk  and
David F. Bahr
Ioannis N. Mastorakos*
Affiliation:
Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, New York 13699, USA
Rachel L. Schoeppner
Affiliation:
Swiss Federal Laboratories for Materials Science and Technology (Empa), Thun CH-3602, Switzerland
Brian Kowalczyk
Affiliation:
Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, New York 13699, USA
David F. Bahr
Affiliation:
Department of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
*
a) Address all correspondence to this author. e-mail: imastora@clarkson.edu
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Abstract

Nanoscale metallic material composites consisting of bilayer and trilayer systems of two and three different metallic alternating layers show significant gains in hardness over monolithic single phase films. One of the main applications of these composites can be as protective coatings to technical components to increase their lifespan acting as a mechanical barrier to the carriers of permanent deformation. In this work, we study the strength of bilayer structures made of alternating layers of niobium (Nb) and copper–nickel (Cu–Ni) alloys. The effect of the layer size and composition on strength and hardening as well as the effect of the metal–alloy interface on the dislocation motion is investigated. The simulations reveal a close relationship between the atomic composition of the alloy and the hardening of the film. The results are also compared with experimental findings on nanopillars made of similar structures, and strong similarities are revealed and discussed.

Keywords

nanostructurealloycomposite
Type
Invited Papers
Information
Journal of Materials Research , Volume 32 , Issue 13 , 14 July 2017 , pp. 2542 - 2550
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Gary L. Messing

References

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