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Interface-driven microstructure development and ultra high strength of bulk nanostructured Cu-Nb multilayers fabricated by severe plastic deformation

Published online by Cambridge University Press:  10 April 2013

Irene J. Beyerlein ,
Nathan A. Mara ,
John S. Carpenter ,
Thomas Nizolek ,
William M. Mook ,
Thomas A. Wynn ,
Rodney J. McCabe ,
Jason R. Mayeur ,
Keonwook Kang  and
Shijian Zheng
...Show all authors
Irene J. Beyerlein*
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Nathan A. Mara
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
John S. Carpenter
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Thomas Nizolek
Affiliation:
Department of Materials, University of California at Santa Barbara, Santa Barbara, California 93106
William M. Mook
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Thomas A. Wynn
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Rodney J. McCabe
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Jason R. Mayeur
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Keonwook Kang
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Shijian Zheng
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Jian Wang
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Tresa M. Pollock
Affiliation:
Department of Materials, University of California at Santa Barbara, Santa Barbara, California 93106
*
a)Address all correspondence to this author. e-mail: Irene@lanl.gov
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Abstract

We examine the development of stable bimetal interfaces in nanolayered composites in severe plastic deformation. Copper-niobium multilayers of varying layer thicknesses from several micrometers to 10 nanometers (nm) were fabricated via accumulative roll bonding (ARB). Investigation of their 5-parameter character and atomic scale structure finds that when layer thicknesses refine well below one micrometer, the interfaces self-organize to a few interface orientation relationships. With atomic scale and crystal plasticity modeling, we identify that the two controlling factors that determine whether an interface is stable under high strain rolling are orientation stability of the bicrystal and interface formation energy. A figure-of-merit is introduced that not only predicts the development of the prevailing interfaces but also explains why other interfaces did not develop. Through a suite of nanomechanical and bulk test results, we show that ARB composites containing these stable interfaces are found to have exceptional hardness (∼4.5 GPa) and strength (∼2 GPa).

Keywords

compositestrengthtexture
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 13: FOCUS ISSUE: Frontiers in Thin-Film Epitaxy and Nanostructured Materials , 14 July 2013 , pp. 1799 - 1812
Copyright
Copyright © Materials Research Society 2013 

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References

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