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Plasticity in the nanoscale Cu/Nb single-crystal multilayers as revealed by synchrotron Laue x-ray microdiffraction

Published online by Cambridge University Press:  04 January 2012

Arief Suriadi Budiman ,
Seung-Min Han ,
Nan Li ,
Qiang-Min Wei ,
Patricia Dickerson ,
Nobumichi Tamura ,
Martin Kunz  and
Amit Misra
Arief Suriadi Budiman*
Affiliation:
Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Seung-Min Han
Affiliation:
Department of Materials Science & Engineering, Stanford University, Stanford, California 94305; and Graduate School of Energy, Environment and Water Sustainability, Korea Advanced Institute of Science & Technology, Daejeon 305-701, Republic of Korea
Nan Li
Affiliation:
Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Qiang-Min Wei
Affiliation:
Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Patricia Dickerson
Affiliation:
Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Nobumichi Tamura
Affiliation:
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720
Martin Kunz
Affiliation:
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720
Amit Misra
Affiliation:
Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
*
a)Address all correspondence to this author. e-mail: suriadi@alumni.stanford.edu
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Abstract

There is much interest in the recent years in the nanoscale metallic multilayered composite materials due to their unusual mechanical properties, such as very high flow strength and stable plastic flow to large strains. These unique mechanical properties have been proposed to result from the interface-dominated plasticity mechanisms in nanoscale composite materials. Studying how the dislocation configurations and densities evolve during deformation will be crucial in understanding the yield, work hardening, and recovery mechanisms in the nanolayered materials. In an effort to shed light on these topics, uniaxial compression experiments on nanoscale Cu/Nb single-crystal multilayer pillars using ex situ synchrotron-based Laue x-ray microdiffraction technique were conducted. Using this approach, we studied the nanoscale Cu/Nb multilayer pillars before and after uniaxial compression to about 14% of plastic strain and found significant Laue peak broadening in the Cu phase, which indicates storage of statistically stored dislocations, while no significant Laue peak broadening was observed in the Nb phase in the nanoscale multilayers. These observations suggest that at 14% plastic strain of the nanolayered pillars, the deformation was dominated by plasticity in the Cu nanolayers and elasticity or possibly a zero net plasticity (due to the possibility of annihilation of interface dislocations) in the Nb nanolayers.

Keywords

X-ray diffractionCompositeNanoscale
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 3: Focus Issue: Advances in Mechanics of One-Dimensional Micro/Nanomaterials , 14 February 2012 , pp. 599 - 611
Copyright
Copyright © Materials Research Society 2011

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