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Size Effect in the Plasticity of Multiscale NanofilamentaryCu/Nb Composite Wires During in-situ Tensile Tests Under NeutronBeam

Published online by Cambridge University Press:  26 February 2011

Vanessa Vidal ,
Ludovic Thilly ,
Steven Van Petegem ,
Uwe Stuhr ,
Florence Lecouturier ,
Pierre-Olivier Renault  and
Helena Van Swygenhoven
Vanessa Vidal
Affiliation:
vvidal@lncmp.org, CNRS, LNCMP, 143 avenue de Rangueil, TOULOUSE, 31400, France
Ludovic Thilly
Affiliation:
ludovic.thilly@univ-poitiers.fr, CNRS-University of Poitiers, Laboratoire de Métallurgie Physique, SP2MI, Boulevard M. et P. Curie, Teleport 2, BP 30179, Futuroscope Chasseneuil, 86962, France
Steven Van Petegem
Affiliation:
steven.vanpetegem@psi.ch, Paul Scherrer Institut, Villigen-PSI, CH-5232, Switzerland
Uwe Stuhr
Affiliation:
uwe.stuhr@psi.ch, Paul Scherrer Institut, Villigen-PSI, CH-5232, Switzerland
Florence Lecouturier
Affiliation:
lecouturier@lncmp.org, CNRS-UPS-INSA, Laboratoire National des Champs Magnétiques Pulsés, 143 avenue de Rangueil, Toulouse, 31400, France
Pierre-Olivier Renault
Affiliation:
pierre.olivier.renault@univ-poitiers.fr, CNRS-University of Poitiers, Laboratoire de Métallurgie Physique, SP2MI, Boulevard M. et P. Curie, Teleport 2, BP 30179, Futuroscope Chasseneuil, 86962, France
Helena Van Swygenhoven
Affiliation:
helena.vanswygenhoven@psi.ch, Paul Scherrer Institut, Villigen-PSI, CH-5232, Switzerland
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Abstract

Copper-based high strength nanofilamentary wires reinforced by bccnanofilaments (Nb or Ta) are prepared by severe plastic deformation for thewinding of high pulsed magnets. In-situ tensile tests under neutron beamwere performed on a Cu/Nb nanocomposite composed of a multiscale Cu matrixembedding 554 Nb filaments with a diameter of 267 nm and spacingof 45 nm. The evolution of elastic strains for individual lattice plane ineach phase and peak profiles in the copper matrix versus applied stressevidenced the co-deformation behavior with different elastic-plastic regimesand load sharing: the Cu matrix exhibits size effect in the finest channelswhile the Nb nanowhiskers remain elastic up to the macroscopic failure, witha strong load transfer from the copper matrix onto zones that are still inthe elastic regime. Taking into account results from residual latticestrains also determined by neutron diffraction, the yield stress in thefinest Cu channels is in agreement with calculations based on a singledislocation regime.

Keywords

nanostructureneutron scatteringstress/strain relationship

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References

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