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Mechanical Properties Of Cu-Based Composites with in Situ Formed Ultrafine Filaments

Published online by Cambridge University Press:  15 February 2011

J. Bevk ,
W. A. Sunder ,
G. Dublon  and
David E. Cohen
J. Bevk
Affiliation:
Bell LaboratoriesMurray Hill, New Jersey 07974USA
W. A. Sunder
Affiliation:
Bell LaboratoriesMurray Hill, New Jersey 07974USA
G. Dublon
Affiliation:
Division of Applied SciencesHarvard University Cambridge, Massachusetts 02138USA
David E. Cohen
Affiliation:
Division of Applied SciencesHarvard University Cambridge, Massachusetts 02138USA
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Abstract

Elastic and plastic properties of in situ Cu-based composites with Nb, V, and Fe filaments are reviewed. The evidence is presented for a pronounced size dependence of both the ultimate tensile strength and the Young's moduli. In composites with the smallest filaments (d∼50–200Å) and filament densities as high as 1010/cm2 dislocation density reaches values of 1013 cm/cm3. The yield stress of these samples increases dramatically over the predictions based on the “rule of mixtures” and their ultimate tensile strength approaches the estimated theoretical strength of the material (∼2.7GPa). The observed decrease of Young's modulus as a function of inverse wire diameter in the as-drawn composites is attributed to lattice softening due to high density of extended lattice defects. Upon annealing, Young's modulus increases by as much as 100% and exceeds the maximum values calculated from bulk elastic constants. Possible mechanisms leading to modulus enhancement and to related changes in magnetic and superconducting behavior of in situ composites are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 12: Symposium L – In Situ Composites IV , 1981 , 121
Copyright
Copyright © Materials Research Society 1982

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References

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