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Effect of Temperature on the Mechanical Properties and Microstructures of In Situ Formed Cu-Nb and Cu-Ta Composites

Published online by Cambridge University Press:  22 February 2011

W. A. Spitzig ,
P. D. Krotz ,
L. S. Chumbley ,
H. L. Downing  and
J. D. Verhoeven
W. A. Spitzig
Affiliation:
Ames Laboratory-USDOE, Iowa State University, Ames, IA 50011
P. D. Krotz
Affiliation:
Ames Laboratory-USDOE, Iowa State University, Ames, IA 50011
L. S. Chumbley
Affiliation:
Ames Laboratory-USDOE, Iowa State University, Ames, IA 50011
H. L. Downing
Affiliation:
Drake University, Des Moines, IA 50311
J. D. Verhoeven
Affiliation:
Ames Laboratory-USDOE, Iowa State University, Ames, IA 50011
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Abstract

The effect of temperature on the mechanical properties and microstructures has been evaluated for heavily cold drawn Cu-20% Nb and Cu-20% Ta composites. The strengths of the composites decrease with increasing temperature, with the decrease becoming most pronounced at temperatures above about 300°C and at larger draw ratios. Cu-20% Ta composites are stronger than Cu-20% Nb composites throughout the temperature range studied (22–600°C) with the improvement increasing with increasing temperature. Resistivity measurements and substructure analyses showed that at temperatures where softening accelerated, resistivity decreased indicating a substructural change which was observed to be coarsening of the Nb and Ta filaments in the composites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 120: Symposium G – High-Temperature/High-Performance Composites , 1988 , 45
Copyright
Copyright © Materials Research Society 1988

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