J. Japan Inst. Metals, Vol. 61, No. 10 (1997),
pp. 1044-1049

Effect of Carbon Addition on Solidification Structure and Strengthin Cu-Cr In-situ Composite

Kuniteru Mihara, Takao Takeuchi and Hirowo G. Suzuki

Abstract:

A small amount of carbon was doped into a Cu-15 mass%Cr in-situ composite to increase the strength of the material. It is found that in the as-cast state Cr dendrites exhibit a needle shape, which can be deformed into fibers much easier than the equiaxial ones.
A SIMS with the aid of thermodynamic simulation analysis suggests that Cr carbide exists as a nucleation site of Cr dendrites.

The composite has a tensile strength of 1200 MPa and an electrical conductivity of 38%IACS in the cold-worked state, and 960 MPa and 73%IACS after optimized aging treatment.

(Received March 17, 1997)

Keywords:

copper, chromium, in situ composite, carbon, super cooling, dendrite, strength, electrical conductivity

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