Effect of Carbon Addition on Solidification Structure and Strength of Cu–Cr <I>In Situ</I> Composite

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  • Effect of Carbon Addition on Solidification Structure and Strength of Cu-Cr In Situ Composite
  • Effect of Carbon Addition on Solidifica
  • Effect of Carbon Addition on Solidification Structure and Strength of Cu&ndash;Cr <I>In Situ</I> Composite

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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 one.<BR>A SIMS analysis 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.

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