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High strength and high conductivity in re-processed hypereutectic Cu-Cr alloys
Conference paper   Open access   Peer reviewed

High strength and high conductivity in re-processed hypereutectic Cu-Cr alloys

Ayodele Olofinjana and N Y Voo
Proceedings of the 2017 Materials Science and Technology Conference and Exhibition, Vol.2, pp.800-807
Materials Science and Technology (MS&T) Conference and Exhibition, 2017 (Pittsburgh, United States, 08-Oct-2017–12-Oct-2017)
Curran Associates Inc.
2017
DOI: https://doi.org/10.7449/2017/MST-2017-800-807
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https://doi.org/10.7449/2017/MST-2017-800-807View
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Abstract

copper alloys high strength high conductivity (HSHC) rapid solidification solid solution extension binary alloys chromium alloys hardness high strength alloys solid solutions thermal aging as cast ribbons combined solution combined strengths
Cu-Cr has been proposed to be a good substitute to replace the Cu-Be system for the high strength high conductivity (HSHC) applications. Cu-Cr alloys processing are limited by solidification rates in ingot metallurgy. Here we explore the HSHC properties of high Cr alloys prepared from rapid quenching of alloy melt. It is found that the rapid solidification in the ribbons imposed combined solution extension and ultra-refinement of Cr rich phases. X-ray diffraction studies of the as-cast ribbons suggest that the solid solution extension was up to 6wt%Cr. Thermal aging of the cast ribbons indicated that peak aging treatments occurred in about twenty minutes. Peak hardness ranged from about 200 to well over 300HV. The maximum peak aged hardness of 380HV was obtained for alloy containing 6wt.%Cr but with conductivity of about 50%IACS. The best combined strength/conductivity was obtained for 4wt.%Cr alloy with hardness of 350HV and conductivity of 80% IACS.

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