This review examines the development and current state of Cu-rich Cu-Cr-Nb alloys commonly referred to as GRCop or Glenn Research copper alloys with emphasis on Cu-8Cr-4Nb (at%), or GRCop-84, and Cu-4Cr-2Nb, or GRCop-42. Recent additive manufacturing efforts have increased interest in GRCop alloys, and full-scale hardware has been fabricated using AM techniques and practical hot-fire tests have been conducted, but structure-property relationships are still under development. The development, processing, and current microstructure-property relationships of GRCop alloys are reviewed along with comparisons to similar high-heat-flux Cu alloys including NARloy-Z, GlidCop Al-15, AMZIRC, Cu-1Cr-0.1Zr, and Cu-0.9Cr. The review concludes with an assessment of future prospects for GRCop alloys and overview of advantages provided by additive manufacturing.
ORNL worked with The DOW Chemical Company to validate the feasibility of 3D printing DOW's polyurethane (PU) materials using ORNL's equipment and know-how. This led to the development of the first directly-3D-printable PU material.
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