Authors:
Francisco Canillas (1), Nerea Ordas (2), Ernesto Urionabarrenetxea (2), Marcelo Roldan (1), Evelin Cardozo (2), Carlos Bloem (3), Edgar Leon-Gutierrez
1- Ciemat, National Fusion Laboratory, Madrid, Spain
2- Ceit-BRTA and Tecnun (Universidad de Navarra), Donostia-San Sebastián, Spain
3- AIDIMME, Paterna, Spain
Abstract:
CuCrZr is a precipitation-hardenable Cu alloy that combines high thermal conductivity and mechanical strength, along with thermal stability up to 350 °C. In this work we demonstrate the feasibility to obtain dense Cu-(0.6-0.9)Cr-(0.07-0.15)Zr (in wt.%) with densities of 99.5%, high thermal conductivity (>80-85% IACS) and enhanced mechanical strength compared to pure Cu, already in the as-built condition, using Powder Bed Fusion Electron Beam (PBF-EB). Further densification was achieved after HIP. Mechanical characterization showed outstanding results, similar or even superior to those reported in the literature for conventional wrought CuCrZr. Microstructural analysis by SEM, EBSD and TEM revealed a multi-scale hierarchical microstructure of ultra-fine Cr-rich precipitates as well as grain and subgrain boundaries, contributing to the excellent mechanical properties achieved. The microstructural stability of the CuCrZr alloy was evaluated by heat treatments in the range of 350 – 550 °C for up to 1080 hours.
DOI:
https://doi.org/10.59499/EP246300683
