Abstract
Copper is under consideration as the optimum material for both high heat flux applications and high-frequency pulsed magnets. One challenge is that copper has low strength which is problematic to deployment in these applications. One solution is to alloy copper with body center cubic (BCC) elements to improve its mechanical properties. However, the limited solubility of the BCC elements in copper requires high deformation processes to be used in order to manufacture these 3D composites. In this work high-energy ball milling combined with high-pressure torsion was used to manufacture 3D Cu-Nb composites. After the consolidation, the mechanical properties of the composites were measured using micro-and nano-hardness testing at room and elevated temperatures. The results indicated that after 10 turns during the high-pressure torsion consolidation, the mechanical properties of the composites were completely saturated, displaying uniform properties across the manufactured disk. Performing the high-pressure torsion at elevated temperature further improved the consolidation of the disk. The high-temperature nanoindentation also indicated a change in the deformation mechanism between 200°C and 500°C.
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Acknowledgements
The authors would like to acknowledge the Erich Schmid Institute of Materials Science for use of their HPT set-up and Silke Kaufmann for assistance in sample preparation of the HPT disks. The authors would like to thank the National Academy Keck Futures Initiative for grant PN 6019 for funding. The authors also acknowledge funding from NSF DMR Award no. 1807822. This work was performed at the biomolecular nanotechnology Center, a core facility of the California Institute for Quantitative Biosciences. The work was supported through the INL Laboratory Directed Research & Development (LDRD) Program under DOE Idaho Operations Office Contract DE-AC07-05ID14517.
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Frazer, D., Connick, R.C., Howard, C. et al. Mechanical Property Evaluation of CuNb Composites Manufactured with High-Pressure Torsion. JOM 74, 4026–4034 (2022). https://doi.org/10.1007/s11837-022-05376-z
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DOI: https://doi.org/10.1007/s11837-022-05376-z