Abstract
We here design and fabricate a new kind of copper matrix composites, where titanium carbide nanoparticles are in situ incorporated into and embedded within the copper matrix, by virtue of laser powder-bed-fusion (L-PBF) process. We made a multiscale examination on the microstructures of the additively manufactured samples, unraveling that there are many unusual microstructural features, including grain refinement, the existence of high-density dislocations, and supersaturation of titanium solute atoms in the as-printed metal matrix composites. These unique microstructural features are mainly interpreted by the intense thermal history and the rapid solidification nature of the L-PBF process. The resultant composites then integrate the most important four strengthening mechanisms in metals: grain boundary strengthening, dislocation strengthening, solid solution strengthening, and second-phase strengthening, rendering this new kind of copper matrix composites a remarkably high yield strength (~490 MPa) and large uniform elongation (~12%), surpassing many high-performance copper matrix composites and copper alloys.
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Acknowledgments
We would like to acknowledge the financial support from the National Natural Science Foundation of China (Grant Nos. 51801120 and 51771111) and the Science & Technology Commission of Shanghai Municipality (Grant No. 17520712400). Shenbao Jin from Nanjing University of Science and Technology is thanked for his kind assistance in APT sample preparation and data analysis.
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Ouyang, H., Wang, G., Li, Z. et al. Additively manufactured copper matrix composites: Heterogeneous microstructures and combined strengthening effects. Journal of Materials Research 35, 1913–1921 (2020). https://doi.org/10.1557/jmr.2020.62
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DOI: https://doi.org/10.1557/jmr.2020.62