Abstract
Hot rolling is an emerging post-processing method for improving mechanical properties of cold sprayed materials. However, the effects of hot rolling on cold sprayed materials are not well clarified. Accordingly, hot rolling assisted with heat treatment was conducted to investigate the effects of hot rolling on plastic deformation of cold sprayed copper bulks. The porosity, crystal grains and dislocation density of copper bulks were characterized through scanning electron microscope, electron back-scatter diffraction and transmission electron microscope. The evolution of pores during hot rolling was simulated using finite element analysis. The microhardness, tensile strength and breaking elongation of the bulks were measured to further explore the effects of hot rolling. The results show that the apparent porosity of the copper bulks sharply decreased due to the dynamic generation and healing processes of the pores in hot rolling. The tensile strength of the copper bulks increased significantly due to the evolution of bonding mechanisms and grain sizes of the copper bulks in hot rolling.
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Acknowledgment
This work was supported by National Natural Science Foundation of China (52171072) and Science and Technology Innovation 2025 Major Project of Ningbo (2020Z042).
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Ye, X., Yu, M., Huang, Q. et al. Evolution of Microstructures and Mechanical Properties of Cold Sprayed Copper in Hot Rolling. J Therm Spray Tech 32, 2701–2712 (2023). https://doi.org/10.1007/s11666-023-01655-6
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DOI: https://doi.org/10.1007/s11666-023-01655-6