Abstract
A duplex TiC and γ′-Ni3(Al,Ti) reinforced nickel composite was fabricated through hot-press sintering a 30 vol% Ti2AlC–Ni mixtures followed by thermal treatment method. Detailed microstructural detection was performed by adopting the route of high-resolution transmission electron microscopy. In situ generated submicron TiC particulate and nanosized L12-γ′ were homogeneously distributed in a fcc γ-Ni matrix. The high temperature tensile and compression behaviors of the TiC-γ′/Ni composites were evaluated in the temperature range of 25–800 °C. The results indicated that ultimate tensile and compression properties exhibited the dependence of temperatures. The tensile properties of the composite determined at 600 °C was 945 MPa, decreasing by 28.1% and 23.0% for elongation, compared to those of measured at room temperature (UTS = 1305 MPa, elongation = 5.35%). However, the yield strength exhibited the temperature independent until to 600 °C. The yield strength of the TiC-γ′/Ni composite are comparable with conventional superalloy under 600 °C, proving that TiC and γ′ particles constitute efficient reinforcements for Ni matrix according to thermal expansion dislocations strengthening, load-transfer and coherent strengthening mechanisms. The monotonic temperature dependence of yield strength at 600–800 °C indicates that plastic deformation of TiC-γ′/Ni composite follows the thermally activated mechanism. The TiC-γ′/Ni composite exhibited superior mechanical properties both at room and high temperatures, which can be ascribed to the synergistic strengthening effect in term of dislocation density, Orowan, coherent and atomic ordering strengthening mechanisms. The present work reveals the deformation behaviors of in situ TiC-γ′/Ni composite from room to high temperatures, which is critical to predict the failure and thereby optimize the microstructure to further enhance the high temperature properties of TiC-γ′/Ni composite.
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Acknowledgements
This work was supported by the Fundamental Research Funds for the Central Universities under Grant no. 2018YJS144, National Science Foundation of China (NSFC) under Grant Nos. 51871011, 51572017 and 51301013, by Beijing Government Funds for the Constructive Project of Central Universities under Grant no. 353104535. The financial support by them are greatly appreciated.
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Hu, W., Huang, Z., Yu, Q. et al. Investigation on High Temperature Mechanical Behaviors of TiC-γ′ Reinforced Ni Composite. Met. Mater. Int. 27, 3003–3012 (2021). https://doi.org/10.1007/s12540-020-00615-x
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DOI: https://doi.org/10.1007/s12540-020-00615-x