期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.142392
关键词
In-situ oxidation; Nail board-like structure; Composites; Mechanical properties
类别
资金
- National Natural Science Foundation of China [11872171]
- Fundamental Research Funds for the Central Universities [B200202117]
This study achieved the dispersion of MXenes in copper powders using high-shear mixing, and formed TiO2 particle-based nanostructure reinforcement (NSR) during spark plasma sintering process, significantly improving the yield strength of the copper matrix. Experimental characterization and modeling simulations identified second phase strengthening as the main reason for the improved yield strength of the composites, with the mechanical engagement of NSR playing a crucial role in strengthening.
Two-dimensional (2D) nanomaterials based on MXenes have gained increasing importance in the field of strength reinforcement. However, the easy oxidation of MXenes has long been deemed unfavorable for reinforcement in high-temperature processing. Herein, high-shear mixing was used in present work for simple and efficient dispersion of MXenes in copper powders. Partial MXene sheets were also in-situ oxidized to TiO2 particles to form nail board-like structure reinforcement (NSR) during spark plasma sintering (SPS) process at 600 degrees C, which allowed one to significantly improve the yield strength of copper matrix by up to 70.3%. Experimental characterization and modeling simulations enabled one to identify second phase strengthening as the main reason for increased yield strength of the composites. In particular, the mechanical engagement of NSR played an important role in strengthening. Meanwhile, the hardness of TiO2 particles on NSR was found to be higher than that of the copper matrix, leading to enhancement in compressive yield strength. Also, the presence of MXene sheets on NSR slightly reduced the resistance of copper matrix composites. In sum, these findings look promising for designing novel MXene reinforced metal matrix composites with improved mechanical properties.
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