Abstract
A series of Alx(CoCrNi)100-x (x = 0–21 at.%) medium-entropy alloys (MEAs) were designed and prepared to investigate the effects of Al addition on the microstructures and tensile properties. The results reveal that the lattice structure changes from the initial single FCC structure (x < 10 at.%), to the FCC and disordered BCC structures (x = 10 and 11 at.%), then to the FCC and BCC/B2 structures (11 < x < 21 at.%), finally to the duplex BCC/B2 structures (x ≥ 21 at.%) with increasing Al addition. Consistent with microstructures, significant changes also occur in the corresponding tensile properties with Al addition, showing that the strength increases and the ductility decreases with increasing Al addition. Especially, the Al-15 MEA exhibits an acceptable balance of strength and ductility. Furthermore, the mechanism of microstructure evolution and the correlation between microstructures and tensile properties were also discussed and clarified.
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Acknowledgements
The authors thank Ming-Lei Liu (Northeastern University, China) for technical assistance with alloy fabrication, and Liang-Xue Zhang (Institute of Metal Research, Chinese Academy of Sciences/University of Science and Technology of China, China) for technical assistance with TEM characterization. This work was supported by the National Natural Science Foundation of China (NSFC, Grant Nos. 52071319 and 51971060), the Foundation for Outstanding Young Scholar sponsored by Institute of Metal Research (IMR), the Foundation for Outstanding Young Scholar sponsored by the Shenyang National Laboratory for Materials Science (L2019F23), and the Fundamental Research Project of Shenyang National Laboratory for Materials Science (No. L2019R18).
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Zou, JP., Luo, XM., Zhang, B. et al. Microstructure Evolution and Tensile Properties of the Alx(CoCrNi)100-x Medium-Entropy Alloys. Acta Metall. Sin. (Engl. Lett.) 36, 2045–2057 (2023). https://doi.org/10.1007/s40195-023-01623-7
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DOI: https://doi.org/10.1007/s40195-023-01623-7