Abstract
Eight-element Nb–Si alloys (Nb–Si–Ti–Cr–Al–Hf–Zr–Ni) with different Ni contents were prepared by arc melting to obtain Nb–Si alloys with high mechanical properties. Phase selection, microstructure evolution, room-temperature fracture toughness, and compressive properties were investigated systematically. Results showed that the eutectic Nb–Si alloy becomes a hypereutectic Nb–Si alloy with the increase in Ni content. All alloys contain Nbss, γ-(Nb, X)5Si3 and Cr2(Nb, X) phases, and 2Ni and 3Ni alloys also contain the primary α-(Nb, X)5Si3 phase. With the increase in Ni content, the content and size of the primary α-(Nb, X)5Si3 phase increased. KQ first increased and then decreased, with the highest KQ of 12.6 MPa m1/2 occurring in the 2Ni alloy. The room-temperature maximum compressive strength was improved with 1 at. pct Ni addition but decreased with higher Ni addition. The strengthening mechanism is solid solution strengthening and a high content of the γ-(Nb, X)5Si3 phase by Ni element addition.
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The authors gratefully acknowledge support from the National Natural Science Foundation of China (51825401) and Young Scientist Studio of Harbin Institute of Technology.
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On behalf of all authors, the corresponding author states that there is no conflict of interest or personal relationships that could have appeared to influence the work reported in this paper. The authors declare the following financial interests/personal relationships which may be considered as potential competing interests.
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Chen, D., Wang, Q., Chen, R. et al. Effect of Ni on Microstructures and Mechanical Properties for Multielemental Nb–Si-Based Alloys. Metall Mater Trans A 53, 1793–1805 (2022). https://doi.org/10.1007/s11661-022-06634-0
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DOI: https://doi.org/10.1007/s11661-022-06634-0