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Thermal modification of brittle CoFeNi2(Ti3Si5)0.16 eutectic high-entropy alloy by annealing treatment

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Abstract

Adopting the idea of thermal modification of conventional Si-containing eutectic alloys, this study performed heating of the brittle CoFeNi2(Ti3Si5)0.16 eutectic high-entropy alloy under various annealing conditions to attempt the fragmentation and spheroidization of eutectic microstructure and improve fracture plasticity. Results reveal that the as-cast alloy exhibited fine eutectic microstructures with lamellar + network morphologies, consisting of face-centered cubic (FCC) and M16Ti6Si7-type silicide. After annealing at 1100°C × 120 h, the lamellar + network eutectic morphologies were effectively fragmented and spheroidized into granular + irregular morphologies. The resulting alloy featured excellent mechanical properties with an ultimate compressive strength (UCS) of 1980 ± 50 MPa, fracture plasticity of ∼16.6% ± 1%, and hardness of ∼448 ±15 HV. Compared with the as-cast specimen, the fracture plasticity of the specimen annealed for 120 h increased by 12.7 times, with no UCS reduction. With a further increase in the annealing time, the hard M16Ti6Si7-type silicide was seriously coarsened, deteriorating the alloy’s room-temperature mechanical properties but improving its high-temperature ones.

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Authors and Affiliations

  1. Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China

    LingKun Zhang, MingLiang Wang, Rui Huang & YiPing Lu

  2. Ningbo Branch of Chinese Academy of Ordnance Science, Ningbo, 315103, China

    XiaoHu Chen & Zheng Ren

  3. Wuhan Second Ship Design and Research Institute, Wuhan, 430205, China

    Tao He

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  1. LingKun Zhang
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  2. MingLiang Wang
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  3. Rui Huang
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  4. XiaoHu Chen
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  5. Zheng Ren
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  6. Tao He
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  7. YiPing Lu
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Correspondence to YiPing Lu.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant No. U20A20278), the National Key Research and Development Program of China (Grant Nos. 2019YFA0209901 and 2018YFA0702901), Liao Ning Revitalization Talents Program (Grant No. XLYC1807047), and the Major Special Project of “Scientific and Technological Innovation 2025” in Ningbo (Grant No. 2019B10086).

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Zhang, L., Wang, M., Huang, R. et al. Thermal modification of brittle CoFeNi2(Ti3Si5)0.16 eutectic high-entropy alloy by annealing treatment. Sci. China Technol. Sci. 66, 966–975 (2023). https://doi.org/10.1007/s11431-022-2300-1

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  • DOI: https://doi.org/10.1007/s11431-022-2300-1

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