Volume 39 Issue 5
Oct.  2024
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HE Yixuan, LIU Haoxiang, LI Mingyang, LIU Xudong, LI Jinshan. Effect of Ti Content on Microstructure and Mechanical Properties of the Co39.2Ni39.2Al21.6-xTixDual-phase High Entropy Alloys[J]. Development and Application of Materials, 2024, 39(5): 55-62.
Citation: HE Yixuan, LIU Haoxiang, LI Mingyang, LIU Xudong, LI Jinshan. Effect of Ti Content on Microstructure and Mechanical Properties of the Co39.2Ni39.2Al21.6-xTixDual-phase High Entropy Alloys[J]. Development and Application of Materials, 2024, 39(5): 55-62.
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Effect of Ti Content on Microstructure and Mechanical Properties of the Co39.2Ni39.2Al21.6-xTixDual-phase High Entropy Alloys

  • 1. Collaborative Innovation Center of NPU, Northwestern Polytechnical University, Shanghai 201108, China;

  • 2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;

  • 3. Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an 710072, China

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  • Received Date: March 25, 2024
  • Available Online: November 19, 2024
    Graphical Abstract
    • Abstract
  • Three dual phase high entropy alloys with a composition of Co39.2Ni39.2Al21.6-xTix(x=2, 4, and 6) are prepared in this work. All the three alloys display an FCC-B2 dual phase structure. Dispersed nanoscale L12 ordered precipitate phases are presented in FCC, and lath-like L10 martensite presented in B2 phase. With the increase of Ti content, the volume fractions of FCC and L12 phases and size of L12 phase increase, and the volume fraction of B2 phase decreases. The Co39.2Ni39.2Al15.6Ti6 alloy shows the most excellent combination of strength and ductility. The high strength and plasticity come from the stress induced martensitic transformation in the B2 phase during the deformation process, and the high work hardening rate provided by the L12 ordered precipitate phase in the FCC phase. This work provides a theoretical reference for designing the microstructure of the dual phase high entropy alloys through alloying to enhance their comprehensive mechanical properties.
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    • References (18)
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