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Effect of Solid Solution Treatment on the Microstructure and Properties of AlNb1.5TaTi2Zr1.5 Refractory High-Entropy Alloy

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Abstract

The refractory high-entropy alloy of AlNb1.5TaTi2Zr1.5 was prepared by vacuum arc melting, and the alloy was subjected to solid solution treatment at 1473 K/2 h under an argon environment. The microstructures and mechanical properties of AlNb1.5TaTi2Zr1.5 in both the as-cast and solid solution states were studied. The results showed that the density of the as-cast AlNb1.5TaTi2Zr1.5 alloy is 6.85 g/cm3, and it has a two-phase structure consisting of a BCC matrix and a second phase of HCP. After solid solution treatment, the phase composition of the BCC microstructure was accompanied by the precipitation of a B2-ordered phase. Due to the dual effect of lattice distortion and the obstruction of B2-ordered particles, the hardness of the solid solution state AlNb1.5TaTi2Zr1.5 alloy reached a high value of 7.42 GPa. The compressive stress at room temperature was 2370.05 MPa, and the high-temperature compressive stress in solid solution at 873 K was 1061.68 MPa. The compressive properties at room and high temperatures were greatly improved, and their properties were higher than those of the as-cast state.

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Acknowledgment

This work was supported by the Talent Training Project of the Central Government’s Reform and Development Funds for Local Universities (Grant Number [2021]137).

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  1. School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin, 150040, China

    Kaidi Liu & Yandong Yu

  2. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China

    Hao Zhou

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Liu, K., Yu, Y. & Zhou, H. Effect of Solid Solution Treatment on the Microstructure and Properties of AlNb1.5TaTi2Zr1.5 Refractory High-Entropy Alloy. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09554-9

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