Effect of hot working process on microstructure and properties of Nb37Ti20Al15Zr15Hf5Ta5Mo2W1 refractory high-entropy alloy

doi:10.13251/j.issn.0254-6051.2023.09.007

Abstract

Abstract: Nb₃₇Ti₂₀Al₁₅Zr₁₅Hf₅Ta₅Mo₂W₁(at%) refractory high-entropy alloy was produced by vacuum arc melting. Then the alloy was hot deformed+homogenized, and aged at 750 ℃ for 30-120 h. The as-cast structure, precipitation behavior and mechanical properties of the refractory high-entropy alloy after aging were studied by means of X-ray diffraction, scanning electron microscope, transmission electron microscope and universal mechanical testing machine. The results show that the structure of the as-cast alloy is composed of B2 matrix and antiphase boundaries. After aging, a large amount of vermicular Zr₅Al₃ phase are precipitated within the grain, and rod-shaped Zr₅Al₃ phase are precipitated at the grain boundaries, inducing intergranular fracture. After aging for 30 h, the compressive yield strength of the alloy is 1093.8±7.5 MPa. Due to the interaction between intergranular cracking and Zr₅Al₃ phase after aging, the compressive plasticity is anomaly only 5.8%. After aging for 60, 90, and 120 h, the compressive yield strength of the alloy is about 1300 MPa, and the plasticity is about 15%. It has excellent stability and the fracture is mainly intergranular fracture.

Key words: refractory high-entropy alloy, B2 phase, microstructure evolution, aging, compressive property

CLC Number:

TG132.3⁺2

Shao Xu, Pang Jingyu, Ji Yu, Tang Guangquan, Liu Wenqiang, Cheng Lufan, Li Wen. Effect of hot working process on microstructure and properties of Nb₃₇Ti₂₀Al₁₅Zr₁₅Hf₅Ta₅Mo₂W₁ refractory high-entropy alloy[J]. Heat Treatment of Metals, 2023, 48(9): 42-47.

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Effect of hot working process on microstructure and properties of Nb₃₇Ti₂₀Al₁₅Zr₁₅Hf₅Ta₅Mo₂W₁ refractory high-entropy alloy

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