Microstructure and mechanical properties of TiNbV0.5Ta0.5Crx (x=0, 0.1, 0.2, 0.5) refractory high-entropy alloys

doi:10.1016/j.jmst.2024.05.056

Abstract

Abstract: The TiNbV_0.5Ta_0.5Cr_x (x = 0, 0.1, 0.2, 0.5) refractory high-entropy alloys (RHEAs) with an excellent combination of ductility and strength were designed and prepared for high-temperature applications. The yield strength, ultimate tensile strength, and elongation of the TiNbV_0.5Ta_0.5Cr_0.1 alloy were 878 MPa, 928 MPa, and 21.6 %, respectively. Important issues of microstructure evolution, precipitation process, and their impact on mechanical properties were concerned. Then, the effect of Cr content on the mechanical properties of TiNbV_0.5Ta_0.5Cr_x alloys was evaluated through a quantitative analysis of the strengthening mechanism, which elucidated the trade-off relationship between solid solution strengthening and precipitation strengthening in RHEA. The microstructure evolution of the TiNbV_0.5Ta_0.5Cr_x alloys involved the formation and interconversion of titanium allotropes (α-Ti and β-Ti) and the precipitation of the Laves phase. Significant embrittlement was induced by the preferential precipitation of α-Ti on the grain boundary. The TiNbV_0.5Ta_0.5Cr_x alloys exhibited an incubation period for Laves phase precipitation, which was related to the Cr content in the alloy. The Laves phase preferentially nucleated next to α-Ti due to the redistribution of elements during the α-Ti precipitation process. The precipitation of the Laves phase played an important role in enhancing the strength of the TiNbV_0.5Ta_0.5Cr_x alloys.

Key words: Refractory high-entropy alloy, Microstructure evolution, Mechanical properties, Strengthening mechanism

Yuxiang Chen, Mingyang Li, Ningyu Li, Yijie Wang, Kang Liu, Yongqin Chang. Microstructure and mechanical properties of TiNbV_0.5Ta_0.5Cr_x (x=0, 0.1, 0.2, 0.5) refractory high-entropy alloys[J]. J. Mater. Sci. Technol., 2025, 211: 254-266.

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Microstructure and mechanical properties of TiNbV_0.5Ta_0.5Cr_x (x=0, 0.1, 0.2, 0.5) refractory high-entropy alloys

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