Study on Microstructure and Mechanical Properties of Al_0.5TiNbX_0.5 High-Entropy Alloys

Abstract:

In order to explore the influence of V, Mo and Zr elements on Al_0.5TiNb-based refractory high-entropy alloys. Three alloys Al_0.5TiNbV_0.5, Al_0.5TiNbZr_0.5 and Al_0.5TiNbMo_0.5 were used as experimental materials in this paper. The phase structures, microstructures and mechanical properties of the three designed alloys were analyzed by using X-ray diffraction, optical Olympus metallographic microscope and mechanical performance testing. The results show that the three designed alloys are composed of BCC phase solid solution. There was no formation of intermetallic compounds. The yield strength of Al_0.5TiNbZr_0.5 and the compressive plastic strain of Al_0.5TiNbV_0.5 reached the maximum value of 1340 MPa and 7.86%, respectively. This might be attributed to four effects of high-entropy alloys and the strengthening effect of dendrites. The dendrite content of Al_0.5TiNbZr_0.5, Al_0.5TiNbMo_0.5 and Al_0.5TiNbV_0.5 decreases successively. There are coarse grain boundaries in the microstructure of Al_0.5TiNbV_0.5, which contribute to improvement of compressive plasticity.

• Periodical: Materials Science Forum (Volume 1064)
• Pages: 183-188
• DOI: https://doi.org/10.4028/p-i42odn
• Online since: June 2022
• Authors: Peilin Ren, Zhi Sheng Nong*, Zhuang Li, Ji Jie Wang, Li Zhang
• Keywords: Mechanical Properties, Microstructure, Phase Structure, Refractory High-Entropy Alloys

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