An as-cast Ti-V-Cr-Al light-weight medium entropy alloy with outstanding tensile properties

Da Li, Yaguang Dong, Zhiqing Zhang, Qiuhong Zhang, Shang Chen, Nannan Jia, Haoran Wang, Benpeng Wang, Ke Jin*, Yunfei Xue, Yankun Dou, Xinfu He, Wen Yang, Lu Wang, Hongnian Cai

*此作品的通讯作者

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47 引用 (Scopus)

摘要

Light-weight (LW) high/medium entropy alloys have gained much attention due to the high specific strength, but they usually suffer from poor ductility, especially in the tensile tests at the as-cast state. In this study, the mechanical properties of a series of Ti-V-Cr-Al medium entropy alloys, with Ti and V maintaining equiatomic ratio, are investigated. An outstanding strength-ductility relationship is achieved in a (TiV)91Cr4.5Al4.5 alloy, with a relatively low density of 5.1 g/cm3, a high specific yield strength of 160 MPa/(g/cm3), and a high tensile fracture elongation over 30%, even at its as-cast state. The tensile deformation is dominantly through the typical nucleation, planar migration, and entanglement of dislocations. Secondary phase formation and chemical inhomogeneity in this alloy are both insignificant. The frustration of dislocation motions are mainly attributed to the solid solution strengthening, which also enhances the work-hardening, delays the occurrence of necking, and benefits the overall ductility. The outstanding specific strength-ductility combination of this LW-alloy at the as-cast state makes it promising for potential engineering applications.

源语言英语
文章编号160199
期刊Journal of Alloys and Compounds
877
DOI
出版状态已出版 - 5 10月 2021

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Li, D., Dong, Y., Zhang, Z., Zhang, Q., Chen, S., Jia, N., Wang, H., Wang, B., Jin, K., Xue, Y., Dou, Y., He, X., Yang, W., Wang, L., & Cai, H. (2021). An as-cast Ti-V-Cr-Al light-weight medium entropy alloy with outstanding tensile properties. Journal of Alloys and Compounds, 877, 文章 160199. https://doi.org/10.1016/j.jallcom.2021.160199