Title

Mechanical properties and fracture mechanism of as-cast MnFeCoCuNix high-entropy alloys

Document Type

Journal Article

Publication Title

Transactions of Nonferrous Metals Society of China

Volume

31

Issue

1

First Page

222

Last Page

231

Publisher

Elsevier

School

School of Engineering

Funders

Jiangsu Provincial Science and Technology Plan Project, China National Natural Science Foundation of China 2020 Extracurricular Academic Research Fund for College Students of Nanjing University of Science and Technology, China Australian Research Council Discovery Projects

Comments

Zhu, C. Y., Wu, H., Zhu, H. G., Li, X. D., Tu, C. L., & Xie, Z. H. (2021). Mechanical properties and fracture mechanism of as-cast MnFeCoCuNix high-entropy alloys. Transactions of Nonferrous Metals Society of China, 31(1), 222-231. https://doi.org/10.1016/S1003-6326(20)65489-9

Abstract

© 2021 The Nonferrous Metals Society of China MnFeCoCuNix high-entropy alloys (HEAs) with different Ni contents were fabricated by vacuum induction melting. XRD and SEM−EDS were used to analyze the phase constitution and structure, and the tensile properties of the samples were determined using a universal tensile tester. The results show that the HEAs consist of a dual-phase structure, in which FCC1 phase is rich in Fe and Co, while the FCC2 phase has high contents of Cu and Mn. As Ni content increases, the segregation of Cu decreases, accompanied by the decrease of FCC2 phase. Moreover, the tensile strength of the HEAs increases first and then decreases, and the elongation increases slightly. This is attributed to the combined effect of interface strengthening and solid solution strengthening. The in-situ stretched MnFeCoCuNi0.5 alloy shows obvious neck shrinkage during the tensile fracture process. In the initial deformation stage, the slip lines show different morphologies in the dual-phase structure. However, in the later stage, the surface slip lines become longer and denser due to the redistribution of atoms and the re-separation of the dissolved phase.

DOI

10.1016/S1003-6326(20)65489-9

Access Rights

free_to_read

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