Dual heterogeneous structures lead to ultrahigh strength and uniform ductility in a Co-Cr-Ni medium-entropy alloy

X. H. Du, W. P. Li, H. T. Chang, T. Yang, G. S. Duan, B. L. Wu, J. C. Huang (), F. R. Chen, C. T. Liu, W. S. Chuang, Y. Lu, M. L. Sui and E. W. Huang
Additional contact information
X. H. Du: Hong Kong Institute for Advanced Study, City University of Hong Kong
W. P. Li: Hong Kong Institute for Advanced Study, City University of Hong Kong
H. T. Chang: Shenyang Aerospace University
T. Yang: Hong Kong Institute for Advanced Study, City University of Hong Kong
G. S. Duan: Shenyang Aerospace University
B. L. Wu: Shenyang Aerospace University
J. C. Huang: Hong Kong Institute for Advanced Study, City University of Hong Kong
F. R. Chen: Hong Kong Institute for Advanced Study, City University of Hong Kong
C. T. Liu: Hong Kong Institute for Advanced Study, City University of Hong Kong
W. S. Chuang: National Sun Yat-Sen University
Y. Lu: Beijing University of Technology
M. L. Sui: Beijing University of Technology
E. W. Huang: National Chiao Tung University

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Alloys with ultra-high strength and sufficient ductility are highly desired for modern engineering applications but difficult to develop. Here we report that, by a careful controlling alloy composition, thermomechanical process, and microstructural feature, a Co-Cr-Ni-based medium-entropy alloy (MEA) with a dual heterogeneous structure of both matrix and precipitates can be designed to provide an ultra-high tensile strength of 2.2 GPa and uniform elongation of 13% at ambient temperature, properties that are much improved over their counterparts without the heterogeneous structure. Electron microscopy characterizations reveal that the dual heterogeneous structures are composed of a heterogeneous matrix with both coarse grains (10∼30 μm) and ultra-fine grains (0.5∼2 μm), together with heterogeneous L12-structured nanoprecipitates ranging from several to hundreds of nanometers. The heterogeneous L12 nanoprecipitates are fully coherent with the matrix, minimizing the elastic misfit strain of interfaces, relieving the stress concentration during deformation, and playing an active role in enhanced ductility.

Date: 2020
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DOI: 10.1038/s41467-020-16085-z

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