High-content ductile coherent nanoprecipitates achieve ultrastrong high-entropy alloys

Yao-Jian Liang, Linjing Wang, Yuren Wen, Baoyuan Cheng, Qinli Wu, Tangqing Cao, Qian Xiao, Yunfei Xue (), Gang Sha, Yandong Wang, Yang Ren, Xiaoyan Li (), Lu Wang, Fuchi Wang () and Hongnian Cai
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Yao-Jian Liang: Beijing Institute of Technology
Linjing Wang: Beijing Institute of Technology
Yuren Wen: Chinese Academy of Sciences
Baoyuan Cheng: Beijing Institute of Technology
Qinli Wu: Nanjing University of Science and Technology
Tangqing Cao: Beijing Institute of Technology
Qian Xiao: Beijing Institute of Technology
Yunfei Xue: Beijing Institute of Technology
Gang Sha: Nanjing University of Science and Technology
Yandong Wang: University of Science and Technology Beijing
Yang Ren: Argonne National Laboratory
Xiaoyan Li: Tsinghua University
Lu Wang: Beijing Institute of Technology
Fuchi Wang: Beijing Institute of Technology
Hongnian Cai: Beijing Institute of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Precipitation-hardening high-entropy alloys (PH-HEAs) with good strength−ductility balances are a promising candidate for advanced structural applications. However, current HEAs emphasize near-equiatomic initial compositions, which limit the increase of intermetallic precipitates that are closely related to the alloy strength. Here we present a strategy to design ultrastrong HEAs with high-content nanoprecipitates by phase separation, which can generate a near-equiatomic matrix in situ while forming strengthening phases, producing a PH-HEA regardless of the initial atomic ratio. Accordingly, we develop a non-equiatomic alloy that utilizes spinodal decomposition to create a low-misfit coherent nanostructure combining a near-equiatomic disordered face-centered-cubic (FCC) matrix with high-content ductile Ni3Al-type ordered nanoprecipitates. We find that this spinodal order–disorder nanostructure contributes to a strength increase of ~1.5 GPa (>560%) relative to the HEA without precipitation, achieving one of the highest tensile strength (1.9 GPa) among all bulk HEAs reported previously while retaining good ductility (>9%).

Date: 2018
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DOI: 10.1038/s41467-018-06600-8

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