Room-temperature super-elongation in high-entropy alloy nanopillars

Qian Zhang, Ranming Niu, Ying Liu, Jiaxi Jiang, Fan Xu, Xuan Zhang, Julie M. Cairney, Xianghai An (), Xiaozhou Liao (), Huajian Gao () and Xiaoyan Li ()
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Qian Zhang: Tsinghua University
Ranming Niu: The University of Sydney
Ying Liu: The University of Sydney
Jiaxi Jiang: Tsinghua University
Fan Xu: Fudan University
Xuan Zhang: Tsinghua University
Julie M. Cairney: The University of Sydney
Xianghai An: The University of Sydney
Xiaozhou Liao: The University of Sydney
Huajian Gao: Nanyang Technological University
Xiaoyan Li: Tsinghua University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Nanoscale small-volume metallic materials typically exhibit high strengths but often suffer from a lack of tensile ductility due to undesirable premature failure. Here, we report unusual room-temperature uniform elongation up to ~110% at a high flow stress of 0.6–1.0 GPa in single-crystalline -oriented CoCrFeNi high-entropy alloy nanopillars with well-defined geometries. By combining high-resolution microscopy and large-scale atomistic simulations, we reveal that this ultrahigh uniform tensile ductility is attributed to spatial and synergistic coordination of deformation twinning and dislocation slip, which effectively promote deformation delocalization and delay necking failure. These joint and/or sequential activations of the underlying displacive deformation mechanisms originate from chemical compositional heterogeneities at the atomic level and resulting wide variations in generalized stacking fault energy and associated dislocation activities. Our work provides mechanistic insights into superplastic deformations of multiple-principal element alloys at the nanoscale and opens routes for designing nanodevices with high mechanical reliability.

Date: 2023
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DOI: 10.1038/s41467-023-42894-z

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