Room-temperature super-elongation in high-entropy alloy nanopillars
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 <11...
| Main Authors: | , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Online Access: | https://hdl.handle.net/10356/173007 |
| _version_ | 1811695895291363328 |
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| author | Zhang, Qian Niu, Ranming Liu, Ying Jiang, Jiaxi Xu, Fan Zhang, Xuan Cairney, Julie M. An, Xianghai Liao, Xiaozhou Gao, Huajian Li, Xiaoyan |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Zhang, Qian Niu, Ranming Liu, Ying Jiang, Jiaxi Xu, Fan Zhang, Xuan Cairney, Julie M. An, Xianghai Liao, Xiaozhou Gao, Huajian Li, Xiaoyan |
| author_sort | Zhang, Qian |
| collection | NTU |
| description | 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 <110>-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. |
| first_indexed | 2024-10-01T07:30:44Z |
| format | Journal Article |
| id | ntu-10356/173007 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:30:44Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1730072024-01-13T16:48:26Z Room-temperature super-elongation in high-entropy alloy nanopillars Zhang, Qian Niu, Ranming Liu, Ying Jiang, Jiaxi Xu, Fan Zhang, Xuan Cairney, Julie M. An, Xianghai Liao, Xiaozhou Gao, Huajian Li, Xiaoyan School of Mechanical and Aerospace Engineering Institute of High Performance Computing, A*STAR Engineering::Mechanical engineering Electron Energy Loss Spectroscopy Room Temperature 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 <110>-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. Published version X.Y.L. acknowledges financial support from the National Natural Science Foundation of China (grant numbers 12325203, 91963117, and 11921002). X.A. acknowledges support from the Australian Research Council under DE170100053 and DP23010228, from The University of Sydney under the Robinson Fellowship Scheme and from The University of Sydney Nano Institute under the Kickstarter Funding. X.Z.L. acknowledges financial support from the Australian Research Council grant DP190102243. R.N. is grateful for the financial support from the China Scholarship Council (student ID 201506840096). 2024-01-09T00:39:11Z 2024-01-09T00:39:11Z 2023 Journal Article Zhang, Q., Niu, R., Liu, Y., Jiang, J., Xu, F., Zhang, X., Cairney, J. M., An, X., Liao, X., Gao, H. & Li, X. (2023). Room-temperature super-elongation in high-entropy alloy nanopillars. Nature Communications, 14(1), 7469-. https://dx.doi.org/10.1038/s41467-023-42894-z 2041-1723 https://hdl.handle.net/10356/173007 10.1038/s41467-023-42894-z 37978189 2-s2.0-85176907509 1 14 7469 en Nature Communications © 2023 The Author(s). Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/ licenses/by/4.0/. application/pdf |
| spellingShingle | Engineering::Mechanical engineering Electron Energy Loss Spectroscopy Room Temperature Zhang, Qian Niu, Ranming Liu, Ying Jiang, Jiaxi Xu, Fan Zhang, Xuan Cairney, Julie M. An, Xianghai Liao, Xiaozhou Gao, Huajian Li, Xiaoyan Room-temperature super-elongation in high-entropy alloy nanopillars |
| title | Room-temperature super-elongation in high-entropy alloy nanopillars |
| title_full | Room-temperature super-elongation in high-entropy alloy nanopillars |
| title_fullStr | Room-temperature super-elongation in high-entropy alloy nanopillars |
| title_full_unstemmed | Room-temperature super-elongation in high-entropy alloy nanopillars |
| title_short | Room-temperature super-elongation in high-entropy alloy nanopillars |
| title_sort | room temperature super elongation in high entropy alloy nanopillars |
| topic | Engineering::Mechanical engineering Electron Energy Loss Spectroscopy Room Temperature |
| url | https://hdl.handle.net/10356/173007 |
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