Retainable short-range order effects on the strength and toughness of NbMoTaW refractory high-entropy alloys
Short range order (SRO) can affect the dislocation glide and twin nucleation in high-entropy alloys (HEAs), leading to varying mechanical performance. However, the mechanical implications of SRO in refractory HEAs (RHEAs) remain largely unknown due to the lack of understanding of the nanoscale defor...
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| 其他作者: | |
| 格式: | Journal Article |
| 语言: | English |
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2022
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| 在线阅读: | https://hdl.handle.net/10356/163477 |
| _version_ | 1826121307746467840 |
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| author | Ji, Weiming Wu, Mao See |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Ji, Weiming Wu, Mao See |
| author_sort | Ji, Weiming |
| collection | NTU |
| description | Short range order (SRO) can affect the dislocation glide and twin nucleation in high-entropy alloys (HEAs), leading to varying mechanical performance. However, the mechanical implications of SRO in refractory HEAs (RHEAs) remain largely unknown due to the lack of understanding of the nanoscale deformation. Here, the role of SRO on the tensile mechanical properties of single crystal equiatomic NbMoTaW RHEAs is investigated using the hybrid Monte Carlo method and molecular dynamics simulation. We find that the presence of SRO can simultaneously enhance the strength and toughness over a wide range of temperatures under very fast strain rate. The enhancement is larger at lower temperature due to higher degree of SRO. The effects of SRO strengthening and toughening are retainable after unloading from the plastic stage, due to the unexpected twinning-assisted pseudo-elastic deformation. The fundamental principles of SRO are provided to facilitate the rational design and applications of RHEAs. |
| first_indexed | 2024-10-01T05:30:31Z |
| format | Journal Article |
| id | ntu-10356/163477 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:30:31Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1634772023-08-15T02:12:06Z Retainable short-range order effects on the strength and toughness of NbMoTaW refractory high-entropy alloys Ji, Weiming Wu, Mao See School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Short-Range Ordering Pseudo-Elastic Deformation Short range order (SRO) can affect the dislocation glide and twin nucleation in high-entropy alloys (HEAs), leading to varying mechanical performance. However, the mechanical implications of SRO in refractory HEAs (RHEAs) remain largely unknown due to the lack of understanding of the nanoscale deformation. Here, the role of SRO on the tensile mechanical properties of single crystal equiatomic NbMoTaW RHEAs is investigated using the hybrid Monte Carlo method and molecular dynamics simulation. We find that the presence of SRO can simultaneously enhance the strength and toughness over a wide range of temperatures under very fast strain rate. The enhancement is larger at lower temperature due to higher degree of SRO. The effects of SRO strengthening and toughening are retainable after unloading from the plastic stage, due to the unexpected twinning-assisted pseudo-elastic deformation. The fundamental principles of SRO are provided to facilitate the rational design and applications of RHEAs. Ministry of Education (MOE) This research is supported by the Ministry of Education, Singapore, under its Academic Research Fund Tier 1, Project Number RG155/19 (S). 2022-12-07T05:32:41Z 2022-12-07T05:32:41Z 2022 Journal Article Ji, W. & Wu, M. S. (2022). Retainable short-range order effects on the strength and toughness of NbMoTaW refractory high-entropy alloys. Intermetallics, 150, 107707-. https://dx.doi.org/10.1016/j.intermet.2022.107707 0966-9795 https://hdl.handle.net/10356/163477 10.1016/j.intermet.2022.107707 2-s2.0-85137095706 150 107707 en RG155/19 (S) Intermetallics doi:10.21979/N9/DG1D4H © 2022 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Short-Range Ordering Pseudo-Elastic Deformation Ji, Weiming Wu, Mao See Retainable short-range order effects on the strength and toughness of NbMoTaW refractory high-entropy alloys |
| title | Retainable short-range order effects on the strength and toughness of NbMoTaW refractory high-entropy alloys |
| title_full | Retainable short-range order effects on the strength and toughness of NbMoTaW refractory high-entropy alloys |
| title_fullStr | Retainable short-range order effects on the strength and toughness of NbMoTaW refractory high-entropy alloys |
| title_full_unstemmed | Retainable short-range order effects on the strength and toughness of NbMoTaW refractory high-entropy alloys |
| title_short | Retainable short-range order effects on the strength and toughness of NbMoTaW refractory high-entropy alloys |
| title_sort | retainable short range order effects on the strength and toughness of nbmotaw refractory high entropy alloys |
| topic | Engineering::Mechanical engineering Short-Range Ordering Pseudo-Elastic Deformation |
| url | https://hdl.handle.net/10356/163477 |
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