Nanoscale insights into the damage tolerance of Cantor alloys at cryogenic temperatures
High-entropy alloys deform plastically and may also be at risk to fracture in extreme environments. In this paper, the damage tolerance of nanocrystalline Cantor alloys under mode I loading at cryogenic temperatures is investigated via molecular dynamics. We find that the damage tolerance is improve...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Online Access: | https://hdl.handle.net/10356/161778 |
| _version_ | 1826117689737740288 |
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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 | High-entropy alloys deform plastically and may also be at risk to fracture in extreme environments. In this paper, the damage tolerance of nanocrystalline Cantor alloys under mode I loading at cryogenic temperatures is investigated via molecular dynamics. We find that the damage tolerance is improved significantly with the decrease of temperature, in contrast to conventional metals. Deformation mechanism maps are constructed to assess the plasticity based on the grain size and temperature. Results show that the plastic deformation is governed by a synergy of face-centered-cubic to hexagonal closed-packed martensite transformation, twinning, stacking fault formation, grain boundary (GB) plasticity, and especially dynamic recovery. Specifically, a crossover from shear localization to solid-state amorphization is identified with the decrease of temperature and grain size. The amorphization at GBs dissipates larger strain energy, leading to precursor retardation and hence a high damage tolerance. A final deformation mechanism map is constructed to combine the deformation mechanisms and the crossover pathway from localization to amorphization. This map has great implications on improving the damage tolerance of Cantor alloy at cryogenic temperatures. |
| first_indexed | 2024-10-01T04:31:27Z |
| format | Journal Article |
| id | ntu-10356/161778 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:31:27Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1617782023-08-15T02:13:48Z Nanoscale insights into the damage tolerance of Cantor alloys at cryogenic temperatures Ji, Weiming Wu, Mao See School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Cantor Alloy Damage Tolerance High-entropy alloys deform plastically and may also be at risk to fracture in extreme environments. In this paper, the damage tolerance of nanocrystalline Cantor alloys under mode I loading at cryogenic temperatures is investigated via molecular dynamics. We find that the damage tolerance is improved significantly with the decrease of temperature, in contrast to conventional metals. Deformation mechanism maps are constructed to assess the plasticity based on the grain size and temperature. Results show that the plastic deformation is governed by a synergy of face-centered-cubic to hexagonal closed-packed martensite transformation, twinning, stacking fault formation, grain boundary (GB) plasticity, and especially dynamic recovery. Specifically, a crossover from shear localization to solid-state amorphization is identified with the decrease of temperature and grain size. The amorphization at GBs dissipates larger strain energy, leading to precursor retardation and hence a high damage tolerance. A final deformation mechanism map is constructed to combine the deformation mechanisms and the crossover pathway from localization to amorphization. This map has great implications on improving the damage tolerance of Cantor alloy at cryogenic temperatures. 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). 2022-09-20T01:12:43Z 2022-09-20T01:12:43Z 2022 Journal Article Ji, W. & Wu, M. S. (2022). Nanoscale insights into the damage tolerance of Cantor alloys at cryogenic temperatures. International Journal of Mechanical Sciences, 226, 107406-. https://dx.doi.org/10.1016/j.ijmecsci.2022.107406 0020-7403 https://hdl.handle.net/10356/161778 10.1016/j.ijmecsci.2022.107406 2-s2.0-85131458131 226 107406 en RG155/19 (S) International Journal of Mechanical Sciences 10.21979/N9/DG1D4H © 2022 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Cantor Alloy Damage Tolerance Ji, Weiming Wu, Mao See Nanoscale insights into the damage tolerance of Cantor alloys at cryogenic temperatures |
| title | Nanoscale insights into the damage tolerance of Cantor alloys at cryogenic temperatures |
| title_full | Nanoscale insights into the damage tolerance of Cantor alloys at cryogenic temperatures |
| title_fullStr | Nanoscale insights into the damage tolerance of Cantor alloys at cryogenic temperatures |
| title_full_unstemmed | Nanoscale insights into the damage tolerance of Cantor alloys at cryogenic temperatures |
| title_short | Nanoscale insights into the damage tolerance of Cantor alloys at cryogenic temperatures |
| title_sort | nanoscale insights into the damage tolerance of cantor alloys at cryogenic temperatures |
| topic | Engineering::Mechanical engineering Cantor Alloy Damage Tolerance |
| url | https://hdl.handle.net/10356/161778 |
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