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...

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Main Authors: Ji, Weiming, Wu, Mao See
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/161778
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.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.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Mechanical engineering
Cantor Alloy
Damage Tolerance
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
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.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Ji, Weiming
Wu, Mao See
format Article
author Ji, Weiming
Wu, Mao See
author_sort Ji, Weiming
title 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_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_sort nanoscale insights into the damage tolerance of cantor alloys at cryogenic temperatures
publishDate 2022
url https://hdl.handle.net/10356/161778
_version_ 1779156373139881984