Journal
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
Volume 226, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmecsci.2022.107406
Keywords
Cantor alloy; Damage tolerance; Shear localization; Solid-state amorphization; Deformation mechanism
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Funding
- Ministry of Education, Singapore, under its Academic Research Fund Tier 1 [RG155/19 (S)]
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In this paper, the damage tolerance of nanocrystalline Cantor alloys under cryogenic temperatures is investigated via molecular dynamics. It is found that the damage tolerance is significantly improved with the decrease of temperature, and deformation mechanism maps are constructed to explain the phenomenon.
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.
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