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...

وصف كامل

محفوظ في:
التفاصيل البيبلوغرافية
المؤلفون الرئيسيون: Ji, Weiming, Wu, Mao See
مؤلفون آخرون: School of Mechanical and Aerospace Engineering
التنسيق: مقال
اللغة:English
منشور في: 2022
الموضوعات:
الوصول للمادة أونلاين:https://hdl.handle.net/10356/161778
الوسوم: إضافة وسم
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المؤسسة: Nanyang Technological University
اللغة: English
الوصف
الملخص: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.