About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Role of Twins on Localization of Cyclic Strain and Fatigue Crack Initiation in CrCoNi Medium-entropy Alloy |
Author(s) |
Veronika Mazanova, Mulaine Shih, Milan Heczko, Connor E. Slone, Easo George, Jaroslav Polak, Maryam Ghazisaeidi, Michael J. Mills |
On-Site Speaker (Planned) |
Veronika Mazanova |
Abstract Scope |
Mechanical properties and mechanism related to monotonic deformation has been thoroughly studied in MPEs. However, there remains a lack of knowledge about the fatigue behavior and associated mechanisms. In the current work, attention is focused on the localization of cyclic strain in the equiatomic CrCoNi alloy in fully recrystallized microstructural state. Although the alloy is characterized by high fraction of annealing twin boundaries, the early fatigue-induced surface relief is found to occur preferentially along thin deformation twins. The effect of twin size on the preferential localization of cyclic strain and fatigue crack initiation was studied using a sophisticated experimental workflow designed to extract information from the surface and the bulk of tested material by SEM, EBSD, ECCI, FIB and HR-STEM. Experimental results are complemented by atomistic modeling of the local stress states in association with different twin sizes under an applied load. |
Proceedings Inclusion? |
Planned: |