About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Advances in Multi-Principal Element Alloys III: Mechanical Behavior
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Presentation Title |
Enhancing Fatigue Life by Ductile-transformable Multicomponent B2 Precipitates in a High-entropy Alloy |
Author(s) |
Peter Liaw, Rui Feng, You Rao, Chuhao Liu, Xie Xie, Dunji Yu, Yan Chen, Maryam Ghazisaeidi, Ungar Tamas, Huamiao Wang, Ke An |
On-Site Speaker (Planned) |
Peter Liaw |
Abstract Scope |
Fatigue failures in engineering structures can cause catastrophic accidents without obvious warning. Thus, fundamentally understanding cyclic-deformation and fatigue-failure mechanisms is critical for developing fatigue-resistant structural materials. Here we report a ductile multicomponent B2 precipitates-strengthened high-entropy alloy (HEA), which exhibits the outperforming fatigue life, relative to traditional materials, at low strain amplitudes. Its real-time cyclic-deformation mechanisms are revealed by in-situ neutron diffraction, transmission-electron microscopy, crystal-plasticity modeling, and Monte-Carlo simulation. Multiple cyclic-deformation mechanisms, including dislocation slips, multicomponent-precipitation strengthening, deformation twinning, and reversible stress-induced martensitic transformation, are observed in the studied HEA. Its excellent fatigue performance is attributed to the outstanding fatigue-crack-initiation resistance, resulting from the high elasticity, plastic deformability, and martensitic transformation of the B2 phase that leads to the effective load redistribution and strain partitioning with the face-centered-cubic (FCC) matrix. Guided by this study, fatigue-resistant alloys strengthened by ductile multicomponent intermetallic phases can be developed. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Mechanical Properties, Characterization |