About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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| Presentation Title |
Microstructure Evolution and Fatigue Properties of CP-Ti Induced by Cryogenic Low Cycle Fatigue |
| Author(s) |
Ji Seob An, Seung-Hyun Yeo, A-Ra Jo, Myeong-Sik Jeong, Sang-Kon Lee, Sun-Kwang Hwang |
| On-Site Speaker (Planned) |
Sun-Kwang Hwang |
| Abstract Scope |
Mechanical twinning significantly influences Ti's plastic deformation, especially under cryogenic conditions where it enhances strength and ductility. However, twinning's role in cyclic deformation under low-cycle fatigue (LCF) remains unclear. This study investigated twinning and detwinning behavior of commercially pure titanium (CP-Ti) under cryogenic LCF loading versus room temperature (RT). Strain-controlled LCF tests were performed at ±2.0% strain amplitude. Ex-situ electron backscatter diffraction analysis revealed significantly increased twin fraction in cryogenic temperature (CT) specimens versus RT. Twin length increased during early fatigue stages, with most detwinning occurring during reverse-loading. Microstructural evolution after LCF at CT, including twin activation, residual twinning, and grain refinement, contributed to improved mechanical properties such as fatigue stress and life, validated through Hall-Petch relationship and Taylor hardening law. These findings establish links between twinning behavior, microstructural changes, and fatigue properties in CP-Ti at CT. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Environmental Effects, Characterization |