| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
|
| Presentation Title |
Study of the Serration Deformation Mechanisms at 15 K |
| Author(s) |
You Sub Kim, Taeuk Kang, Soon-Ku Hong, Jamieson Brechtl, Mikhail Lebyodkin, Yi-Hsuan Cheng, E-Wen Huang, Peter K. Liaw, Stefanus Harjo, Wu Gong, Soo Yeol Lee |
| On-Site Speaker (Planned) |
You Sub Kim |
| Abstract Scope |
Materials researches on cryogenic industries, such as liquid hydrogen and aerospace, have recently drawn large attention on materials science field. This study investigates the deformation mechanisms and serration behaviors in stainless steel 316L under ultra-cryogenic temperatures of 15 K. Our research highlights the influence of negative strain rate sensitivity on flow stress and the rate-dependent nature of low-temperature serration deformation (LTSD). We introduce a thermal-induced dislocation dynamic theory, attributing the primary cause of LTSD to unique dislocation behaviors arising from severely limited thermal vibration energy at 15 K. This condition leads to the development of hierarchical dislocation networks and multiple lattice defects. Furthermore, localized heating from dislocation avalanches and plastic deformation critically impact the LTSD behavior, resulting in diverse types of the LTSD. This foundational research enhances our understanding of rate-dependent LTSD mechanisms, which paves the way for innovative material designs in cryogenic applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Environmental Effects, Mechanical Properties |