About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Temperature-Dependent Cyclic Deformation Behavior of MP35N Alloy |
| Author(s) |
Shubham Sisodia, Akshat Godha, Surendra Kumar Makineni, Ankur Chauhan |
| On-Site Speaker (Planned) |
Shubham Sisodia |
| Abstract Scope |
This study examines the low-cycle fatigue (LCF) behavior of an MP35N alloy (35% Co, 35% Ni, 20% Cr, 10% Mo by weight), emphasizing its microstructural evolution at room temperature and 550 °C. Fatigue tests were conducted in the air under fully reversed, strain-controlled conditions with a strain amplitude of ±0.5%. The findings reveal notable differences in fatigue response, providing insights into the temperature-dependent deformation and damage mechanisms. The cyclic stress response exhibited distinct phases: an initial cyclic hardening stage, a quasi-stable cyclic phase, and eventual failure. Electron microscopy analysis after failure shows that dislocation planar slip, stacking faults, deformation twinning, and the FCC-to-HCP phase transformation contributed to deformation at room temperature. At 550 °C, serrated plastic flow was additionally observed, attributed to interactions between mobile dislocations and diffusing solute atoms. Segregation near grain boundaries at elevated temperatures was observed, appearing to negatively impact fatigue life. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Copper / Nickel / Cobalt, High-Temperature Materials |