| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Discrepancy in Low Cycle Fatigue and Creep-Fatigue Life of 720Li Alloy Tested at 720◦C : Role of Crystallographic Texture Evolution |
| Author(s) |
PS Manoranjan Jena, Snehashish Tripathy, Sumanta Kumar Pradhan, B Ravi Kumar, N. Paulose, Jitendra Kumar Sahu |
| On-Site Speaker (Planned) |
PS Manoranjan Jena |
| Abstract Scope |
The LCF and CF interaction behaviour of 720Li alloy were studied at 720°C with varying Δεt/2 and hold times (HT). At Δεt/2 = 0.6%, CF-life was found to be less than LCF-life. However, at Δεt/2 = 0.44, 0.48, and 0.55%, CF-life increased with an increase in HT. Texture analysis revealed rotated initial loading directions in both LCF and CF conditions. Texture components developed in CF-specimens at Δεt/2 = 0.6% were similar to those in LCF-specimens at Δεt/2 = 0.44%. This texture evolution, attributed to multi-planar slip under compressive loads, led to intercrystalline cracking due to latent strain hardening and strain incompatibility. High static interfacial energy of annealing twin boundaries resulted in their cracking in LCF at Δεt/2 = 0.44% and CF at Δεt/2 = 0.6%. In contrast, the evolution of low-modulus texture components was responsible for higher life in CF at Δεt/2 = 0.44% and LCF at Δεt/2 = 0.6%. |
| Proceedings Inclusion? |
Planned: |