About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys V: Mechanical Behavior
|
| Presentation Title |
Integration of micromechanical modeling and in situ neutron diffractions for the ductility studies of novel high entropy alloys |
| Author(s) |
Yanfei Gao, Lia Amalia, Zongyang Lyu, Peter K Liaw |
| On-Site Speaker (Planned) |
Yanfei Gao |
| Abstract Scope |
The ductility improvement can be efficiently accomplished by designing a number of hardening mechanisms that operate successively and thus sustain a continuously increasing work hardening rate (or at least not decreasing rapidly). We propose a novel mechanics approach to extract the tangent moduli of each constituent phase and diffraction-selected grain families from in situ neutron diffraction measurements, thus permitting a quantitative assessment of hardening-rate contributions from each individual mechanism. Two examples are given, including a metastable Fe49.5Mn30Co10Cr10C0.5 alloy (at.%) and a nanoprecipitation-strengthened (FeCoNi)86Al7Ti7 (at.%) alloy. It is found that the yielding and hardening-rate sequences can be extracted and compared to the successive load sharing mechanisms. The quantification of tangent moduli and successive hardening mechanisms from in situ neutron diffraction contrast sharply with prior qualitative studies in literature (e.g., post-mortem or interrupted characterizations). A new ductilization strategy is proposed, based on maximizing differences in all tangent moduli. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Modeling and Simulation |