| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Computational Thermodynamics and Kinetics
|
| Presentation Title |
Solution thermodynamics guided tuning of local chemical ordering in high entropy alloys to achieve high strength and ductility (INVITED TALK) |
| Author(s) |
Sriswaroop Dasari, Abhishek Sharma, Chao Jiang, Bharat Gwalani, Stephane Gorsse, An-Chou Yeh, Srinivasan G. Srivilliputhur, Rajarshi Banerjee |
| On-Site Speaker (Planned) |
Rajarshi Banerjee |
| Abstract Scope |
A simple thermodynamic framework, based solely on binary enthalpies of mixing has been developed, to select optimal alloying elements to control the nature and extent of chemical ordering in high entropy alloys (HEAs). High resolution electron microscopy, atom probe tomography, hybrid Monte-Carlo, Special Quasirandom Structures, and density functional theory calculations have been coupled to demonstrate how controlled additions of Al and Ti and subsequent annealing drive chemical ordering in nearly random equiatomic face-centered cubic CoFeNi solid solution. Specifically, a progressively increasing local order boosts the tensile yield strengths of the parent CoFeNi alloy by a factor of four while also substantially improving ductility, which breaks the so-called strength-ductility paradox. The generality of this approach has been validated by predicting and demonstrating that controlled additions of Al to another nearly random body-centered cubic refractory NbTaTi HEA, also introduces chemical ordering and enhances mechanical properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, High-Entropy Alloys, ICME |