| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
|
| Presentation Title |
Interplay Between Lattice Distortion and Bond Stiffness Towards Strengthening of Refractory BCC High Entropy Alloys |
| Author(s) |
Dharmendra Pant, Dilpuneet S. Aidhy |
| On-Site Speaker (Planned) |
Dilpuneet S. Aidhy |
| Abstract Scope |
In general, a positive correlation between tensile strength and elastic modulus is observed, where addition of a stronger element is expected to increase both the strength and elastic modulus of a given alloy. Our density functional theory (DFT) calculations explain an opposite experimentally observed trend, i.e., addition of a softer element enhances the yield strength in high entropy alloys (HEAs). We show that the underlying mechanism is the weaker bond stiffness of the softer element that causes larger local lattice distortion. Higher lattice distortion pins the movement of dislocations causing solid solution strengthening in body-centered cubic (BCC) refractory HEAs. We show this unintuitive behavior in Ti-based HEAs, i.e., TixMoNbTaW, where the strength increases but elastic modulus decreases with addition of softer Ti. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Computational Materials Science & Engineering |