| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2023
|
| Presentation Title |
A Structural Signature for Ductility in Chemically Complex Alloys |
| Author(s) |
Prashant Singh, Raymundo Arroyave, Duane D. Johnson |
| On-Site Speaker (Planned) |
Prashant Singh |
| Abstract Scope |
Similar to conventional refractory metal, existing body-centered cubic (bcc) refractory multi-principal element alloys (RMPEAs) lack room-temperature ductility. Local lattice distortions (LLD) – relative to average (x-ray) lattice positions – are generally expected in RMPEAs due to the varying complex chemical environments. We suggest a dimensionless metric to characterize ductility in MPEAs using LLD. With its innate quantum-mechanical origins, ductility is clearly affected by LLD arising from increased charge transfer due to atomic electronegativity differences in each varying environment. To validate, we choose RMPEAs, known as "Senkov alloys", that exhibit a range of ductility-brittleness. Our results permit a quick assessment of ductility to guide the design of more ductile high-temperature RMPEAs, and accelerated materials discovery if combined with machine-learning. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
High-Entropy Alloys, High-Temperature Materials, Computational Materials Science & Engineering |