About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
|
Symposium
|
2nd World Congress on High Entropy Alloys (HEA 2021)
|
Presentation Title |
Solute-strengthening in Alloys with Short-range Order |
Author(s) |
Shankha Nag, William. A. Curtin |
On-Site Speaker (Planned) |
William. A. Curtin |
Abstract Scope |
Recent surging interest in strengthening of High Entropy Alloys (HEAs) with possible chemical ordering motivates the development of new theory. An existing theory for random alloys accounts for solute-dislocation and solute-solute interactions across the slip plane. Here, this theory has been extended to include strengthening due to short-range order (SRO) as characterized by the well-known Warren-Cowley SRO parameters. Closed form expressions are presented for the yield strength and energy barrier of dislocation motion in alloys with SRO based on inputs of atomic misfit volumes, average lattice and elastic constants, effective pair interactions and the SRO parameters. The predictive expression includes the average strengthening effect unique to SRO. The theory is applied to several HEAs with good success. This generalized solute-strengthening theory is the most comprehensive to date that is applicable to any alloys that are macroscopically homogeneous single-phase alloys and has inputs that can be measured or computed. |
Proceedings Inclusion? |
Undecided |