| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Elements Alloys X: Alloy Development and Properties
|
| Presentation Title |
Predicting Temperature-dependent Ultimate Strengths of BCC High-entropy Alloys |
| Author(s) |
Baldur Steingrimsson, Xuesong Fan, Michael Gao, Peter Liaw |
| On-Site Speaker (Planned) |
Xuesong Fan |
| Abstract Scope |
This presentation expands on a bilinear log model, for predicting temperature-dependent ultimate strength of high-entropy alloys (HEAs) based on 21 compositions. We consider the break temperature introduced, Tbreak, an important design parameter. The presentation also addresses trilinear and quad-linear versions of the log model and explains why they may be appropriate for select single-crystal, Nickel-based super-alloys, such as CMSX-4, exhibiting an anomalous yield strength phenomenon. Here, the yield strength increases with temperature, resulting in a hump between low- and high-temperature regimes, due to thermally activated cross slip of dislocations from octahedral {111} planes to cubic {100} planes. This cross slip occurs with increasing ease as temperature increases. We show that most refractory HEAs contain BCC or HCP phases, with different dislocation systems. Therefore, it is unlikely that cross slip from {111} to (100) will happen in refractory HEAs. We expect the bilinear log model to suffice for most refractory HEAs. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Modeling and Simulation, Mechanical Properties |