| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Entropy Alloys IX: Structures and Modeling
|
| Presentation Title |
Revisit the VEC Rule in High Entropy Alloys (HEAs) with High-throughput CALPHAD Approach and Its Applications for Material Design: A Case Study with Al-Co-Cr-Fe-Ni System |
| Author(s) |
Songge Yang, Jun Lu, Fangzhou Xing, Lijun Zhang, Yu Zhong |
| On-Site Speaker (Planned) |
Songge Yang |
| Abstract Scope |
Valence electron concentration (VEC) was treated as a useful parameter to predict solid solution phases, and the VEC rule was proposed for high entropy alloys (HEAs). However, this empirical rule has its limitations. In this paper, we revisited the empirical VEC rule with the HT-CALPHAD approach in the Al-Co-Cr-Fe-Ni system. Meanwhile, we proposed a data screening procedure to classify and discover the new HEAs. The concepts of average density (ρ_HEA), highest BCC/FCC temperatures (T_(BCC/FCC)^max), and temperature ranges (∆T_(BCC/FCC)) were introduced as data screening criteria to down-screen the candidate alloy compositions for specific engineering applications. In the current work, we have identified three HEA categories (refractory BCC HEAs, light-weight BCC HEA and refractory FCC HEAs) in this system and proposed the best candidate in each group. More importantly, our investigation showed the HEA non-equiatomic composition space provides ample opportunities for the discovery of the next-generation HEAs. |
| Proceedings Inclusion? |
Planned: TMS Journal: Metallurgical and Materials Transactions |