| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Entropy Alloys IX: Alloy Development and Properties
|
| Presentation Title |
Friction Stir Gradient Alloying: A Novel High-throughput Screening Technique to Explore HCP to BCC Transformation in a γ-FCC Dominated High Entropy Alloy by V Addition |
| Author(s) |
Priyanka Agrawal, Shivakant Shukla, Sanya Gupta, Priyanshi Agrawal, Rajiv Mishra |
| On-Site Speaker (Planned) |
Priyanka Agrawal |
| Abstract Scope |
The compositional possibilities in high entropy alloys (HEAs) are vast; ergo effective strategies are needed for potential alloy chemistries. Friction stir gradient alloying (FSGA), a novel high-throughput solid-state screening technique is developed to create a library of composition and microstructure in HEAs. In the present study, FSGA aided the selection of suitable V concentration, ~1 at.%, which enabled the nucleation of α-bcc in a low stacking fault energy transforming high entropy alloy with dominant γ-fcc phase. This is the first observation of ε-hcp to α-bcc transformation in a TRIP-HEA and supports the Olson-Cohen model of martensitic transformation (γ-fcc (111) -> ε -hcp (10-11)-> α-bcc), where ε-hcp is the predecessor for the formation of α-bcc. The present work is the first to study the dual effect of chemistry and strain resulting in the co-existence of all three phases and details the evolution path of the transformation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Phase Transformations, Mechanical Properties |