| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Entropy Alloys IX: Alloy Development and Properties
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| Presentation Title |
Hierarchical Eutectoid Nano-lamellar Decomposition in an Al0.3CoFeNi Complex Concentrated Alloy |
| Author(s) |
Sriswaroop Dasari, Bharat Gwalani, Abhishek Sharma, Vishal Soni, Abhinav Jagetia, Stephane Gorsse, Rajarshi Banerjee |
| On-Site Speaker (Planned) |
Sriswaroop Dasari |
| Abstract Scope |
Guided by solution thermodynamics, phase decomposition has been tuned in the same Al0.3CoFeNi complex concentrated alloy (CCA), to develop a novel eutectoid-like nano-lamellar (FCC+L12) / (BCC+B2) microstructure versus a coarser scale FCC+B2 microstructure. This novel eutectoid nano-lamellar microstructure results from the complex interplay between Al-mediated lattice distortion (due to its larger atomic radius) in a face-centered cubic (FCC) CoFeNi solid solution, and a chemical ordering tendency leading to precipitation of ordered phases such as L12 and B2. The eutectoid microstructure is a result of solid-state decomposition of the FCC matrix and therefore distinct from the commonly reported eutectic microstructure in HEAs which results from solidification. The nano-lamellar microstructure exhibits a tensile yield strength of 1074 MPa with a tensile ductility ~ 8%, while the more damage-tolerant FCC+B2 microstructure, exhibits high tensile yield stress (~900 MPa) with appreciable tensile ductility (>20%). |
| Proceedings Inclusion? |
Planned: |