| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Microstructure and Physical Property Optimization in High Entropy Alloys
|
| Presentation Title |
Hierarchical Eutectoid Nano-lamellar Decomposition in an Al0.3CoFeNi Complex Concentrated Alloy |
| Author(s) |
Sriswaroop Dasari, Bharat Gwalani, Abhinav Jagetia, Vishal Soni, Stephane Gorsse, Rajarshi Banerjee |
| On-Site Speaker (Planned) |
Sriswaroop Dasari |
| Abstract Scope |
This talk reports a novel eutectoid nano-lamellar (FCC+L12) / (BCC+B2) microstructure that has been discovered in a relatively simple Al0.3CoFeNi high entropy alloy (HEA) or complex concentrated alloy (CCA). This 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. This novel nano-lamellar microstructure exhibits a tensile yield strength of 1074 MPa with a reasonable ductility of 8%. The same alloy can be tuned to form a more damage-tolerant FCC+B2 microstructure, retaining high tensile yield stress (~900 MPa) with appreciable tensile ductility (>20%), via annealing at 700°C. Such tunability of microstructures with dramatically different mechanical properties can be effectively engineered in the same CCA, by exploiting the complex interplay between ordering tendencies and lattice distortion. |