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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 700C. 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.
Proceedings Inclusion? Planned: None Selected

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

3D Twinning in High Entropy Alloys
Hierarchical Eutectoid Nano-lamellar Decomposition in an Al0.3CoFeNi Complex Concentrated Alloy
On the Low Cycle Fatigue Response of CoCrNiFeMn High Entropy Alloy with Ultra-fine Grain Structure
Short-range Atomic Order Drives Exceptional Mechanical Properties of Multi-principal Element Alloys

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