|About this Abstract
||Materials Science & Technology 2020
||High Entropy Materials: Concentrated Solid Solution, Intermetallics, Ceramics, Functional Materials and Beyond
||Highly Tunable Mechanical and Magnetic Properties in an Al0.3CoFeNi Complex Concentrated Alloy
||Sriswaroop Dasari, Varun Chaudhary, Bharat Gwalani, Abhinav Jagetia, Vishal Soni, Stephane Gorsse, Raju V. Ramanujan, Rajarshi Banerjee
|On-Site Speaker (Planned)
This talk will focus on the microstructure-mechanical-magnetic property relationships in an Al0.3CoFeNi high entropy alloy (HEA) or complex concentrated alloy (CCA). A novel nano-lamellar (FCC+L12) / (BCC+B2) microstructure was discovered in this alloy, exhibiting 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. The FCC+B2 microstructure exhibits soft magnetic properties with saturation magnetization (Ms) of ~127 emu/g and coercivity (Hc) of ~151 A/m. The semi-hard nano-lamellar microstructure exhibits Ms ~138 emu/g and high Hc ~12732 A/m. This corresponds to more than eighty times increase in Hc and double the hardness in the same alloy. These results demonstrate the feasibility of producing a range of mechanical and magnetic properties by thermo-mechanical treatment of a single CCA composition.