|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Exceptional Strength-ductility Combination in an FCC Based High Entropy Alloy
||Bharat Gwalani, Sriswaroop Dasari, Vishal Soni, Shivakant Shukla, Abhinav Jagetia, Priyanshi Agrawal, Rajiv S. Mishra, Rajarshi Banerjee
|On-Site Speaker (Planned)
We designed a novel precipitation strengthened high entropy alloy (HEA) composition based on high fraction of L12 precipitates strengthening a face-centered cubic (FCC) matrix, using an iterative CALPHAD-based approach. By optimizing the alloying additions, the FCC + L12 phase field was stabilized to 1150°C while maintaining a high L12 phase fraction at 1000°C. Thermo-mechanical processing resulted in concurrent recrystallization and L12 precipitation, with the alloy retaining a homogeneous sub-micron grain size along with a high density of nano-lamellar L12 precipitates. This microstructure exhibits high YS strength ~1650 MPa with a tensile ductility ~15%, and an ultimate tensile strength ~1800 MPa. Our results show that the combination of overall compositional optimization of the alloy coupled with the nano-lamellar morphology of the L12 ordered precipitates help in maintaining a reasonably high ductility within such a fine-grained precipitation strengthened HEA. This is the best strength-ductility combination reported till now in any bulk HEA.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume