|About this Abstract
||3rd World Congress on High Entropy Alloys (HEA 2023)
||Microstructural Engineering in HEAs Undergoing Spinodal Assisted Phase Transformations
||Shalini Roy Koneru, Kamal Kadirvel, Zachary Kloenne, Hamish Fraser, Yunzhi Wang
|On-Site Speaker (Planned)
||Shalini Roy Koneru
Researchers attributed the recently observed nano-scale periodic multi-phase microstructures in HEAs such as AlMo0.5NbTa0.5TiZr, Al0.5NbTa0.8Ti1.5V0.2Zr, TiZrNbTa and Fe15Co15Ni20Mn20Cu30 to spinodal assisted phase transformation pathways (PTPs). Microstructures in such HEAs could be further engineered by studying the underlying PTPs in detail and identifying the critical alloy and processing parameters affecting the microstructural evolution. Thus, through phase-field simulations, we investigated the effect of interplay between different alloy parameters such as volume fraction of, lattice misfit and modulus mismatch between coexisting phases on microstructure topology in HEAs undergoing spinodal assisted PTPs. We further systematically investigated the effect of different heat treatments such as isothermal aging vs continuous cooling vs two-step heat treatments on microstructural evolution. It is demonstrated that the microstructural topology could be inverted by appropriate selection of alloy composition and heat treatment design. Further, we illustrate that a range of hierarchical microstructures could be designed in HEAs undergoing spinodal assisted PTPs.
||Planned: Metallurgical and Materials Transactions