|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Phase Field Modelling of Transformation Pathways and Microstructural Evolution in Multi-Principal Element Alloys (MPEAs)
||Kamalnath Kadirvel, Zachary Kloenne, Jacob K Jensen, Shalini Roy Koneru, Hamish Fraser, Yunzhi Wang
|On-Site Speaker (Planned)
The refractory MPEA, AlMo0.5NbTa0.5TiZr, exhibits an interesting microstructure with ordered B2 phase being the matrix and a disordered bcc phase being the precipitate, unlike the conventional Ni-based superalloys where the ordered phase is the precipitate and the disordered phase is the matrix. It is crucial to understand the phase transformation pathways (PTPs) in these alloys in order to tailor the microstructure for specific engineering applications. In this work, we systematically investigated the possible PTPs in B2/bcc MPEAs through phase-field modelling. Our phase-field model (PFM) incorporates the phase-transformation processess such as order-disorder transitions, precipitation and spinodal decomposition. We studied the effects of volume fraction of individual phases, lattice misfit between the phases, modulus mismatch between the phases and the free energies of the individual phases on the microstructural evolution of these MPEAs. Our parameteric study can help in designing the alloy composition and heat-treatment schedule for tuning the microstructural features.
||High-Entropy Alloys, Modeling and Simulation, Phase Transformations