|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Roles of Martensitic Phase Fractions in Mechanical Behavior of TRIP-HEA
||Sichao Fu, Dunji Yu, Yan Chen, Ke An
|On-Site Speaker (Planned)
The transformation-induced plasticity high entropy alloy (TRIP-HEA) pushes the envelope of the strength and ductility tradeoff. As revealed by the in-situ neutron diffraction, the FCC-based TRIP-HEA is strengthened by persisting transformation to the hard HCP phase with a potential work-hardening capacity. The initial HCP phase fraction and the successive transformation under deformation can be controlled by the annealing process. With less than 30% HCP fraction variation after thermal treatment, the TRIP-HEA could show over ~150 MPa higher stress level for a higher initial HCP fraction. The underlying complex mechanisms involve the contributions of critical stresses of transformation, dislocation slip and twinning, but the dominant contributor is the strengthening of increasing stress-induced hard HCP phase in the early deformation stage. An empirical direction combining one in-situ neutron measurement with a semi-empirical constitutive model is proposed to predict the change in mechanical response with different HCP phase fractions.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume