|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Late News Poster Session
||Quasi-hydrostatic Quasi-constrained Severe Plastic Deformation of Ternary Medium Entropy Alloy
||Saumya Jha, Krishanu Biswas, N P Gurao
|On-Site Speaker (Planned)
Many recent investigations have shown medium-entropy-alloys exhibiting better mechanical properties than their high-entropy counterparts. Besides a high contribution from friction-stresses and solid-solution-strengthening, strain-hardening is an important contributor to the strength observed in these systems. Severe-plastic-deformation(SPD) techniques like High-Pressure-Torsion(HPT) incorporate very high shear-strain in the material, leading to ultrafine-grained(UFG) microstructures, which cause manifold increase in strength. This work shows the variation in mechanical properties at different radial displacements from the center of HPT tested FeMnNi(low-SFE FCC-alloy) synthesized by casting-route, which shows significantly higher toughness than its high-entropy counterparts like Cantor-alloy. The gradient in grain-sizes along the radial-direction of these specimens has been modeled using microstructure-entropy for predicting the mechanical properties, which has also been validated by indentation-tests. The dislocation-density is computed by FEM-simulations for varying strains and validated by analyzing synchrotron-diffraction data. Thus, the model can be utilized to predict the strengthening behavior of similar systems subjected to quasi-hydrostatic loading conditions.
||High-Entropy Alloys, Mechanical Properties, Modeling and Simulation