About this Abstract |
Meeting |
MS&T23: Materials Science & Technology
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Symposium
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High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond IV
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Presentation Title |
Mechanical Behaviour of a Low-SFE FCC Ternary Medium Entropy Alloy Subjected to High Pressure Torsion |
Author(s) |
Saumya Ranjan Jha, Krishanu Biswas, Nilesh Prakash Gurao |
On-Site Speaker (Planned) |
Saumya Ranjan Jha |
Abstract Scope |
Recent studies have revealed that medium-entropy alloys have superior mechanical-characteristics to their high-entropy counterparts. Strain-hardening is a significant contributor to the strength observed in these systems, in addition to a significant contribution from friction-stresses and solid-solution-strengthening. Ultrafine-grained(UFG) microstructures, which result from severe-plastic-deformation(SPD) procedures like High-Pressure-Torsion(HPT), dramatically increases the strength of the material. This study demonstrates how the mechanical-properties of HPT-tested FeMnNi(low-SFE FCC alloy) varies at various radial-displacements from the center. The alloy exhibits noticeably higher toughness than its high-entropy analogues like Cantor-alloy. Microstructure-entropy has been used to describe the gradient in grain-sizes along the radial direction of these specimens to predict the mechanical-properties, which have also been corroborated by indentation experiments. At various strains, the dislocation-density is calculated by FEM simulations, and subsequently verified by studying the diffraction-patterns. As a result, the model can be used to foretell the strengthening response in similar systems while under quasi-hydrostatic loading conditions. |