About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Advances in Thermo-Mechanical Processing of Refractory Alloys
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| Presentation Title |
Investigation of Oxidation Resistance and Hot Deformation Behaviour of Refractory Al0.2 Cr0.2Mo0.2Nb0.2Ta0.2 High-Entropy Alloy Synthesized by Adiabatic Aluminothermic Process |
| Author(s) |
Arijit Das, Sanjib Majumdar, Bhaskar Paul, Jugal Kishor Kumhar, Tamanna S R C Murthy, Shubham Kumar |
| On-Site Speaker (Planned) |
Arijit Das |
| Abstract Scope |
A novel quinary Al0.2 Cr0.2Mo0.2Nb0.2Ta0.2 RHEA was prepared by direct co-reduction of oxide precursors. The exothermic and adiabatic aluminothermic reactions produced a homogeneous BCC phase along with Cr-rich Laves phase (Cr₂Ta type), confirmed via X-ray diffraction (XRD), electron microscopy (SEM) and nanoindentation techniques. The energy density for the thermit process was maintained ~2700-3000 J/gm and confirmed using differential thermal analysis (DTA). The optimum alloy yield obtained was ~70%. The alloy was arc consolidated prior to oxidation and hot deformation studies. Isothermal oxidation at 1100°C-10h resulted in specific weight gains of 8.51 mg/cm² in air and exposure at 1000°C-4h caused 5.52 mg/cm² in steam-air environment. Electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) analyses after hot deformation between 1200°C-1400°C revealed deformation twinning, stacking faults, and dynamic recrystallization (DRX). The study demonstrates the viability of thermite-based synthesis for scalable RHEA production and emphasizes the role of high-temperature deformation mechanisms in improving structural performance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Extraction and Processing, Mechanical Properties |