About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Microstructural Evolution and Mechanical Property Optimization in (FeNi)2Mo0.75W0.25 Alloys via Partial Substitution of Fe-Ni With Co-Cu |
| Author(s) |
Zahidur Rahman, T. John Balk |
| On-Site Speaker (Planned) |
Zahidur Rahman |
| Abstract Scope |
The microstructure and mechanical behavior of a series of high-entropy alloys (HEAs) based on (FeNi)2Mo0.75W0.25, FeCoNi2Mo0.75W0.25, and FeCoNiCuMo0.75W0.25 compositions were systematically investigated. The base (FeNi)2Mo0.75W0.25 alloy exhibits a dual-phase structure comprising a ductile FCC matrix and an ultra-strong µ-phase precipitated along the inter-dendritic regions. Partial substitution of Fe-Ni with Co-Cu introduces significant microstructural changes: Co contributes to solid solution strengthening within the FCC matrix, while Cu promotes a more ductile globular phase. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) were employed to analyze phase morphology, elemental distribution, and crystal structure. Mechanical properties, including hardness and modulus, were characterized using nanoindentation. Notably, the addition of Cu effectively mitigates the brittleness associated with the µ-phase without compromising strength. Comparative analysis among the three alloy systems provides critical insights into the interplay between microstructure and mechanical response, offering guidance for designing microstructure for high-performance HEAs. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Solidification |