Regarding their attractive mechanical, physical and structural properties, high entropy alloys (HEAs) have gained a great interest. HEAs mainly consist of five or more elements and produce a single-phase, a multi-phase or multi-phase structure with intermetallic compounds depending on the designed alloy. This study presents the investigation of structure, high temperature phase stability, mechanical and magnetic properties of equiatomic FeCoNiAlCu and non-equiatomic Fe-Co-Ni-Al-Cu-(Ti, V, Nb) high entropy alloys using X-ray diffraction (XRD), scanning electron microscope (SEM), optic microscope (OM), hardness and vibrating sample magnetometer (VSM) under both as-cast and isothermally annealed conditions. Thermodynamic calculations were performed to design the alloy compositions. The refractory elements; V, Nb and Ti were selected as additional alloying elements. V, Nb and Ti additions mostly form BCC structure which determines the room temperature and high temperature mechanical properties of the alloys. The analysis indicates that the addition of Nb and V changes the BCC+FCC dual phase structure of FeCoNiAlCu HEA to multi-phase structure. The Nb-alloyed FeCoNiAlCu0.5V0.5 and isothermally annealed Ti-alloyed high entropy alloys show the highest hardness values. The analysis reveals the effect of heat treatment on the hardness, phase stability and magnetic properties of the high entropy alloys. ORCID NO: 0000-0001-8025-7751
Anahtar Kelimeler: High Entropy Alloys, Mechanical Properties, X-Ray Diffraction, Magnetic Properties
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