High-entropy alloys have gained significant attention in recent years due to their unique mechanical and structural properties. This study investigates the behavior of the FeNi1.5CrCu0.5 high-entropy alloy across casting, heat treatments (homogenization and precipitation), cold rolling, and annealing processes. The alloy was cast using a vacuum induction furnace and exhibited a dendritic, single-phase FCC structure with a tensile strength of 400 MPa and elongation of 23%. Homogenization was performed at 1080 °C for 12 hours, followed by water quenching. For precipitation, the samples were initially heat-treated at 1080 °C for 12 hours, then the furnace temperature was reduced to 800 °C, and the samples were held at this temperature for 6, 24, and 48 hours before being quenched in water. EBSD analysis of the homogenized and precipitated samples revealed that after 80% thickness reduction by cold rolling, new strain-free grains were formed around coarse shear bands in the precipitated sample. This formation of new grains was attributed to the reduced hardness in the precipitated sample compared to the homogenized one in cold rolling conditions. Microstructural examination of the annealed samples at 900, 950, and 1000 °C indicated that full recrystallization occurred at 1000 °C. The hardness of the precipitated sample after annealing at this temperature was comparable to that of the homogenized sample, while the precipitated sample exhibited better formability. The shear punch test, used for eva‎luating mechanical properties, confirmed the hardness trends resulting from precipitation. This improvement in strength and formability was attributed to the grain refinement resulting from chromium carbide precipitates. This research explores the effects of thermal and mechanical treatments on optimizing the microstructure and mechanical properties of the FeNi1.5CrCu0.5 alloy and provides strategies for enhancing its properties.

محمدرضا طرقي نژاد , مهدي علي زاده

عباس بهرامي , احمد رضائيان , قاسم ديني