Development of AlxFeNiCoCrCuy high entropy alloys produced by SHS (self-propagating high-temperature synthesis) method

Since high entropy alloys exhibit more advanced properties than conventional alloys, their usage rates in industry have increased in recent years. However, industrial application of alloys produced using high purity elemental raw materials under laboratory conditions creates economic problems. Therefore, in the scope of this study, AlxFeNiCoCrCuy (x = 0.5, 1.0, 1.5, 2.0, 3.0, ; y = 0.5, 1.0) high entropy alloys were produced cost-effectively by reducing oxide powders using the self-propagating high temperature synthesis (SHS) method. The effects of changing Al and Cu ratios on the microstructure of the alloy, the phases formed and the mechanical properties of the alloys were examined by XRF analysis, scanning electron microscopy, X-ray diffraction and microhardness analysis, respectively. It has been determined that with increasing Al ratio, FCC structure is replaced by BCC structure, resulting in an increase in hardness values of alloys. In addition, the changes in the structure with annealing and rolling processes applied to Al0.5FeNiCoCrCu0.5 and Al1.0FeNiCoCrCu0.5 alloys with high formability after vacuum arc melting and casting processes were analyzed.