LAUSR

Abstract An examination of a compositionally graded Al x CuCrFeNi 2 high entropy alloy (HEA) or complex concentrated alloy (CCA), revealed that marginally increasing Al content from x = 0.8 to x = 1.0 (+ 6 at.%) changes the primary solidification phase from a simple disordered- fcc to a bcc -based ordered-B2 phase. Subsequently, a second solidification product forms, a disordered- bcc in case of x = 0.8 and a disordered- fcc in case of x = 1.0. Solid-state decomposition within these phases results in fcc  + L1 2 and bcc  + B2 products, accompanied by compositional partitioning. These results provide new insights into the influence of Al on the primary solidification product, and have been rationalized using a computational thermodynamic approach.