Cooling rate-dependent microstructure and mechanical properties of Al Si0.2CrFeCoNiCu1− high entropy alloys

Microstructure and mechanical properties variation with Ni content in Al0.8CoCr0.6Fe0.7Nix (x = 1.1, 1.5, 1.8, 2.0) eutectic high-entropy alloy system

“…Similar result was found in CrFeNi (3−x) Al x EHEAs [26]. This may be ascribed to the fast solidification and cooling process of as-cast alloys, which were reported significantly influencing on the microstructure of HEAs [31].…”

High entropy alloys obtained by field assisted powder metallurgy route: SPS and microwave heating

“…Hence, an ideal synthetic route to produce HEAs should guarantee short alloying time (achievable, for instance, applying high energy density on the load [28], leading to rapid melting [30] and reduced contamination by the surrounding environment), efficient cooling [31] and capability to operate in controlled atmosphere. Besides the aforementioned synthetic routes, such conditions can be achieved using high frequency electromagnetic fields, like in microwave heating [32], provided that the load is capable to couple with the incident electric and magnetic field.…”

Structural and bonding transformation of Al0.67CrCoCuFeNi high-entropy alloys during quenching

“…Compared with the conventional alloys, the severely distorted lattice in HEAs may make the atoms more difficult to diffuse. Xue reported that the high-cooling HEAs favored the formation of FCC and BCC phase respectively, rather than the dual-phase structure, due to the cooling rate-related sluggish diffusion effect [27]. It should be emphasized that BCC structures appear only as an intermediate state acting on the course of crystallization, which initially increase from 0.3% to 2.0% when the cooling rate decreases from 5 K/ps to 0.34 K/ps, and eventually The bond orientational order parameter is usually used to describe the symmetry of bond orientations regardless of the bond lengths.…”