DataSet / HEAF-NiAl: Ultrafast formation of single B2 phase AlCoCrFeNi high entropy alloy films by combustion of a reactive Ni/Al multilayer as heat source

This are the main raw data and derived data for the publication "Ultrafast formation of single B2 phase AlCoCrFeNi high entropy alloy films by combustion of a reactive Ni/Al multilayer as heat source", Materials & Design 206 (2021) 109790  https://doi.org/10.1016/j.matdes.2021.109790 .

Abstract

High entropy alloy films of AlCoCrFeNi B2-ordered structure are formed during an ultrafast heating process by reactive Ni/Al multilayers. The self-propagating high-temperature reaction occurring in reactive Ni/Al multilayers after ignition represents an ultrafast heat source which is used for the transformation of a thin films Al/CoFe/CrNi multilayer structure into a single phase high entropy alloy film. The materials design of the combined multilayers thus determines the phase formation.

Conventional rapid thermal annealing transforms the multilayer into a film with multiple equilibrium phases. Ultrafast combustion synthesis produces films with ultrafine-grained single-phase B2-ordered compound alloy. The heating rates during the combustion synthesis are in the order of one million K/s, much higher than those of the rapid thermal annealing, which is in the order of about 7 K/s. The results are compared with differential scanning calorimetry experiments with heating rates ranging from about 100 K/s up to 25000 K/s. It is shown that the heating rate clearly determines the phase formation in the multilayers. The rapid kinetics of the combustion prevents long-range diffusion and promotes the run-away transformation. Thus, multilayer combustion synthesis using reactive Ni/Al multilayer as heat source represents a new pathway for the fabrication of single phase high-entropy alloy films.