Combinatorial synthesis of high entropy alloys: Introduction of a novel, single phase, body-centered-cubic FeMnCoCrAl solid solution

摘要

We introduce a novel, FeMnCoCrAl high entropy alloy synthesized by combinatorial sputtering and casting. The synthesized thin film library, exhibiting multiple concentration gradients, is characterized using X-ray diffraction, transmission Kikuchi diffraction and atom probe tomography, to elucidate the impact of Al concentration on phase formation. Experimental results and ab-initio calculations show that single phase, body-centered-cubic solid solutions are formed in an Al concentration range extending the equiatomic composition by +/- 6 at.%. This underlines the ability of the FeMnCoCrAl high entropy alloy family to form single phase solid solutions at non-equiatomic compositions and hence with varying configurational entropy contributions. (C) 2016 Elsevier B.V. All rights reserved.