Strengthening of High Entropy Alloys by Dilute Solute Additions: CoCrFeNiAl x and CoCrFeNiMnAl x Alloys

Céline Varvenne (1) , William Curtin (2)

1 CINaM - Centre Interdisciplinaire de Nanoscience de Marseille
2 EPFL - Ecole Polytechnique Fédérale de Lausanne

A theory to predict the initial flow stress of an arbitrary N-component fcc random alloy is extended to predict the additional strengthening when a dilute concentration of a substitutional element is introduced. Assuming properties for the $N$-component alloy to be established, the theory requires only information on the elastic and lattice constants of the new N+1-alloy, and makes a parameter-free prediction for the strength-increment due to the added (N+1)st element. The theory is applied to the CoCrFeNiAlx and CoCrFeNiMnAlx systems, achieving good agreement with experiments. The theory thus serves as a valuable tool for guiding design of new fcc random alloys.

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Mécanique des matériaux [physics.class-ph]

Céline Varvenne, William Curtin. Strengthening of High Entropy Alloys by Dilute Solute Additions: CoCrFeNiAl x and CoCrFeNiMnAl x Alloys. Scripta Materialia, 2017, 138, pp.92-95. ⟨10.1016/j.scriptamat.2017.05.035⟩. ⟨hal-01779093⟩