Precipitation and Hardness of Carbonitrides in a CrMnFeCoNi High Entropy Alloy

Mathilde Laurent-Brocq (1) , Xavier Sauvage (2) , Alfiia Akhatova (2) , Loic Perriere (1) , Eric Leroy (1) , Yannick Champion (1)

1 ICMPE - Institut de Chimie et des Matériaux Paris-Est
2 GPM - Groupe de physique des matériaux

In order to explore precipitation hardening, carbonitrides precipitates are formed within a CrMnFeCoNi high entropy alloy (HEA). The matrix and the precipitates are independently characterized by electron probe microanalysis, atom probe tomography, transmission electron microscopy, and nanoindentation. The matrix is a face-centered cubic multi-component non-equimolar solid-solution, that is, Cr depleted, which is stable and interestingly as hard as its equimolar counterpart. The precipitates are stable chromium carbonitrides with a micron-scale platelets morphology. They exhibit a hexagonal structure, are semi-coherent with the matrixm and are harder than the matrix.

Domaines: Matériaux

Mathilde Laurent-Brocq, Xavier Sauvage, Alfiia Akhatova, Loic Perriere, Eric Leroy, et al.. Precipitation and Hardness of Carbonitrides in a CrMnFeCoNi High Entropy Alloy. Advanced Engineering Materials, 2017, 19 (5), ⟨10.1002/adem.201600715⟩. ⟨hal-01648102⟩