Traversier, M., Mestre-Rinn, P., Peillon, N., Rigal, E., Boulnat, X., Tancret, F., Dhers, J. & Fraczkiewicz, A. (2021) Nitrogen-induced hardening in an austenitic CrFeMnNi high-entropy alloy (HEA). Materials Science and Engineering: A, 804 140725.
Added by: Richard Baschera (2021-03-15 14:40:53) Last edited by: Richard Baschera (2021-03-15 14:41:59)
|Type de référence: Article
Numéro d'identification (ISBN etc.): 0921-5093
Clé BibTeX: Traversier2021
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Mots-clés: High entropy alloys (HEA), microstructure, Nitrogen alloying, Solid solution, Tensile properties
Créateurs: Boulnat, Dhers, Fraczkiewicz, Mestre-Rinn, Peillon, Rigal, Tancret, Traversier
Collection: Materials Science and Engineering: A
Consultations : 6/84
Indice de consultation : 2%
Indice de popularité : 0.5%
|Liens URLs https://www.scienc ... /S0921509320317883|
Nitrogen is a well-known gamma-stabiliser in austenitic steels, also responsible for significant solid solution hardening of these materials. Yet, only few papers have studied its impact on austenitic high-entropy alloy (HEA) matrixes. This study focuses on a cobalt-free, non equimolar CrFeMnNi HEA doped with nitrogen. A series of alloys was cast under a nitriding atmosphere to promote nitrogen absorption into the liquid alloy. Study of as-cast alloys has shown nitrogen presence in solid solution up to 0.3 wt % (1.2 at. %). Over the whole range of compositions, a linear increase of hardness (134 HV/wt. % of N) was measured as well as an expansion of the lattice parameter of Δa/a = 1.01/wt. % N due to nitrogen addition in the interstitial sites of the lattice. Tests on forged and annealed samples showed that the increase of hardness with nitrogen addition is higher than in as-cast state (210 HV/wt. % of N) surely due to presence of other strengthening mechanisms. Tensile tests confirmed that the presence of dissolved nitrogen increases yield strength and ultimate strength and enhances strain-hardening, without any modification of ductility.