Partitioning of Solutes at Crystal Defects in Borides After Creep and Annealing in a Polycrystalline Superalloy - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue JOM Journal of the Minerals, Metals and Materials Society Année : 2021

Partitioning of Solutes at Crystal Defects in Borides After Creep and Annealing in a Polycrystalline Superalloy

Résumé

We have investigated the partitioning of solutes at crystal defects in intergranular Cr-rich M2B borides after creep at 850°C/185MPa and annealing at 850°C for approximately 3000 hours in a polycrystalline nickel-based superalloy. Borides were found to coarsen in both cases, with the borides after creep to be the thickest (800-1100nm), compared to borides annealed in the absence of external applied load (400-600nm). Transmission electron microscopy revealed that the coarsened borides have either a tetragonal I4/mcm structure, or an orthorhombic Fddd, with those two structures coexisting in a single particle. The presence of a very high density of planar faults is systematically 2 observed within the coarsened borides. The faults were correlated with chemical fluctuations of B and Cr, revealed by atom probe tomography. In addition, partitioning of Ni and Co was observed at dislocations within the borides after creep providing insights into the deformation of borides.
Fichier principal
Vignette du fichier
Manuscript_HAL.pdf (1.35 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03435740 , version 1 (18-11-2021)

Identifiants

Citer

Lola Lilensten, Aleksander Kostka, Sylvie Lartigue-Korinek, Baptiste Gault, Sammy Tin, et al.. Partitioning of Solutes at Crystal Defects in Borides After Creep and Annealing in a Polycrystalline Superalloy. JOM Journal of the Minerals, Metals and Materials Society, 2021, 73, pp.2293-2302. ⟨10.1007/s11837-021-04736-5⟩. ⟨hal-03435740⟩
30 Consultations
27 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More