A Vacancy Model of Pore Annihilation During Hot Isostatic Pressing of Single Crystals of Nickel-Base Superalloys

A. Epishin (1) , B. Bokstein (2) , I. Svetlov (3) , B. Fedelich (4) , T. Feldmann (4) , Y. Le Bouar (5) , A. Ruffini (5) , A. Finel (5) , Bernard Viguier (6) , Dominique Poquillon (6)

1 TU - Technical University of Berlin / Technische Universität Berlin
2 MISIS - National University of Science and Technology
3 All-Russian Scientific Research Institute of Aviation Materials
4 BAM Federal Institute for Materials Research and Testing
5 LEM - ONERA - CNRS - Laboratoire d'étude des microstructures [Châtillon]
6 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

An improved diffusion model of pore annihilation during hot isostatic pressing of single crystals of nickel-base superalloys is proposed. The model considers dissolution of pores by emission of vacancies and their diffusion sink to low-angle boundaries. The calculation, which takes into account pore size distribution, predicts the kinetics of pore annihilation similar to experimental one.

Mots clés: Vacancies; Diffusion; Porosity; Hot isostatic pressing (HIP); Single crystals of nickel-base superalloys

Mots clés: POROSITE; BASE NICKEL; MONOCRISTAL

Domaines: Génie des procédés; Matériaux

A. Epishin, B. Bokstein, I. Svetlov, B. Fedelich, T. Feldmann, et al.. A Vacancy Model of Pore Annihilation During Hot Isostatic Pressing of Single Crystals of Nickel-Base Superalloys. Inorganic Materials: Applied Research, 2018, 9 (1), pp.57-65. ⟨10.1134/S2075113318010100⟩. ⟨hal-01735745⟩