Out-diffusion of the noble component during the initial stage of the oxidation of gamma prime-Ni3Al

Journal Article · Thu Oct 01 00:00:00 EDT 1992 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(92)90336-D· OSTI ID:6906977

Bobeth, M; Pompe, W; Schumann, E; Ruehle, M ^[1]

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1. Max-Planck-Gruppe Mechanik heterogener Festkoerper, Dresden (Germany) Max-Planck-Institut fuer Metallforschung, Stuttgart (Germany)

Scanning and transmission electron microscopy studies of the oxidation behavior of single crystalline gamma prime-Ni3Al revealed that Ni diffuses through the oxide layer to the surface of the material during oxidation at low oxygen partial pressure. Small pure nickel particles (diameter 50 nm) form on top of the oxide scale. This observation is explained on the basis of a micromechanical model. The model assumes that at intermediate temperatures the prevailing transport mechanism is the diffusion along the oxide/metal interface caused by compressive stresses generated during oxide growth. Relaxation of internal stresses as well as the formation of the small Ni-particles on top of the oxide surface are controlled by interface diffusivity. Other possible stress relief mechanisms can be excluded by theoretical estimates. 18 refs.

• OSTI ID: 6906977
• Journal Information: Acta Metallurgica et Materialia; (United States), Vol. 40:10; ISSN 0956-7151
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
OXIDATION
NICKEL ALLOYS
DIFFUSION
FCC LATTICES
INTERMETALLIC COMPOUNDS
MONOCRYSTALS
SCANNING ELECTRON MICROSCOPY
STRESS ANALYSIS
ALLOYS
CHEMICAL REACTIONS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CUBIC LATTICES
ELECTRON MICROSCOPY
MICROSCOPY
360105* - Metals & Alloys- Corrosion & Erosion