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Title: Microstructural observations on the oxidation of gamma-prime-Ni3Al at low oxygen partial pressure

Abstract

Electron microscopy is used to investigate microstructural development during the oxidation of the 001-plane-oriented gamma-prime-Ni3Al single crystals at 1223 K under an oxygen partial pressure of 4 x 10 exp -19. After 1-min oxidation, TEM cross sections revealed a continuous 4-nm-thick film of gamma-Al2O3 with equiaxed 20-nm protrusions into the metal. Continued oxidation resulted in thickening of the gamma-Al2O3 scale, no grain growth, and the development of a plane metal/gamma-Al2O3 interface. Depletion of Al from the adjoining metal resulted in a well-defined disordered zone of Ni-Al solid solution between the Al2O3 scale and the gamma-prime-Ni3Al. After 5-h oxidation, large randomly oriented alpha-Al2O3 grains nucleated at the metal/gamma-Al2O3 interface, growing inward and transforming from the gamma-Al2O3 outward. The alpha-Al2O3 contained intragranular and intergranular voids. The gamma-Al2O3 exhibited a high density of planar defects and the interface between the gamma-Al2O3 and alpha-Al2O3 contained many voids. Voids were never observed at the metal/oxide interface. 19 refs.

Authors:
; ; ;  [1]
  1. Max-Planck-Institut fuer Metallforschung, Stuttgart (Germany)
Publication Date:
OSTI Identifier:
7069393
Resource Type:
Journal Article
Journal Name:
Acta Metallurgica et Materialia; (United States)
Additional Journal Information:
Journal Volume: 40:6; Journal ID: ISSN 0956-7151
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; MICROSTRUCTURE; OXIDATION; NICKEL ALLOYS; ELECTRON MICROSCOPY; GRAIN SIZE; INTERMETALLIC COMPOUNDS; MONOCRYSTALS; PARTIAL PRESSURE; SUPERLATTICES; ALLOYS; CHEMICAL REACTIONS; CRYSTAL STRUCTURE; CRYSTALS; MICROSCOPY; SIZE; 360102* - Metals & Alloys- Structure & Phase Studies; 360105 - Metals & Alloys- Corrosion & Erosion

Citation Formats

Schumann, E, Schnotz, G, Trumble, K P, and Ruehle, M. Microstructural observations on the oxidation of gamma-prime-Ni3Al at low oxygen partial pressure. United States: N. p., 1992. Web. doi:10.1016/0956-7151(92)90432-E.
Schumann, E, Schnotz, G, Trumble, K P, & Ruehle, M. Microstructural observations on the oxidation of gamma-prime-Ni3Al at low oxygen partial pressure. United States. https://doi.org/10.1016/0956-7151(92)90432-E
Schumann, E, Schnotz, G, Trumble, K P, and Ruehle, M. 1992. "Microstructural observations on the oxidation of gamma-prime-Ni3Al at low oxygen partial pressure". United States. https://doi.org/10.1016/0956-7151(92)90432-E.
@article{osti_7069393,
title = {Microstructural observations on the oxidation of gamma-prime-Ni3Al at low oxygen partial pressure},
author = {Schumann, E and Schnotz, G and Trumble, K P and Ruehle, M},
abstractNote = {Electron microscopy is used to investigate microstructural development during the oxidation of the 001-plane-oriented gamma-prime-Ni3Al single crystals at 1223 K under an oxygen partial pressure of 4 x 10 exp -19. After 1-min oxidation, TEM cross sections revealed a continuous 4-nm-thick film of gamma-Al2O3 with equiaxed 20-nm protrusions into the metal. Continued oxidation resulted in thickening of the gamma-Al2O3 scale, no grain growth, and the development of a plane metal/gamma-Al2O3 interface. Depletion of Al from the adjoining metal resulted in a well-defined disordered zone of Ni-Al solid solution between the Al2O3 scale and the gamma-prime-Ni3Al. After 5-h oxidation, large randomly oriented alpha-Al2O3 grains nucleated at the metal/gamma-Al2O3 interface, growing inward and transforming from the gamma-Al2O3 outward. The alpha-Al2O3 contained intragranular and intergranular voids. The gamma-Al2O3 exhibited a high density of planar defects and the interface between the gamma-Al2O3 and alpha-Al2O3 contained many voids. Voids were never observed at the metal/oxide interface. 19 refs.},
doi = {10.1016/0956-7151(92)90432-E},
url = {https://www.osti.gov/biblio/7069393}, journal = {Acta Metallurgica et Materialia; (United States)},
issn = {0956-7151},
number = ,
volume = 40:6,
place = {United States},
year = {Mon Jun 01 00:00:00 EDT 1992},
month = {Mon Jun 01 00:00:00 EDT 1992}
}