Accession Number:

ADA190093

Title:

Evolution of Grain Structure in Nickel Oxide Scales,

Descriptive Note:

Corporate Author:

ATOMIC ENERGY RESEARCH ESTABLISHMENT HARWELL (ENGLAND)

Personal Author(s):

Report Date:

1986-11-01

Pagination or Media Count:

55.0

Abstract:

Grain structures and grain growth in oxide scales forming on metals during oxidation determine the extent of grain boundary diffusion. In systems such as the oxidation of nickel to form Nickel oxideNiO, where grain boundary diffusion can control the rate of oxidation, understanding of the factors governing the grain structure is of importance. The aim of this research was to extend understanding of the evolution of grain structure in NiO scales growing on high purity, mechanically polished, polycrystalline nickel. Microstructures of scales grown at 700 C, 800 C and 1000 C for times between 14 hour and 20 hour 1 atm. O2 were examined by Parallel and Transverse Cross Section Transition Electron Microscopy and Scanning Electron Microscopy. Texture coefficients were found by X ray Diffraction.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE