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Journal ArticleDOI

A quantitative demonstration of the grain boundary diffusion mechanism for the oxidation of metals

A. Atkinson, +2 more
- 01 May 1982 - 
- Vol. 45, Iss: 5, pp 823-833
TLDR
In this article, the authors report measurements of the oxide scale thickness and oxide grain size as a function of time during the oxidation of high-purity nickel in the temperature range 500-800°C.
Abstract
Below 1000°C the oxidation of nickel cannot be controlled by the diffusion of ions through the bulk crystal lattice of the pure oxide, because the measured oxidation rates are several orders of magnitude faster than would be predicted on this basis. Short-circuit diffusion through oxide grain boundaries or dislocations has usually been held responsible, but there has hitherto been no proper quantitative confirmation of this mechanism. We report measurements of the oxide scale thickness and oxide grain size as a function of time during the oxidation of high-purity nickel in the temperature range 500–800°C. All the oxidation experiments were carried out in pure oxygen at a pressure of one atmosphere. The measured parabolic oxidation rate constants have been compared with those calculated from grain boundary diffusion data obtained in our previous work, using a grain boundary diffusion model for the oxidation process. The quantitative agreement between measured and calculated oxidation rates shows c...

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Citations
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Journal ArticleDOI

Structural, elastic, electronic and thermal properties of the cubic perovskite-type BaSnO3

TL;DR: In this article, the structural, elastic, electronic and thermal properties of cubic perovskite-type BaSnO 3 were investigated and the ground-state properties were in agreement with experimental data.
Journal ArticleDOI

Molecular dynamic simulations on the structures and properties of ɛ-CL-20(0 0 1)/F2314 PBX

TL;DR: Molecular dynamical simulations with the COMPASS force field were employed to investigate the influences of temperature (T), the concentration of F(2314) binder (W%), and crystal defects on the mechanical properties, binding energy (E(bind)), and detonation properties of epsilon-CL-20(001)/F( 2314) PBX (polymer bonded explosives).
Journal ArticleDOI

Enhanced ideal strength of thermoelectric half-Heusler TiNiSn by sub-structure engineering

TL;DR: In this article, the authors applied density functional theory to investigate the response along various tensile and shear deformations of TiNiSn and found that the substitution of Ti by Hf and Zr can enhance the ideal shear strength to 12.17 GPa in Hf0.5Zr 0.5NiSn.
Journal ArticleDOI

Influence of vacancies on the mechanical and thermodynamic properties of TM2B3(TM=Ru and Os) borides from first-principles calculations

TL;DR: In this paper, the influence of vacancy on the Vickers hardness, elastic modulus and thermodynamic properties of transition metal borides with layered structure is investigated by means of first-principles approach.
Journal ArticleDOI

Elastic properties and bonding of the AgGaSe2 chalcopyrite

TL;DR: In this paper, fullpotential linearized augmented plane waves (FPLAPW) calculations have been used to determine the equilibrium properties and elastic constants of the chalcopyrite phase of AgGaSe2.
References
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Journal ArticleDOI

On the role of dislocations in bulk diffusion

E.W. Hart
- 01 Oct 1957 - 
Journal ArticleDOI

Beitrag zur Theorie des Anlaufvorgangs

TL;DR: The Mechanismus des Diffusionsvorgangs is still weitgehend unbekannt as discussed by the authors, i.e., the Diffusion of mindestens einem der beiden Bestandteile durch die Anlaufschicht is notwendig.
Journal ArticleDOI

The diffusion of 63Ni along grain boundaries in nickel oxide

TL;DR: The product of the grain boundary diffusion coefficient and width, D′δ, has been measured directly for the diffusion of 63Ni along grain boundaries in high-purity NiO as discussed by the authors.
Journal ArticleDOI

The role of oxide microstructure and growth stresses in the high-temperature scaling of nickel

TL;DR: In this article, the formation of new nickel oxide upon boundaries of columnar grains where nickel diffusing through the oxide crystals, meets oxygen, diffusing along grain boundaries is identified as the primary cause of this stress.
Journal ArticleDOI

The diffusion of Ni in the bulk and along dislocations in NiO single crystals

TL;DR: In this paper, diffusion profiles of 63Ni tracer in single crystals of NiO following anneals at 522°-1000°C have been determined by a radio-frequency sputter-sectioning technique.
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