Journal ArticleDOI
A quantitative demonstration of the grain boundary diffusion mechanism for the oxidation of metals
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...read more
Citations
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A first principles study of the mechanical properties of Li–Sn alloys
TL;DR: In this article, Li et al. studied the mechanical properties of Li-nodes based on density functional theory, including elastic constants such as the orientation-averaged bulk, shear and Young's moduli and Poisson's ratios, as well as the anisotropy and brittlenessductility.
Journal ArticleDOI
Ab initio studies of structural, electronic, optical, elastic and thermal properties of silver gallium dichalcogenides (AgGaX2: X = S, Se, Te)
TL;DR: In this article, the structural, electronic, optical, elastic and thermal properties of the silver gallium dichalcogenides (AgGa X 2 : X ǫ = S, Se, Te) were investigated using the accurate full potential linearized augmented plane wave (FP-LAPW) method.
Journal ArticleDOI
Structural, half-metallic and elastic properties of the half-Heusler compounds NiMnM (M = Sb, As and Si) and IrMnAs from first-principles calculations
Yufeng Wu,Bo Wu,Zhenyi Wei,Zeyou Zhou,Chunfeng Zhao,Yuanpeng Xiong,Shushi Tou,Shangjin Yang,Baiyang Zhou,Yanqun Shao +9 more
TL;DR: In this paper, the structural, half-metallic and elastic properties of the half-Heusler compounds NiMnM (MnSb, As and Si) and IrMnAs were investigated using first-principles calculations within the generalized gradient approximation (GGA) based on density function theory.
Journal ArticleDOI
Anisotropic elasticity and thermal conductivities of (α, β, γ)-LiAlSi2O6 from the first-principles calculation
Hongwei Shou,Yonghua Duan +1 more
TL;DR: In this article, the structural properties, elastic constants and moduli, anisotropy in elastic properties and thermal conductivities of (α, β, γ)-LiAlSi2O6 were investigated.
Journal ArticleDOI
An orthorhombic superhard carbon allotrope: Pmma C24
TL;DR: In this article, a novel carbon phase with a purely sp3-bonded network and an orthorhombic unit cell of 24 atoms, called Pmma C24, was established and the structural characteristics, elastic properties, and mechanical and electronic properties of this novel carbon structure at different pressures.
References
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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
A. Atkinson,R. I. Taylor +1 more
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
F. N. Rhines,J. S. Wolf +1 more
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
A. Atkinson,R. I. Taylor +1 more
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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