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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Journal ArticleDOI
Recent progress on the characterization of the high-pressure behaviour of AVO4 orthovanadates
Daniel Errandonea,Alka B. Garg +1 more
TL;DR: In this article, a review of high-pressure studies carried out on the phase behavior of different rare-earth orthovanadates compounds is presented, with the aim of contributing to the actual understanding of the high pressure properties of ternary oxides.
Journal ArticleDOI
Ab initio calculation of bulk and defect properties of ductile rare-earth intermetallic compounds
James R. Morris,James R. Morris,Y. Y. Ye,Y. Y. Ye,Yongbin Lee,B. N. Harmon,Karl A. Gschneidner,Karl A. Gschneidner,Alan M. Russell,Alan M. Russell +9 more
TL;DR: In this paper, the authors used ab initio calculations to examine various properties of YAg and YCu, two members of a class of fully ordered stoichiometric intermetallics with the CsCl-type B2 lattice.
Journal ArticleDOI
Computational materials discovery: the case of the W-B system.
TL;DR: The results show that, among these borides, hP6-WB2 exhibits the largest ultra-incompressibility along the c axis, with the highest C33 value (953 GPa, comparable with that of the most incompressible diamond).
Journal ArticleDOI
Structural, mechanical, electronic and magnetic properties of a new series of quaternary Heusler alloys CoFeMnZ (Z=Si, As, Sb): A first-principle study
M.H. Elahmar,Habib Rached,Djamel Rached,Rabah Khenata,Ghulam Murtaza,S. Bin Omran,Waleed K. Ahmed +6 more
TL;DR: The structural, mechanical, electronic and magnetic properties of the series of Heusler alloys CoFeMnZ (Z=Si, As, and Sb) have been investigated theoretically as discussed by the authors.
Journal ArticleDOI
Brittle cleavage of L12 trialuminides
TL;DR: In this paper, three trialuminide alloys, binary Al3Sc, ternary Al-25Zr−6Fe, and quaternary Al−23Ti-6Fe-5V, all having the cubic L12 structure, were investigated.
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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