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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First-principles investigation of electronic, mechanical and thermodynamic properties of L12 ordered Co3(M, W) (M = Al, Ge, Ga) phases
TL;DR: In this paper, Xiamen University MinJiang Chair Professorship and U.S. National Key Basic Research Program of China (973 Program) were used to conduct a joint study with the US National Natural Science Foundation (NSF) and US Office of Naval Research (ONR).
Journal ArticleDOI
First-principles calculations of binary Al compounds: Enthalpies of formation and elastic properties
Jiong Wang,Jiong Wang,Shun Li Shang,Yi Wang,Zhi-Gang Mei,Yongfeng Liang,Yongfeng Liang,Yong Du,Zi Kui Liu +8 more
TL;DR: In this paper, first-principles calculations of energy vs. volume (E-V) and single crystal elastic stiffness constants ( c i j ) have been performed for 50 Al binary compounds in the Al-X (X = Co, Cu, Hf, Mg, Mn, Ni, Sr, V, Ti, Y, and Zr) systems.
Journal ArticleDOI
Structural, mechanical and electronic properties of sodium based fluoroperovskites NaXF3 (X=Mg, Zn) from first-principle calculations
R. Arar,Tarik Ouahrani,Dinesh Varshney,Rabah Khenata,Ghulam Murtaza,Djamel Rached,A. Bouhemadou,Yarub Al-Douri,S. Bin Omran,Ali H. Reshak +9 more
TL;DR: In this paper, the structural stability, mechanical, electronic and thermodynamic properties of the cubic sodium based fluoro-perovskite NaXF3 (X=Mg, Zn) have been studied using density functional theory.
Journal ArticleDOI
New ternary nanolaminated carbide Mo2Ga2C: A first-principles comparison with the MAX phase counterpart Mo2GaC
TL;DR: In this article, the structural, mechanical and bonding properties of newly synthesized ternary carbide Mo2Ga2C were investigated based on density functional theory and plane-wave pseudopotential total energy method.
Journal ArticleDOI
FP-LAPW study of the elastic properties of Al2X (X=Sc,Y,La,Lu)
TL;DR: In this paper, the elastic properties of Al 2 X (X=Sc,Y,La,Lu,Lu) were investigated using the full-potential linear augmented plane wave method (FP-LAPW).
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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