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diffusion coefficients
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in Properties of Pure Metals
> Properties and Selection: Nonferrous Alloys and Special-Purpose Materials
Published: 01 January 1990
Fig. 25 Ratio between diffusion coefficients of alloy elements and self-diffusion of iron. Source: Ref 97
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Published: 01 January 1994
Fig. 4 Ratio of diffusion coefficients of nickel and aluminum as a function of aluminum in NiAl. Source: Ref 31
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Published: 01 August 2013
Fig. 7 Diffusion coefficients ( D ) of interstitial elements (hydrogen, carbon, nitrogen) compared with substitutional elements in alpha iron. Adapted from Ref 10
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Published: 01 January 2003
Fig. 10 Published values of hydrogen diffusion coefficients in duplex stainless steels. Data sources are identified in Ref 22 . Curves 4 and 5 are from the same source. Curves 8 and 9 are from the same source: Ref 22
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Published: 30 November 2018
Fig. 11 Diffusion coefficients (cm 2 /s) for major alloying elements dissolved in solid aluminum
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Published: 01 June 2016
Fig. 8 Plots of diffusion coefficients and temperature (log D versus 1/ T ) for al metals. The straight lines are prominent and commonly found. bcc, body-centered cubic; fcc, face-centered cubic. Source: Ref 7
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Published: 01 June 2016
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Published: 01 August 2013
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Published: 01 October 2014
Fig. 5 Diffusion coefficient of nitrogen in expanded austenite as a function of the nitrogen occupancy of the interstitial sites of the face-centered cubic lattice. Source: Ref 63
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Published: 30 September 2015
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005430
EISBN: 978-1-62708-196-2
..., presenting their diffusion equations. It discusses different methods for evaluating the diffusivity of a material, including the measurement of diffusion coefficients, composition profiles, and layer growth widths. The article reviews the various types of direct and indirect diffusion experiments to extract...
Abstract
Diffusion is the process by which molecules, atoms, ions, point defects, or other particle types migrate from a region of higher concentration to one of lower concentration. This article focuses on the diffusivity data and modeling of lattice diffusion in solid-state materials, presenting their diffusion equations. It discusses different methods for evaluating the diffusivity of a material, including the measurement of diffusion coefficients, composition profiles, and layer growth widths. The article reviews the various types of direct and indirect diffusion experiments to extract tracer, intrinsic, and chemical diffusivities. It provides information on the applications of single-phase and multiphase diffusion.
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in Effect of Irradiation on Stress-Corrosion Cracking and Corrosion in Light Water Reactors
> Corrosion: Environments and Industries
Published: 01 January 2006
Fig. 13 Inverse Kirkendall effects induced by (a) vacancy flux, (b) interstitial flux, and (c) and (d) the effect of diffusion coefficients on the depth distribution for A atoms in an AB alloy. J, C, and D refer to the flux, concentration, and diffusion coefficient, respectively, of diffusing
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Published: 01 January 1993
and M L as constants; curve C, with D L , K e , and M L as constants. The velocity where the tip radius increases is the stability limit. The calculations are made using the conventional stability limit approach, with the addition of a temperature-dependent diffusion coefficient
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Published: 01 December 2009
Fig. 7 Example of the calculation of the intrinsic diffusion and interdiffusion coefficients for the iron-nickel system at 1200 °C. Thermodynamic factors (a) and mobilities (b) for iron and nickel as functions of composition are multiplied to calculate the intrinsic diffusion coefficients
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Published: 01 January 2003
Fig. 15 Schematic illustrating how the presence of a corrosion product deposit influences the corrosion of an underlying metal by limiting both the area of exposed metal and the diffusion of oxidant to the corroding surface. D, diffusion coefficient; ε, porosity; τ, tortuosity factor
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Published: 01 June 2016
). The proportionality constant is the diffusivity or diffusion coefficient. The negative sign is required to make the flux positive to be physically realistic, because the gradient dC / dx is negative. Source: Ref 4
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Published: 01 January 2000
by the diffusion coefficient, D . b = Burgers vector. Source: Ref 5 with data largely from Ref 19
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Published: 01 August 2013
Fig. 10 Estimated single-stage carbon profiles at various carburizing times using a composition-dependent diffusivity coefficient, D (C,T)
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Published: 31 October 2011
Fig. 7 Schematic comparison of the γ → α transformation (time-temperature transformation curve) and the reverse α → γ transformation. Δ G is the driving force, and D is the diffusion coefficient. Adapted from Ref 5
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Published: 01 December 2009
Fig. 4 Example of Boltzmann-Matano calculation for a single-phase interdiffusion t with end-member composition of c i − and c i + . The Matano plane is located at z 0 and is chosen such that the two shaded areas, E and F, are equal. The diffusion coefficient
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