Comment on “Oxidation of alloys containing aluminum and diffusion in Al2O3” [J. Appl. Phys. 95, 3217 (2004)]

Pint, Bruce A.; Deacon, Ryan M.

doi:10.1063/1.1923610

Cited by 9 publications

(5 citation statements)

References 26 publications

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“…(This approach essentially parallels that set forth by Pint et al, albeit with minor alterations) [12,13]. By applying this to a large data set (for x and G versus T, t) in the oxidation of a FeCrAl(Zr) heater alloy (Hoskins 875), it was then found that [10]:…”

Section: Introductionmentioning

confidence: 64%

“…The lower symbol corresponds to a similarly corrected value that accounted for grain size variability across the scale thickness [14]. Finally, data for G = 0.5 lm scales grown on FeCrAl and FeCrAlY after 100 h at 1200°C from Pint are shown as the upper and lower triangles, respectively [12,13]. They indicate a reduced diffusivity of $3Â due to Y-doping.…”

Section: Resultsmentioning

confidence: 99%

“…It is significant that the treatment presented above produced a nearly uniform assessment of data from 13 studies for 13 materials. There are no consistent or dramatic differences between substrates and scales presumably doped with Fe, Cr, Ti, Zr, or Y, with perhaps the largest reduction (3Â) shown by Y-doping [13]. Given that all the validated data falls within tight bands shown in Fig.…”

Section: Tablementioning

confidence: 99%

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Oxygen diffusivity in alumina scales grown on Al-MAX phases

Smialek

2015

Corrosion Science

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a b s t r a c t Ti 3 AlC 2 , Ti 2 AlC, and Cr 2 AlC are oxidation resistant MAX phase compounds distinguished by the formation of protective Al 2 O 3 scales with well controlled kinetics. A modified Wagner treatment was used to calculate interfacial grain boundary diffusivity from scale growth rates and corresponding interfacial grain size, based on the pressure dependence of oxygen vacancies and diffusivity. MAX phase data from the literature yielded grain boundary diffusivity nearly coincident with that for Zr-doped FeCrAl (and many other FeCrAl alloys), suggesting similar oxidation mechanisms. The consolidated body of diffusivity data was consistent with an activation energy of 375 ± 25 kJ/mol.Published by Elsevier Ltd.

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Section: Introductionmentioning

confidence: 64%

Section: Resultsmentioning

confidence: 99%

Section: Tablementioning

confidence: 99%

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Oxygen diffusivity in alumina scales grown on Al-MAX phases

Smialek

2015

Corrosion Science

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“…From an analysis of the temperature dependence of the oxidation rate constant, it was found that the addition of Y 3+ raised the activation energy for oxygen grain‐boundary diffusion from 430±40 to 497±8 kJ/mol. As noted by Pint and Deacon, 53 discrepancies between activation energy values for diffusion and oxidation can arise due to changes in the grain size and crystal structure of the alumina scale at different temperatures. Nonetheless, it is perhaps instructive to compare roughly the measured activation energies for oxidation determined here with those obtained from other groups.…”

Section: Discussionmentioning

confidence: 98%

The Effect of Yttrium on Oxygen Grain‐Boundary Transport in Polycrystalline Alumina Measured Using Ni Marker Particles

Cheng¹,

Dillon²,

Caram³

et al. 2008

Journal of the American Ceramic Society

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The grain‐boundary transport of oxygen in polycrystalline α‐Al2O3 (undoped and 500 ppm Y3+‐doped) was studied in the temperature regime of 1100°–1500°C by monitoring the oxidation of a fine, uniform dispersion of Ni marker particles (0.5 vol%). The annealing treatments were carried out in a high‐purity O2 atmosphere (>99.5%). The Ni particles, which are visibly oxidized to nickel aluminate spinel, were used to determine the depth of oxygen penetration. The thickness of the reaction zone was measured as a function of heat‐treatment time and temperature, and a comparison of the oxidation rate constants and activation energies for undoped and Y3+‐doped alumina was made. The results indicate that the presence of Y3+ slows oxygen grain‐boundary transport in alumina by a variable factor of from 15 to 3 in the temperature regime of 1100°–1500°C. The values of the activation energy for undoped and Y3+‐doped alumina were determined to be 430±40 and 497±8 kJ/mol, respectively.

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“…Doremus accepted the aluminum self-diffusion data of Le Gall et al 21 (data which are problematical-see below) that self-diffusion coefficients of oxygen and aluminum in Al 2 O 3 are of similar magnitude, and proposed that "bulk diffusion of oxygen (and aluminum) takes place by jumps of AlO molecules from one AlO vacancy to another." As applied to oxidation of Al-containing alloys, the theory has been severely criticized by Pint and Deacon, 22 criticism that Doremus did not accept. 23 While there are issues of physical plausibility with Doremus' theory, he can nevertheless be lauded for attempting some new thinking on this topic.…”

Section: Lattice Diffusionmentioning

confidence: 97%