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Digitale Medien

18O/SIMS characterization of the growth mechanism of doped and undoped α-Al2O3 (1993)

Pint, B. A. ; Martin, J. R. ; Hobbs, L. W.

Springer

Oxidation of metals 39 (1993), S. 167-195

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ISSN: 1573-4889

Schlagwort(e): α-Al2O3 ; 18O/SIMS ; reactive element effect ; FeCrAl ; β-NiAl

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Abstract Sequential oxidation experiments at 1200°C and 1500°C using16O and 〉95%18O-enriched environments were conducted on undoped and Y- and Zr-doped β-NiAl and FeCrAl alloys. After oxidation, samples were analyzed by SIMS sputter depth profiling. At 1200°C, a clear pattern was established where the undoped α-Al2O3 was found to grow by the simultaneous transport of both Al and O. Zr-doped α-Al2O3 was found to grow mainly by the inward transport of oxygen. The profiles in all cases indicate O diffusion primarily by shortcircuit pathways. Results at 1500°C (only on β-NiAl) indicated a similar behavior but were less conclusive. Y and Zr were found to segregate to the oxide grain boundaries at 1200°C and 1500°C. The segregation of these dopants is believed to impede the cation transport in the α-Al2O3 scale and thereby change the oxidation mechanism.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00665610

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Digitale Medien

The formation of α-Al2O3 scales at 1500°C (1994)

Pint, B. A. ; Hobbs, L. W.

Springer

Oxidation of metals 41 (1994), S. 203-233

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ISSN: 1573-4889

Schlagwort(e): β-NiAl ; α-Al2O3 ; reactive element effect ; ion implantation ; growth mechanism

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Abstract The growth of Al2O3 scales on β-NiAl was studied at 1500°C. Oxidation rates, diffusion mechanisms, and microstructures were examined in order to achieve a complete understanding of the scale development. Variation of the Al content within the β phase field had little effect on the oxidation behavior. Ionimplanted yttrium (2×1016/cm2) was observed to provide a short-term improvement in scale adhesion but little long-term effect. When doped with Y or Zr, the first 1 μm of α-Al2O3 was observed to grow mainly by an inward oxygen growth mechanism. At longer times when the implant was ineffective, microstructural observations indicate a mixed-growth mode.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01080781

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Digitale Medien

The effect of various oxide dispersions on the phase composition and morphology of Al2O3 scales grown on β-NiAl (1997)

Pint, B. A. ; Treska, M. ; Hobbs, L. W.

Springer

Oxidation of metals 47 (1997), S. 1-20

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ISSN: 1573-4889

Schlagwort(e): β-NiAl ; oxide dispersion ; reactive elements ; ϕ-Al2O3 ; phase transformation

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Abstract A series of oxide-dispersedβ-NiAl alloys were oxidized in order to explore the effect of various cation dopants on the ϕ-α phase transformation in the Al2O3 scale and the effect of phase composition on the scale microstructure. Larger ions such as Y, Zr, La, and Hf appeared to slow theϕ- toα-Al2O3 phase transformation, while a smaller ion, Ti, appeared to accelerate the transformation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01682369

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