Oxidation kinetics of the quasicrystalline i-AlCuFe phase compared with that of crystalline ω-AlCuFe and pure aluminum

Rouxel, Didier; Gil-Gavatz, Maud; Pigeat, P.; Wéber, B.

doi:10.1016/j.jnoncrysol.2005.02.013

Cited by 21 publications

(10 citation statements)

References 29 publications

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“…On the leached crystal there were places where pentagonal and pentagonal--dodecahedral cavities were found on macroscopic surface orientations that were no longer well-aligned to the original vefold surface. Similar results have previously been observed during oxidation studies on the AlPdMn family quasicrystals where agressive treatments unearthed other internal surface orientations [7,8]. This indicated a preference for the leaching of the vefold direction.…”

Section: Introductionsupporting

confidence: 87%

Leaching Effect on Multiple Surfaces of a Single Grain Decagonal Al-Ni-Co Quasicrystal

Lowe

Gille²,

McGrath³

et al. 2014

Acta Phys. Pol. A

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We have studied the eect of leaching treatments on the surface microstructure and chemical composition on the two dierent twofold surfaces, (10000) and (10100), and the tenfold surface (00001) of a decagonal (d-) AlNiCo quasicrystal. A sample exposing the three surfaces was leached with NaOH solution and then studied using atomic force microscopy and scanning electron microscopy combined with energy dispersive X-ray analysis. The leaching treatment preferentially removes the Al present in the crystal surface leaving a mixture of transition metal and their associated oxides. The high symmetry, tenfold axis was found to be less resistant to leaching than either of the twofold axes, providing further information regarding the eect of crystallographic direction on leaching kinetic.

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Section: Introductionsupporting

confidence: 87%

Leaching Effect on Multiple Surfaces of a Single Grain Decagonal Al-Ni-Co Quasicrystal

Lowe

Gille²,

McGrath³

et al. 2014

Acta Phys. Pol. A

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“…The physicochemical properties of aluminium and silicon are very similar and these elements are more oxidizable than iron. For iron alloys based on aluminium, the aluminium may be the only element to be oxidized [1,2], and it may diffuse towards the surface during the oxidation process. In the present case, it takes part in the phenomenon of internal oxidation.…”

Section: 213aluminiummentioning

confidence: 99%

“…Surface oxidation of metallic alloys is a difficult topic from an academic and industrial point of view, even for steels which have been known for much longer than more recent alloys [1][2][3][4]. In previous studies have shown that the exposure of diluted ironbased alloys to high temperatures in air, for instance, leads to the formation of complex oxide scalings [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Surface composition modification of high-carbon low-alloy steels oxidized at high temperature in air

Genève

Rouxel

Pigeat

et al. 2008

Applied Surface Science

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“…1 Their atomic structure is associated with interesting surface properties 2,3 such as enhanced oxidation resistance 4 and low friction. 5 In recent years, much attention has been paid to the possibility that films might be grown pseudomorphically on quasicrystal surfaces, thereby yielding surfaces that derive the benefits of the quasiperiodic structure, but with a wider range of chemical composition than is accessible in bulk samples.…”

Section: Introductionmentioning

confidence: 99%

Nucleation and growth of Ag islands on fivefold Al-Pd-Mn quasicrystal surfaces: Dependence of island density on temperature and flux

et al. 2007

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Scanning tunneling microscopy (STM) has been used to investigate the nucleation and growth of Ag islands on the fivefold surface of an icosahedral Al-Pd-Mn quasicrystal. Analysis of the data as a function of deposition temperature, from 127 K to 300 K, reveals that island density is constant, while at higher temperature it decreases. To model this behavior, we first show that the potential energy surface describing bonding of Ag at various locations on the surface is complex, with a few sites acting as traps for clusters of adatoms. We then develop a rate equation model which incorporates enhanced nucleation at trap sites relative to nucleation at regular sites on terraces. It recovers the temperature dependence of the island density, plus previous flux-scaling data. Our model suggests that the critical size for both types of nucleation sites is large-corresponding to stable clusters of at least 6 Ag atoms-and that binding between atoms at trap sites is significantly stronger than at free terrace sites. The data and the model, combined, provide guidance about the conditions of temperature and flux under which saturation of trap sites can be expected. This, in turn, provides a general indicator of the conditions that may favor localized pseudomorphic growth at low coverage, here and in other systems. Scanning tunneling microscopy ͑STM͒ has been used to investigate the nucleation and growth of Ag islands on the fivefold surface of an icosahedral Al-Pd-Mn quasicrystal. Analysis of the data as a function of deposition temperature, from 127 K to 300 K, reveals that island density is constant, while at higher temperature it decreases. To model this behavior, we first show that the potential energy surface describing bonding of Ag at various locations on the surface is complex, with a few sites acting as traps for clusters of adatoms. We then develop a rate equation model which incorporates enhanced nucleation at trap sites relative to nucleation at regular sites on terraces. It recovers the temperature dependence of the island density, plus previous fluxscaling data. Our model suggests that the critical size for both types of nucleation sites is large-corresponding to stable clusters of at least 6 Ag atoms-and that binding between atoms at trap sites is significantly stronger than at free terrace sites. The data and the model, combined, provide guidance about the conditions of temperature and flux under which saturation of trap sites can be expected. This, in turn, provides a general indicator of the conditions that may favor localized pseudomorphic growth at low coverage, here and in other systems.

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Oxidation kinetics of the quasicrystalline i-AlCuFe phase compared with that of crystalline ω-AlCuFe and pure aluminum

Cited by 21 publications

References 29 publications

Leaching Effect on Multiple Surfaces of a Single Grain Decagonal Al-Ni-Co Quasicrystal

Leaching Effect on Multiple Surfaces of a Single Grain Decagonal Al-Ni-Co Quasicrystal

Surface composition modification of high-carbon low-alloy steels oxidized at high temperature in air

Nucleation and growth of Ag islands on fivefold Al-Pd-Mn quasicrystal surfaces: Dependence of island density on temperature and flux

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