Those Properties of CMAs We Know Something About

Fournée, V.; Barthés-Labrousse, Marie Geneviève; Dubois, Jean

doi:10.4028/3-908451-49-3.407

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“…Following this pioneer work, most investigations to date have been devoted to the first stages of oxidation of Alrich complex metallic alloys. Similar to more conventional intermetallics, oxidation of these materials in a vacuum environment leads to Al segregation and the formation of a passivating aluminium oxide layer, a few nm thick (for a review, see [6,7] and the references therein). In most cases, the oxide layer has been found to be amorphous.…”

Section: Introductionmentioning

confidence: 99%

Growth and structure of ultrathin alumina films on the (1 1 0) surface ofγ-Al₄Cu₉complex metallic alloy

Wardé¹,

Ledieu²,

Loli³

et al. 2014

J. Phys.: Condens. Matter

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The first stages of oxidation of the (1 1 0) surface of a γ-Al(4)Cu(9) complex metallic alloy were investigated by combining x-ray photoemission spectroscopy, low energy electron diffraction and scanning tunnel microscopy studies. Oxidation at room temperature in the 2 × 10(-8) to 2 × 10(-7) mbar oxygen pressure range occurs in two steps: a fast regime is followed by a much slower one, leading to the formation of a thin aluminium oxide film showing no long range order. Cu-O bonds are never observed, due to fast oxygen induced aluminium segregation. The low value of the estimated activation energy for aluminium diffusion (0.65 ± 0.12 eV at(-1)) was ascribed to the presence of two vacancies in the γ-Al(4)Cu(9) structure. Annealing at 925 K the oxide film formed at room temperature leads to the formation of small crystallized domains with a sixton structure similar to structures reported in the literature following the oxidation of Cu-9% Al(1 1 1), NiAl (1 1 0) and FeAl(1 1 0) surfaces as well as ultrathin Al films deposited onto Cu(1 1 1) or Ni(1 1 1) surfaces. Two contributions were observed in the O1s peaks, which have been ascribed to loosely bound oxygen species and oxygen belonging to the sixton structure respectively.

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Section: Introductionmentioning

confidence: 99%

Growth and structure of ultrathin alumina films on the (1 1 0) surface ofγ-Al₄Cu₉complex metallic alloy

Wardé¹,

Ledieu²,

Loli³

et al. 2014

J. Phys.: Condens. Matter

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Those Properties of CMAs We Know Something About

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Growth and structure of ultrathin alumina films on the (1 1 0) surface ofγ-Al₄Cu₉complex metallic alloy

Growth and structure of ultrathin alumina films on the (1 1 0) surface ofγ-Al₄Cu₉complex metallic alloy

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Those Properties of CMAs We Know Something About

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Growth and structure of ultrathin alumina films on the (1 1 0) surface ofγ-Al4Cu9complex metallic alloy

Growth and structure of ultrathin alumina films on the (1 1 0) surface ofγ-Al4Cu9complex metallic alloy

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Growth and structure of ultrathin alumina films on the (1 1 0) surface ofγ-Al₄Cu₉complex metallic alloy

Growth and structure of ultrathin alumina films on the (1 1 0) surface ofγ-Al₄Cu₉complex metallic alloy