Surface oxidation of the Al62Cu25.5Fe12.5icosahedral quasicrystal

Gil-Gavatz, Maud; Rouxel, Didier; Pigeat, P.; Wéber, B.; Dubois, Jean‐Marie

doi:10.1080/01418610008212152

Cited by 33 publications

(25 citation statements)

References 27 publications

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“…This observation corroborates previous findings that quasicrystals exhibit some resistance to surface oxidation. [6][7][8][9][11][12][13][14]38,39 Exposure to oxygen acted to passivate the surfaces and decrease the friction coefficient from s ‫ס‬ 1.22 ±0.85 for the clean surfaces to s ‫ס‬ 0.83 ±0.32 for the surfaces exposed to oxygen alone. Further oxidation through exposure to H 2 O vapor did not cause significant further reduction in the friction.…”

Section: Discussionmentioning

confidence: 99%

“…It is well understood that exposure of clean Al-rich quasicrystals (AlPdMn or AlCuFe) to oxygen results in the selective oxidation of Al to form a thin and passivating Al 2 O 3 layer. [6][7][8][9][11][12][13][14]38,39 This layer acts as a barrier to further oxidation of the bulk. Exposure to H 2 O (vapor or liquid), however, has been shown to increase the oxide layer thickness beyond that reached by oxidation in O 2 .…”

Section: A Oxidationmentioning

confidence: 99%

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Tribological properties of a B2-type Al-Pd-Mn quasicrystal approximant

et al. 2003

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The tribological properties of a B2-type Al-Pd-Mn quasicrystal approximant were investigated and compared with those of an Al-Pd-Mn icosahedral quasicrystal. The approximant was of the _ phase, having a crystalline CsCl-type structure and nominal composition Al 48 Pd 42 Mn 10 . Friction coefficients measured in ultrahigh vacuum between a pair of Al 48 Pd 42 Mn 10 samples having truly clean surfaces were found to be twice as high as those reported for the Al 70 Pd 21 Mn 9 quasicrystal. When the surfaces were oxidized by exposure to O 2 or H 2 O, the friction coefficients decreased by roughly a factor of two for both materials but the friction coefficient for the approximant remained roughly twice that of the quasicrystal. The rate of oxidation of the approximant was found to be one order of magnitude higher than that of the quasicrystal. This corroborates findings that suggest that quasicrystals exhibit an inherent resistance to oxidation and corrosion. Vickers hardness measurements show that the quasicrystal is roughly three times as hard as the approximant. O, the friction coefficients decreased by roughly a factor of two for both materials but the friction coefficient for the approximant remained roughly twice that of the quasicrystal. The rate of oxidation of the approximant was found to be one order of magnitude higher than that of the quasicrystal. This corroborates findings that suggest that quasicrystals exhibit an inherent resistance to oxidation and corrosion. Vickers hardness measurements show that the quasicrystal is roughly three times as hard as the approximant. Keywords Ames Laboratory

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Section: Discussionmentioning

confidence: 99%

Section: A Oxidationmentioning

confidence: 99%

Tribological properties of a B2-type Al-Pd-Mn quasicrystal approximant

et al. 2003

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“…These desirable properties reportedly include low friction, high hardness, high wear and corrosion resistance, and low surface energy [2][3][4][5][6][7][8][9]. Quasicrystals were also found to have low thermal conductivity and moderate electrical conductivity, making them suitable for use in thermoelectric devices [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Formation and stability of icosahedral phase in Al₆₅Ga₅Pd₁₇Mn₁₃alloy

Yadav

Shaz

Tiwari

et al. 2008

Philosophical Magazine

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In this work, we present the formation and characterization of a quaternary (pseudo ternary) icosahedral quasicrystal in Al 65 Ga 5 Pd 17 Mn 13 alloy. The Xray diffraction and transmission electron microscopy confirmed the formation of icosahedral, B2 type and ξ' crystalline (orthorhombic structure with unit cell a = 23.5Å, b= 16.6Å and c = 12.4 Å) phases in as cast alloy.The icosahedral phase gets formed after annealing at 800 °C for 60 hours.The formation of icosahedral phase in Al-Ga-Pd-Mn quaternary alloy by present technique has been studied for the first time. The Energy dispersive X-ray analysis investigations suggest the presence of Ga (~ 5 at %) in the alloy. It is interesting to note that pseudo twelve fold pattern in the as cast alloy has been observed. Icosahedral Al-Ga-Pd-Mn provides a new opportunity to investigate the various characteristics including surface characteristics. Attempts will be made to discuss the micromechanisms for the formation of quasicrystalline phase in Al-Ga-Pd-Mn alloys.

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“…Two such properties that might, in principle, lead to important commercial and technological applications of these materials are their tribological and corrosion properties. There have been a number of reports of apparently low friction measured on the quasicrystal surfaces and there have also been a number of studies of their oxidation behavior [1][2][3][4][5][6][7][8][9][10][11][12][13]. In addition there are other properties of quasicrystals such as high hardness, low thermal conductivity, and interesting electronic properties that might be of practical interest and importance [1,[14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of the Tribological and Oxidative Properties of AlPdMn Quasicrystals and Their Cubic Approximants

Mancinelli

Jenks

et al. 2000

MRS Proc.

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An experimental comparison has been made between the properties of the surfaces of an Al 70 Pd 21 Mn 9 quasicrystal and its Al 48 Pd 42 Mn 10 approximant. The Al 70 Pd 21 Mn 9 sample was a single grain icosahedral quasicrystal cut to expose its five-fold symmetric (000001) surface. The approximant was polycrystalline β-phase Al 48 Pd 42 Mn 10 , which has a CsCl-type cubic structure. Surfaces of both were prepared under ultra-high vacuum (UHV) conditions and then used for comparative measurements of their frictional properties and oxidation rates. Both materials are oxidized by reaction with O 2 to form a thin film of aluminum oxide that ultimately passivates their surfaces. The interesting difference between the two is that the rate of oxidation of the approximant is significantly higher than that of the quasicrystal in spite of the fact that the bulk Al concentration of the approximant is lower than that of the quasicrystal. Friction measurements were made under UHV conditions between pairs of quasicrystals and pairs of approximants whose surfaces were either clean or oxidized to varying degrees. The friction between pairs of the approximant surfaces is significantly higher than that measured between the quasicrystal surfaces under all conditions of surface oxidation. sample was a single grain icosahedral quasicrystal cut to expose its five-fold symmetric (000001) surface. The approximant was polycrystalline β-phase Al 48 Pd 42 Mn 10 , which has a CsCl-type cubic structure. Surfaces of both were prepared under ultra-high vacuum (UHV) conditions and then used for comparative measurements of their frictional properties and oxidation rates. Both materials are oxidized by reaction with O 2 to form a thin film of aluminum oxide that ultimately passivates their surfaces. The interesting difference between the two is that the rate of oxidation of the approximant is significantly higher than that of the quasicrystal in spite of the fact that the bulk Al concentration of the approximant is lower than that of the quasicrystal. Friction measurements were made under UHV conditions between pairs of quasicrystals and pairs of approximants whose surfaces were either clean or oxidized to varying degrees. The friction between pairs of the approximant surfaces is significantly higher than that measured between the quasicrystal surfaces under all conditions of surface oxidation. Keywords

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Surface oxidation of the Al₆₂Cu_25.5Fe_12.5icosahedral quasicrystal

Cited by 33 publications

References 27 publications

Tribological properties of a B2-type Al-Pd-Mn quasicrystal approximant

Tribological properties of a B2-type Al-Pd-Mn quasicrystal approximant

Formation and stability of icosahedral phase in Al₆₅Ga₅Pd₁₇Mn₁₃alloy

Comparative Study of the Tribological and Oxidative Properties of AlPdMn Quasicrystals and Their Cubic Approximants

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Surface oxidation of the Al62Cu25.5Fe12.5icosahedral quasicrystal

Cited by 33 publications

References 27 publications

Tribological properties of a B2-type Al-Pd-Mn quasicrystal approximant

Tribological properties of a B2-type Al-Pd-Mn quasicrystal approximant

Formation and stability of icosahedral phase in Al65Ga5Pd17Mn13alloy

Comparative Study of the Tribological and Oxidative Properties of AlPdMn Quasicrystals and Their Cubic Approximants

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Surface oxidation of the Al₆₂Cu_25.5Fe_12.5icosahedral quasicrystal

Formation and stability of icosahedral phase in Al₆₅Ga₅Pd₁₇Mn₁₃alloy