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Matthews, R.P.; Lang, Candace; Shechtman, D.

doi:10.1023/a:1019185707264

Cited by 13 publications

(3 citation statements)

References 11 publications

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“…Until now, most experimental studies of tribology on quasicrystals [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] have been carried out under conditions in which irreversible ͑plastic͒ deformation takes place during sliding. Frictional energy dissipation measured under such conditions includes contributions from such diverse factors as the breaking of chemical bonds, generation of point defects, interactions with wear debris, phase transformations near the sliding track, and in crystalline materials by creation of dislocations and propagation of slip planes in specific crystallographic directions.…”

Section: Introductionmentioning

confidence: 99%

Tribological properties of quasicrystals: Effect of aperiodic versus periodic surface order

et al. 2006

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We investigated the nanoscale tribological properties of a decagonal quasicrystal using a combination of atomic force microscopy and scanning tunneling microscopy in ultrahigh vacuum. This combination permitted a variety of in situ measurements, including atomic-scale structure, friction and adhesion force, tipsample current, and topography. We found that thiol-passivated tips can be used for reproducible studies of the tip-quasicrystal contact while nonpassivated probes adhere irreversibly to the clean quasicrystalline surface causing permanent modifications. The most remarkable results were obtained on the twofold surface of the Al-Ni-Co decagonal quasicrystal where atoms are arranged periodically along the tenfold axis and aperiodically in the perpendicular direction. Strong friction anisotropy was observed on this surface, with high friction along the periodic direction and low friction in the aperiodic direction. We investigated the nanoscale tribological properties of a decagonal quasicrystal using a combination of atomic force microscopy and scanning tunneling microscopy in ultrahigh vacuum. This combination permitted a variety of in situ measurements, including atomic-scale structure, friction and adhesion force, tip-sample current, and topography. We found that thiol-passivated tips can be used for reproducible studies of the tip-quasicrystal contact while nonpassivated probes adhere irreversibly to the clean quasicrystalline surface causing permanent modifications. The most remarkable results were obtained on the twofold surface of the Al-Ni-Co decagonal quasicrystal where atoms are arranged periodically along the tenfold axis and aperiodically in the perpendicular direction. Strong friction anisotropy was observed on this surface, with high friction along the periodic direction and low friction in the aperiodic direction.

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Section: Introductionmentioning

confidence: 99%

Tribological properties of quasicrystals: Effect of aperiodic versus periodic surface order

et al. 2006

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“…Quasicrystalline Al-Cu-Fe and Al-Cu-Co alloys may be used as structural components in rocket-andspace industry owing to their high hardness, low surface energy, high wear resistance, low friction, and resistance to oxidation [5][6][7][8][9][10][11]. But the quasicrystalline alloys cannot be applied as functional materials due to their brittle nature at ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

Peculiarities in structure formation and corrosion of cast quasicrystalline Al63Cu25Fe12 and Al63Co24Cu13 alloys in sodium chloride aqueous solution

Sukhova

Polonskyy

2020

Phys. Chem. Solid St.

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In this work the structure and corrosion behavior of quasicrystalline cast Al63Cu25Fe12 and Al63Co24Cu13 alloys in 5-% sodium chloride solution (рН 6.9–7.1) were investigated. The alloys were cooled at 5 К/s. The structure of the samples was studied by methods of quantitative metallography, X-ray analysis, and scanning electron microscopy. Corrosion properties were determined by the potentiodynamic method. The made investigations confirm the formation of stable quasicrystalline icosahedral (y) and decagonal (D) phases in the structure of Al63Cu25Fe12 and Al63Co24Cu13 alloys correspondingly. In 5-% sodium chloride solution, the investigated alloys corrode under electrochemical mechanisms with oxygen depolarization. Compared with Al63Cu25Fe12 alloy, Al63Co24Cu13 alloy has a less negative value of free corrosion potential (–0.43 V and–0.66 V, respectively), and its electrochemical passivity region extends due to the inhibition of anodic processes. A corrosion current density, calculated from (E,lgi)-curve, for Al63Co24Cu13 alloy amounts to 0.18 mА/сm2 and for Al63Cu25Fe12 alloy – to 0.20 mА/сm2. The lower corrosion resistance of Al63Cu25Fe12 alloy may be explained by the presence of iron-containing phases in its structure. Based on obtained results, the Al63Co24Cu13 alloy was recommended as a coating material for rocket-and-space equipment working in a marine climate.

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“…Materials with such non-conventional structures exhibit high hardness and stiffness with low fracture toughness and low electrical and thermal conductivities. Although the brittleness restricts their application as bulk engineering materials, their low friction coefficient combined with high hardness directs them to wear resistant material applications, such as in surface cladding of ordinary alloys [2].…”

Section: Introductionmentioning

confidence: 99%