Document Type

Article

Publication Date

2003

Journal or Book Title

Journal of Materials Research

Volume

18

Issue

6

First Page

1447

Last Page

1456

DOI

10.1557/JMR.2003.0199

Abstract

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 Al48Pd42Mn10. Friction coefficients measured in ultrahigh vacuum between a pair of Al48Pd42Mn10 samples having truly clean surfaces were found to be twice as high as those reported for the Al70Pd21Mn9 quasicrystal. When the surfaces were oxidized by exposure to O2 or H2O, 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.

Comments

This article is from Journal of Materials Research 18, no. 6 (2003): 1447–1456, doi:10.1557/JMR.2003.0199.

Copyright Owner

Materials Research Society

Language

en

File Format

application/pdf

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