Influence of valence electron concentration over the friction behaviors of quasicrystal and B2-type approximants in Al–Cu–Fe ternary system

Author： Zhang L-M.

Publisher： Springer Publishing Company

ISSN： 1023-8883

Source： Tribology Letters, Vol.8, Iss.4, 2000-01, pp. : 233-236

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Abstract

Quasicrystals and their approximants are Hume–Rothery compounds having similar valence electron concentration. According to the valence electron concentration criterion for approximants, some B2 superstructures can be regarded as a special group of approximants. The present paper reports on an investigation of dry friction behavior of this group of phases. The results are compared with the data from quasicrystalline and related crystalline phases with similar composition. Specifically, we show that samples containing the B2 structure and its superstructures exhibit friction coefficients that decrease with increasing e/a and reach a minimum at 1.86, the value of the quasicrystal. Therefore, quasicrystals and B2-based approximants belong to one group of phases whose surface properties are mainly determined by electronic structure characteristics rather than crystal structures.