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

Published online by Cambridge University Press:  17 March 2011

Chris Mancinelli ,
Jeff S. Ko ,
Cynthia J. Jenks ,
Patricia A. Thiel ,
Amy R. Ross ,
Thomas A. Lograsso  and
Andrew J. Gellman
Chris Mancinelli
Affiliation:
Department of Chemical Engineering, Carnegie Mellon University Pittsburgh, PA 15213, U.S.A
Jeff S. Ko
Affiliation:
Merck & Co., Inc., West Point, PA 19486
Cynthia J. Jenks
Affiliation:
Department of Chemistry and Ames Laboratory, Iowa State University Ames, IA 50011, U.S.A
Patricia A. Thiel
Affiliation:
Department of Chemistry and Ames Laboratory, Iowa State University Ames, IA 50011, U.S.A
Amy R. Ross
Affiliation:
Department of Chemistry and Ames Laboratory, Iowa State University Ames, IA 50011, U.S.A
Thomas A. Lograsso
Affiliation:
Department of Chemistry and Ames Laboratory, Iowa State University Ames, IA 50011, U.S.A
Andrew J. Gellman
Affiliation:
Department of Chemical Engineering, Carnegie Mellon University Pittsburgh, PA 15213, U.S.A
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Abstract

An experimental comparison has been made between the properties of the surfaces of an Al70Pd21Mn9 quasicrystal and its Al48Pd42Mn10 approximant. The Al70Pd21Mn9 sample was a single grain icosahedral quasicrystal cut to expose its five-fold symmetric (000001) surface. The approximant was polycrystalline β-phase Al48Pd42Mn10, 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 O2 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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 643: Symposium K – Quasicrystals-Preparation, Properties, and Applications , 2000 , K8.2
Copyright
Copyright © Materials Research Society 2001

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