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Presentation
Comparative Study of the Tribological and Oxidative Properties of AlPdMn Quasicrystals and Their Cubic Approximants
Ames Laboratory Conference Papers, Posters, and Presentations
  • Chris Mancinelli, Carnegie Mellon University
  • Jeff S. Ko, Merck & Co., Inc.
  • Cynthia J. Jenks, Iowa State University
  • Patricia A. Thiel, Iowa State University
  • Amy R. Ross, Iowa State University
  • Thomas A. Lograsso, Iowa State University
  • Andrew J. Gellman, Carnegie Mellon University
Document Type
Conference Proceeding
Conference
MRS Fall Meeting & Exhibit
Publication Date
1-1-2000
DOI
10.1557/PROC-643-K8.2
Geolocation
(42.3584308, -71.0597732)
Abstract

An experimental comparison has been made between the properties of the surfaces of an Al70Pd21Mn9quasicrystal 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.

Comments

This article is from MRS Proceedings 641 (2000): K8.2.1, doi:10.1557/PROC-643-K8.2.

Copyright Owner
Materials Research Society
Language
en
Citation Information
Chris Mancinelli, Jeff S. Ko, Cynthia J. Jenks, Patricia A. Thiel, et al.. "Comparative Study of the Tribological and Oxidative Properties of AlPdMn Quasicrystals and Their Cubic Approximants" Boston, MA(2000)
Available at: http://works.bepress.com/thomas_lograsso/221/