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A Quasicrystalline Decagonal Phase in Al-Fe-Ce

Published online by Cambridge University Press:  25 February 2011

L. H. Angers ,
L. D. Marks ,
J. R. Weertman  and
M. E. Fine
L. H. Angers
Affiliation:
Northwestern University, Dept. of Materials Science & Engineering, Evanston Ilinois 60201
L. D. Marks
Affiliation:
Now at Alcoa Technical Center, Bldg. C, Alcoa Center, PA 15069
J. R. Weertman
Affiliation:
Now at Alcoa Technical Center, Bldg. C, Alcoa Center, PA 15069
M. E. Fine
Affiliation:
Now at Alcoa Technical Center, Bldg. C, Alcoa Center, PA 15069
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Abstract

A number of dispersed phases in Al-Fe-Ce alloys, varying structurally and chemically, have been observed by TEM. Of particular interest were rod-like particles which showed five-fold symmetry and irrational spacings. These dispersoids contain linear features, a periodic, columnar structure parallel to the five-fold axis, aperiodic spacings perpendicular to the five-fold axis and were coherent in one direction with the Al matrix. The evidence indicates a two-dimensional Penrose tiling with a columnar structure, possibly a stacking of eclipsed pentagonal units.

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