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On the nature of the quasicrystalline phases obtained in alloys of Al86Mn14 under slow solidification rates

Published online by Cambridge University Press:  31 January 2011

J. Reyes-Gasga ,
J. G. Pérez-Ramírez  and
R. Pérez
J. Reyes-Gasga
Affiliation:
Laboratorio de Ensenada, Instituto de Fisica, UNAM, Apdo. Postal 2681, Ensenada, B.C. 22800 Mexico
J. G. Pérez-Ramírez
Affiliation:
Laboratorio de Ensenada, Instituto de Fisica, UNAM, Apdo. Postal 2681, Ensenada, B.C. 22800 Mexico
R. Pérez
Affiliation:
Laboratorio de Ensenada, Instituto de Fisica, UNAM, Apdo. Postal 2681, Ensenada, B.C. 22800 Mexico
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Abstract

An investigation of the quasicrystalline phases obtained in alloys of Al86Mn14 under slow solidification rates is carried out. A quasicrystalline phase similar to the so-called T phase [L. Bendersky, R. J. Schaefer, F. S. Biancaniello, M. J. Boettinger, M. J. Kaufman, and D. Schechtman, Scr. Metall. 19, 909 (1985)] is found. However, this phase also shows a pseudofivefold axis and a threefold diffraction pattern similar to the same orientation in the reported phase of Al4Mn. The analysis of pseudofivefold diffraction patterns from different quasicrystalline grains shows elliptical arrangements of spots with different eccentricities. The presence of planar faults indicates the existence of slip pseudoplanes and slip directions in the quasicrystal. Different eccentricities might suggest that some of the reported quasicrystalline phases (T, T′, T″, …, etc.) are structural states obtained from the icosahedral quasicrystalline phase when particular stress environments are acting.

Type
Articles
Information
Journal of Materials Research , Volume 3 , Issue 1 , February 1988 , pp. 29 - 33
Copyright
Copyright © Materials Research Society 1988

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References

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