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Coherent orientation relationship among various quasicrystalline and crystalline phases in rapidly solidified Al78Mn20Ge2 alloy

Published online by Cambridge University Press:  29 June 2016

N. P. Lalla ,
R. S. Tiwari  and
O. N. Srivastava
N. P. Lalla
Affiliation:
Physics Department, Banaras Hindu University, Varanasi - 221 005, India
R. S. Tiwari
Affiliation:
Physics Department, Banaras Hindu University, Varanasi - 221 005, India
O. N. Srivastava
Affiliation:
Physics Department, Banaras Hindu University, Varanasi - 221 005, India
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Abstract

Rapidly solidified Al78Mn20Ge2 alloy exhibits a curious structural feature; this corresponds to the simultaneous occurrence of almost all the quasicrystalline phases, e.g., primitive and face-centered icosahedral phase, rational approximant, and a new metastable cubic phase. The cubic crystalline phase shows yet another type of recently observed twin relation which effectively produces an icosahedral symmetry, a feature that has so far been specific to alloy systems Al–Mn–Si and Al–Mn–Fe–Si only. The diffraction evidences obtained in the present investigation reveal that the orientation of the structural subunit, which is a MacKay icosahedron, remains invariant across the various interphase boundaries. These results elucidate clearly the structural interrelationship among the various phases.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 1 , January 1992 , pp. 53 - 61
Copyright
Copyright © Materials Research Society 1992

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