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On the new structural phases in Al65Cu20Cr15 quasicrystalline alloy

Published online by Cambridge University Press:  03 March 2011

Varsha Khare ,
N.P. Lalla ,
R.S. Tiwari  and
O.N. Srivastava
Varsha Khare
Affiliation:
Department of Physics, Banaras Hindu University, Varanasi-221005, India
N.P. Lalla
Affiliation:
Department of Physics, Banaras Hindu University, Varanasi-221005, India
R.S. Tiwari
Affiliation:
Department of Physics, Banaras Hindu University, Varanasi-221005, India
O.N. Srivastava
Affiliation:
Department of Physics, Banaras Hindu University, Varanasi-221005, India
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Abstract

The quasicrystalline (qc) alloy Al65Cu20Cr15, unlike its Ru- and Fe-bearing counterparts like Al65Cu20Ru15 and Al65Cu20Fe15, is a metastable phase. This qc alloy has been shown to possess several structural variants and curious structural characteristics. We have investigated the qc alloy Al65Cu20Cr15 with special reference to the possible occurrence of new structural variants. TEM exploration of the as-quenched qc alloy has indeed revealed the existence of several new phases. These are (i) body-centered cubic (bcc) (a = 12.60 Å, disordered) and simple cubic (s.c.) (a = 12.60 Å, ordered), which are the 1/1 approximants of the primitive icosahedral phase (i phase); (ii) a twice order-induced modulated cubic phase (bcc, a = 25.20 Å) which has been shown to correspond to 1/1 approximant of the ordered i phase [i.e., face-centered icosahedral (FCI)]; and (iii) real crystalline bcc (a = 8.90 Å) and face-centered cubic (fcc) (a = 17.98 Å) phases possessing a specific orientation relationship with the icosahedral matrix phase. Tentative structural models showing the interrelationships between the bcc/fcc phases have been outlined.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 8 , August 1995 , pp. 1905 - 1912
Copyright
Copyright © Materials Research Society 1995

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References

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