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Investigation of transition from decagonal to vacancy ordered phase on replacement of Co by Cu in Al70Co15– x Cu x Ni15

Authors :
Thakur Prasad Yadav
M.A. Shaz
O.N. Srivastava
R. S. Tiwari
Source :
Zeitschrift für Kristallographie - Crystalline Materials. 218:12-16
Publication Year :
2003
Publisher :
Walter de Gruyter GmbH, 2003.

Abstract

The alloy with composition Al70Co15Ni15 forms one of the important quasicrystalline phase exhibiting formation of decagonal variants [1, 2]. In the present investigation, copper has been substituted in place of cobalt i.e. the phases corresponding to Al70Co15– x Cu x Ni15, have been investigated. It is found that when copper concentration reaches to a value of 10 atomic percent with the composition corresponding to Al70Co5Cu10Ni15, the decagonal phase starts yielding to give rise to vacancy ordered phase. When all cobalt is replaced by copper i.e. when the composition corresponds to Al70Cu15Ni15, the decagonal phase disappears and the only phase observed is the vacancy ordered phase. It can thus be said that copper substitution brings in decagonal to vacancy ordered (VOP) phase transition. It has also been observed that gradual increase in concentration of Cu in Al70Co15– x Cu x Ni15 leads to cellular to dendritic transition in morphology.

Details

ISSN :
21967105 and 21944946
Volume :
218
Database :
OpenAIRE
Journal :
Zeitschrift für Kristallographie - Crystalline Materials
Accession number :
edsair.doi...........427d86a37bf22c8b57cd43d4565cb731
Full Text :
https://doi.org/10.1524/zkri.218.1.12.20774