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Orthorhombic approximant phases and their relation to quasicrystals in mechanically alloyed Al-Cu-Fe-Si alloys
- Authors
- Kim, S. H.; Chattopadhyay, K.; Kim, K. B.; Kim, W. T.; Kim, D. H.
- Issue Date
- Jul-2006
- Publisher
- TAYLOR & FRANCIS LTD
- Citation
- PHILOSOPHICAL MAGAZINE LETTERS, v.86, no.7, pp 425 - 433
- Pages
- 9
- Journal Title
- PHILOSOPHICAL MAGAZINE LETTERS
- Volume
- 86
- Number
- 7
- Start Page
- 425
- End Page
- 433
- ISSN
- 0950-0839
1362-3036
- Abstract
- The possibility of synthesis of quasicrystalline and associated approximant phases during mechanical alloying and subsequent heat treatment of Al65Cu20Fe10Si5 alloy powders has been investigated. It is shown that, in addition to the stable ordered quasicrystal and 1/1 cubic approximant, two more phases having orthorhombic symmetry coexist. The a and c parameters of both these phases are similar to the lattice parameters of the cubic approximant, whereas their b parameters are, respectively, three and four times larger than the c parameters. It is suggested that these phases evolve on account of local symmetry breaking of the cubic approximant phase, possibly due to ordering.
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