Formation of Icosahedral Quasicrystal and Its 1/1 Crystal Approximant in Al-Pd-Sc System
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- So Yeong-Gi
- Institute of Industrial Science, The University of Tokyo
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- Edagawa Keiichi
- Institute of Industrial Science, The University of Tokyo
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Abstract
An icosahedral quasicrystal (i-phase) and its 1/1 crystal approximant (1/1-phase) have been found to form in Al-Pd-Sc system. The formation areas of the i-phase and the 1/1-phase are limited to very small areas around the compositions of Al54Pd30Sc16 and Al56Pd29Sc15, respectively. The valence electrons per atom ratio (e/a ratio) is calculated to be 2.10 for the i-phase of Al54Pd30Sc16. The 16 at% Sc concentration and e⁄a=2.10, as well as the intensity profile of the measured X-ray diffraction spectrum, indicate that this i-phase can be classified into the Tsai-type: the Tsai-type i-phases found so far commonly contain an element having relatively large atomic size with 15–16 at% and have e/a within the range 2.0–2.15. The formation of the i-phase has also been found in a series of quaternary Al-Pd-Cu-Sc alloys with different compositions keeping 16 at%Sc and e⁄a=2.10. This supports the fact that the two conditions are crucially important in the formation of this type of i-phase.
Journal
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 50 (5), 948-951, 2009
The Japan Institute of Metals and Materials
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Details 詳細情報について
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- CRID
- 1390282679226104448
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- NII Article ID
- 10024814158
- 130004454242
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- NII Book ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- NDL BIB ID
- 10213925
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed