Structural relaxation of the melt-spun icosahedral phase and a new type of approximant in Al‒Cu‒Ru alloys
作者:
K. Araki,
A. Waseda,
K. Kimura,
H. Ino,
期刊:
Philosophical Magazine Letters
(Taylor Available online 1993)
卷期:
Volume 67,
issue 5
页码: 351-357
ISSN:0950-0839
年代: 1993
DOI:10.1080/09500839308241272
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The formation range and thermal stability of the icosahedral phase produced by melt spinning were investigated in ternary Al‒Cu‒Ru alloys by X-ray diffraction and transmission electron microscopy. The stable face-centred icosahedral (FCI) phase is formed in a wide region where the condition for the valence electron-to-atom ratioe/a≈1·75is satisfied. Shifts of diffraction peaks to larger angles were observed during an annealing study of the melt-spun Al64Cu23Ru13sample. The decrease in the quasilattice constant is considered to result from atomic ordering in the FCI phase. A new type of stable approximant (1/0 cubic type) was found to exist near the composition Al71Cu7Ru22. This structure has been determined to be simple cubic with a lattice constanta= 7·7 Å. The H3U structure is proposed for this approximant.
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