Formation of decagonal and approximant phases in the Al-Ni-Ru system |
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| Authors: | Pranabananda Mandal Tatsuo Hashimoto Kunio Suzuki Kaoru Hosono Yasushi Kamimura Keiichi Edagawa |
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| Affiliation: | 1. Institute of Industrial Science , University of Tokyo , 4-6-1 Komaba, Meguro-ku, Tokyo , 153-8505 , Japan;2. Ames Laboratory , Ames , Iowa , 50011 , USA;3. Institute of Industrial Science , University of Tokyo , 4-6-1 Komaba, Meguro-ku, Tokyo , 153-8505 , Japan |
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| Abstract: | Al-Ni-Ru alloys with a wide composition range have been synthesized and examined by X-ray and electron diffraction experiments. In this system, two types of decagonal (d) phases are formed, namely basic-type and superlattice-type d phases. Annealing experiments have shown that the basic-type d phase is stable at high temperatures and that its single-phase region is located in a small composition range around Al 75 Ni 15 Ru 10 . On the other hand, the superlattice-type d phase is metastable and has been found to form only in the samples before annealing. Besides the d phases, a high-order crystal approximant phase with lattice parameters a = 99.5 Å and b = 84.6 Å has been found. The structural relation between the approximant phase and the d phase is discussed in terms of a phason tensor. |
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