2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 2: Dubois Intl. Symp. / Complex Metallic Systems
| Editors: | Kongoli F, Kobe S, Calin M, Dong C |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 130 pages |
| ISBN: | 978-1-987820-38-6 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Application of EBSD on Quasicrystal: Growth of Eutectic QC/Mg
An-Pang Tsai1; Ryo Tanaka2; Satoshi Ohhashi2; Masahiko Demura3; Akiji Yamamoto3;1TOHOKU UNIVERSITY, Sendai, Japan; 2TOHOKU UNIOVERSITY, Sendai, Japan; 3NATIONAL INSTITUTE FOR MATERIALS SCIENCE, Tsukuba, Japan;
Type of Paper: Keynote
Id Paper: 130
Topic: 36
Abstract:
We have developed a new analysis system for identifying the orientation of icosahedral quasicrystal (iQc) in a SEM installed with an electron back scattering diffraction (EBSD) instrument. The system has been successful in assigning the orientations of the iQc and a Mg phases in a eutectic structure prepared by a unidirectional solidification process at a different cooling rate in the Mg-Cd-Yb system. A regular rod-like microstructure was observed in wide regions, where inter-rod spacing decreases with increasing solidification rate. Significant contributions of unidirectional solidification on microstructure were confirmed. It is clear that basal plane of Mg and 2-fold symmetry plane of QC reveal the similar lattice spacing. Also, the prismatic plane of Mg and 5-fold symmetry plane of iQC have the similar lattice spacing. According to EBSD result, the growth direction of iQC/Mg eutectic structure is q 2f r_QC // q 1 0 1 ̅ 0 r_Mg and a unique orientation relationships between iQC and Mg have been verified. The similar lattice spacing with planar normal along growth direction is a key factor stabilizing the interface of iQC and Mg. In the unidirectional solidification samples, the eutectic growth of iQC/Mg is analyzed to be a non-facet/non-facet mode.