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) |
CD shopping page
Composition formulas for eutectic liquids issued from cluster-plus-glue-atom model
Yanping Ma1; Dandan Dong2; Chuang Dong2;1HAINAN UNIVERSITY, Haikou, China; 2DALIAN UNIVERSITY OF TECHNOLOGY, Dalian, China;
Type of Paper: Regular
Id Paper: 195
Topic: 36
Abstract:
In spite of the obvious fundamental as well as engineering interests in eutectic alloys, prominent especially for their low-melting points, the structure and composition of eutectic liquids remain open issues. We have developed a so-called cluster-plus-glue-atom model that suits specially for the description of short-range-order structures in quasicrystals, amorphous alloys, and solid solutions. In this model, any structure is dissociated into a 1st-neighbor coordination polyhedral cluster part and a glue atom part that are situated at the 2nd-neighbors and beyond, outside the cluster part. Then the structure can be expressed by a cluster formula in the form of [cluster]gluex, where the cluster is the coordination polyhedron representative of the 1st-neighbor of the structure, and the glue atoms are located in-between the clusters, marking the short-range order feature on and beyond the 2nd-neighbors. In the present work, this model is applied in establishing the local unit model for eutectic liquids, assuming that a eutectic structural unit consists of two stable subunits, each formulated from the relevant eutectic phases. Such a model is well validated in the B-containing eutectics (except those located by the extreme phase diagram ends), within accuracies below 1 at.%. The dual cluster formulas vary extensively and are rarely identical in different systems. Special cluster matching is pointed out, for instance CN12 cuboctahedron - CN9 capped trigonal prism, and CN12 rhombi-dodecahedron - CN10 octahedral antiprism are frequently combined.