2017-Sustainable Industrial Processing Summit
SIPS 2017 Volume 5. Marquis Intl. Symp. / New and Advanced Materials and Technologies
| Editors: | Kongoli F, Marquis F, Chikhradze N |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2017 |
| Pages: | 590 pages |
| ISBN: | 978-1-987820-69-0 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Competitive Crystallization and Complex Phases in Amorphous Aluminum-rare-earth Alloys
Ralph Napolitano1; Matthew Kramer2; Lin Zhou2;1MATERIALS SCIENCE AND ENGINEERING, IOWA STATE UNIVERSITY, Ames, United States; 2AMES LABORATORY, Ames, United States;
Type of Paper: Regular
Id Paper: 308
Topic: 43
Abstract:
Amorphous alloys of Al-Sm exhibit competitive devitrification behavior upon reheating, involving competition between multiple metastable phases. These include large-unit-cell phases with cubic, hexagonal, and tetragonal symmetry, along with more conventional stable and metastable compounds of the AlxSm variety. Phase selection during crystallization is strongly path dependent, owing to effects of non-crystalline ordering and the role of diffusion and chemical partitioning in the morphological dynamics. In this work, devitrification kinetics are investigated and quantified using high energy X-ray diffraction, thermal analysis, and electron microscopy, including state of the art in situ TEM/STEM. Measurements are related to system thermodynamics in the highly driven regime highlighting principles of selection. Implications with respect to other Al-RE (rare-earth) systems are also discussed. This work was supported by the U.S. Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering. The research was performed at the Ames Laboratory, operated for the U.S. Department of Energy by Iowa State University under Contract No. DE-AC02-07CH11358.