Eutectic-to-metallic glass transition in the Al-Sm system

TitleEutectic-to-metallic glass transition in the Al-Sm system
Publication TypeJournal Article
Year of Publication2011
AuthorsWang N, Kalay YE, Trivedi R
Journal TitleActa Materialia
Volume59
Pages6604-6619
Date Published10
Type of ArticleArticle
ISBN Number1359-6454
Accession NumberWOS:000295446000011
Keywords3 dimensions, ag-cu alloys, aluminum, Dendritic, DISORDER, eutectic solidification, glass transition, growth, liquid, metallic glass, microstructure selection map, Non-equilibrium, rapid solidification conditions, solidification, solute redistribution, stability, surface energies
Abstract

A systematic experimental study is carried out to investigate microstructure selection over a very wide range of undercooling at the interface in the Al-Sm system by using a combination of the Bridgman, laser and melt spinning techniques, which give increasing interface undercooling. Eutectic microstructure forms at low undercooling, while metallic glass forms at very large undercooling. Experiments are designed to obtain a sharp transition from the eutectic to glass during the growth of eutectic as the interface undercooling increases with growth. The eutectic spacing at the transition is characterized, and the results are analyzed by using a model of eutectic growth that incorporates non-equilibrium effects at the interface. It is shown that a very large undercooling at the interface, required for glass formation, is obtained due to the combined effects of the sharp decrease in the diffusion coefficient, or the sharp increase in viscosity of the liquid, with undercooling in this system and the large undercooling required for the attachment kinetics at the compound liquid interface in the eutectic structure. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

DOI10.1016/j.actamat.2011.07.015
Alternate JournalActa Mater.