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Advances in Materials Science and Engineering
Volume 2013, Article ID 163537, 7 pages
http://dx.doi.org/10.1155/2013/163537
Research Article

Microstructural Investigations of Rapidly Solidified Al-Co-Y Alloys

1Department of Metallurgical Engineering, Bulent Ecevit University, Incivez, 67100 Zonguldak, Turkey
2Department of Physics, Faculty of Arts and Sciences, Kahramanmaras Sutcu Imam University, 46100 Kahramanmaras, Turkey
3Department of Materials Science and Engineering, Gebze Institute of Technology, Gebze, 41400 Kocaeli, Turkey

Received 4 May 2013; Revised 2 August 2013; Accepted 16 August 2013

Academic Editor: Amit Bandyopadhyay

Copyright © 2013 B. Avar et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The alloys with different compositions in the Al-rich corner of the Al-Co-Y ternary system were prepared by conventional casting and further processed by melt-spinning technique. The microstructure and the thermal behavior of the alloys were analyzed by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and differential thermal analysis (DTA). It was found that only rapidly solidified Al85Co7Y8 alloy exhibited the best glass forming ability (GFA) and a fully amorphous structure. Besides, Al85Co13Y2 and Al85Co2Y13 alloy ribbons were fully crystalline, whereas Al85Co10Y5 and Al85Co5Y10 alloy ribbons consisted of some crystalline phases within an amorphous matrix. The SEM results showed the same trend that the crystalline phase fraction decreases with the approaching into best glass former. From DSC results, only Al85Co7Y8 amorphous alloy exhibited a glass transition temperature ( ) at 569 K, and its supercooled liquid region ( ) was found to be 17 K. Moreover, other calculated GFA parameters for this alloy system were also discussed.