Structure and morphology evolution during mechanical alloying of Ti-Al-Si powder systems

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)125-130
Journal / PublicationJournal of Alloys and Compounds
Volume384
Issue number1-2
Publication statusPublished - 14 Dec 2004

Abstract

Ti-Al-Si powders with different Al and Si combinations were mechanically alloyed by ball milling in order to investigate the roles of Al and Si elements in the formation of a Ti supersaturated solid solution or amorphous phase. The results demonstrate that Al plays an active role in promoting the formation of Ti(Al,Si), which can be attributed to the development of a lamellae structure with alternating layers of deformed Ti and Al in the case of Ti-21 Al-4Si (at.%) powder. No such lamellae structure could be formed during the milling of Ti-4Al-21Si (at.%). Though SEM observations indicated fine granular structure after 40h milling in both types of powder mixtures, EDS analyses showed that the fine milled particles were of homogenous composition in the case of Ti-21Al-4Si only. © 2004 Elsevier B.V. All rights reserved.

Research Area(s)

  • Intermetallics, Mechanical alloying, Scanning electron microscopy, X-ray diffraction