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Structural and Phase Formation of TiAl Alloys Synthesized by Mechanical Alloying and Heat Treatment

Al-Dabbagh, Jinan B. and Rozman, Mohd Tahar and M., Ishak and Siti Aisyah, Harun (2015) Structural and Phase Formation of TiAl Alloys Synthesized by Mechanical Alloying and Heat Treatment. International Journal Nanoelectronics and Materials, 8. pp. 23-32. ISSN 1985-5761 (print); 2232-1535 (online)

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Abstract

Mechanical alloying (MA) of Ti%Al (molar fraction) powder by using Planetary ball milling equipment, have been sucessfully refine the crystallite size and produced TiAl nano-alloys. The characteristics of the powder samples, including composition, surface morpology and microstructure, were investigated by using X-ray diffraction and field emission scanning electron microscopy (FESEM) coupled with Energy-dispersive X-ray spectrocopy (EDX). Mechanical alloying of elemental Ti and Al powder mixture resulting in the formation of Ti (Al) solid solution which exhibits a formation of TiAl phase after 40 h of milling. Crystallite size refinement by MA shows a great reduction from 70nm, down to minimum of 21nm after 100h of milling. Subsequently heat treatment of powder milled for 80 h exhibits the formation of a mixture of mainly a2-Ti3Al plus y-TiAl phases. On the other hand,100 hmilled powder exhibits the formation of a major y-TiAl with a2-TiAl and a minor reflection of TiAl3 phases. The crystallite size of heat treated powder are varies and exhibits a grain growth after 40h of mechanical alloying process as a result of multiple phases formation.

Item Type: Article
Uncontrolled Keywords: TiAl intermetallics; Mechanical alloying; Nanostructured materials
Subjects: T Technology > TJ Mechanical engineering and machinery
Faculty/Division: Faculty of Industrial Sciences And Technology
Faculty of Mechanical Engineering
Depositing User: Suhara
Date Deposited: 09 Apr 2015 03:18
Last Modified: 23 Jun 2015 07:10
URI: http://umpir.ump.edu.my/id/eprint/8962
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