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Icosahedral Phase Formation Domain in Al–Cu–Fe System by Mechanical Alloying

Published online by Cambridge University Press:  31 January 2011

P. Barua ,
B. S. Murty ,
B. K. Mathur  and
V. Srinivas
P. Barua
Affiliation:
Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur-721 302, India
B. S. Murty
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur-732 302, India
B. K. Mathur
Affiliation:
Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur-721 302, India
V. Srinivas*
Affiliation:
Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur-721 302, India
*
a)Address all correspondence to this author. e-mail: veeturi@phy.iitkgp.ernet.in
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Abstract

A systematic composition dependence study on icosahedral phase (i-phase) formation in the Al–Cu–Fe system has been carried out. Structural evolution during mechanical alloying and on subsequent heat treatment has been investigated by x-ray diffraction and transmission electron microscopy. The i-phase is observed to evolve from the reaction between the Al2Cu and b phases. The influence of the Cu to Fe ratio (RCuFe), Al to transition metal ratio (RAlTM), and the electron to atom ratio (e/a) on the volume fraction of the i-phase has been studied. The analysis of the present results and those published earlier indicates that quasicrystal-forming ability correlates better with the RAlTM and e/a ratios. The volume fraction of the i-phase is maximum when the RAlTM ˜ 2.3 and e/a ratio ˜ 2.0. Formation of the i-phase in Al65Cu25Fe10 by mechanical alloying is reported for the first time.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 3 , March 2002 , pp. 653 - 659
Copyright
Copyright © Materials Research Society 2002

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