Metastable microstructures in laser-ablation-deposited Al–Fe thin films

Bysakh, Sandip and Das, Pushpendu Kumar and Chattopadhyay, Kamanio (2001) Metastable microstructures in laser-ablation-deposited Al–Fe thin films. In: Philosophical Magazine A, 81 (11). pp. 2689-2704.

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Abstract

The paper reports studies on the nature of metastable microstructure evolved during pulsed-laser-ablated thin films of Al-Fe alloys with $Al_{72}Fe_{28}$ and $Al_{40}Fe_{60}$ average compositions. The microstructure of these films consists of vapourplasma-quenched matrix and solidified liquid droplets of various sizes embedded in the matrix. For both alloy compositions, vapour quenching yields an amorphous phase. The microstructure of the embedded droplets exhibits size dependence. In $Al_{72}Fe_{28}$ films, a hierarchy of structures from amorphous to metastable nanosized bcc to bcc with ordered y precipitate was observed as a function of increasing size. The formation of ordered y phase is a new observation. The sequence of structure evolution of droplets in $Al_{40}Fe_{60}$ films with increasing size was found to be amorphous to metastable bcc to ordered $B_2$. We argue that disorder trapping occurs during solidification of these droplets.

Item Type:	Journal Article
Publication:	Philosophical Magazine A
Publisher:	Taylor & Francis
Additional Information:	Copyright of this article belongs to Taylor & Francis.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	12 Jun 2006
Last Modified:	04 Jan 2012 12:16
URI:	http://eprints.iisc.ac.in/id/eprint/7592

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