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The omega phase formation during laser cladding and remelting of quasicrystal forming AlCuFe on pure aluminum

Biswas, K and Mordike, BL and Galun, R and Chattopadhyay, K (2004) The omega phase formation during laser cladding and remelting of quasicrystal forming AlCuFe on pure aluminum. In: Symposium on Quasicrystals 2003 - Preparation, Properties and Applications held at the 2003 MRS Fall Meeting, DEC 01-03, 2003, Boston, MA.

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Abstract

We report the formation omega phase in the remelted layers during laser cladding and remelting of quasicrystal forming Al65Cu23.3Fe11.7 alloy on pure aluminum. The omega phase is absent in the clad layers. In the remelted layer, the phase nucleates at the periphery of the primary icosahedral phase particles. A large number of omega phase particles forms enveloping the icosahedral phase growing into aluminum rich melt, which solidify as alpha-Al solid solution. On the other side it develops an interface with aluminum. A detailed transmission electron microscopic analysis shows that omega phase exhibits orientation relationship with icosahedral phase. The composition analysis performed using energy dispersive x-ray analyzer suggests that this phase has composition higher aluminum than the icosahedral phase. The analysis of the available phase diagram information indicates that the present results represent large departure from equilibrium conditions. A possible scenario of the evolution of the omega phase has been suggested.

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to Materials Research Society.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 08 Mar 2012 07:52
Last Modified: 08 Mar 2012 07:52
URI: http://eprints.iisc.ernet.in/id/eprint/43807

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