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Original Articles

Structural transformations in quasicrystal-forming quenched alloys of Al61Cu26Fe13 subjected to isothermal annealing

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Pages 2913-2919 | Received 17 Aug 2006, Accepted 17 Feb 2007, Published online: 02 Dec 2010
 

Abstract

Conventional transmission electron microscopy (TEM) was employed to investigate structural transformations on annealing of rapidly solidified Al61Cu26Fe13 alloys. In these alloys, β(CsCl)- and ι-phases reveal close to basic orientation relationships ( ‖ A5,  ‖ A2. The β-phase is characterized by short-range order with τ3-type and ω-like displacements. On annealing at 450°C, a solid-state transformation of the β-phase (which has a copper concentration of 40–50 at.%) takes place by homogeneous precipitation of cuboid particles of a phase with triple the unit cell parameter 3aβ. This phase is regarded as close to β-based phases and the vacancy-ordered τ-phases. On annealing at 550°C, a single phase ι-structure is formed.

Acknowledgements

The authors thank Dr A.N. Yksysnikov for technical assistance and Mrs. N.G. Pomortseva for the help in preparing English version of manuscript. The TEM study was carried out in the Electron Microscopy Centre at the Ural Division of Russian Academy of Sciences. This work was supported by the 05-03-32186 RFBR grant.

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