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Phase Transformations in β- Phase Cuzn Single Crystals Induced By Ion Irradiation

Published online by Cambridge University Press:  02 July 2020

Alfredo J. Tolley  and
Esteban A. Sanchez
Alfredo J. Tolley
Affiliation:
Centro Atómico Bariloche, CNEA; Instituto Balseiro, Universidad Nacional de Cuyo; CONICET. 8400 San Carlos de Bariloche, Rio Negro, Argentina.
Esteban A. Sanchez
Affiliation:
Centro Atómico Bariloche, CNEA; Instituto Balseiro, Universidad Nacional de Cuyo; CONICET. 8400 San Carlos de Bariloche, Rio Negro, Argentina.
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Abstract

The high temperature equilibrium β phase in Cu-based alloys has a disordexed bcc structure. Its stability at high temperatures is due to the large amplitude ﹛0 ζ ζ)﹜ <0 ζ ζ> soft mode which provides a large vibrational entropy. This stability decreases with temperature as the entropy term in the Gibbs free energy becomes smaller. However, by quenching it is possible to retain the β phase avoiding decomposition by diffusion controlled transformations. in ternary β phase Cu-Zn- Al alloys, ion irradiation at room temperature has been reported to induce a phase transformation to a close packed structure or to produce γ phase precipitates. in order to further study the tendency of the β phase to decompose into other phases at room temperature, ion irradiation experiments in binary Cu-Zn single crystals were carried out using a beam of 30 keV Ar ions. The changes in the microstructure were examined using transmission electron microscopy.

Type
Metals and Alloys
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 1254 - 1255
Copyright
Copyright © Microscopy Society of America 2001

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References

References:

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