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Metastable phases formed in Fe–Cu–Si multilayered films by ion irradiation

Published online by Cambridge University Press:  29 June 2016

B. X. Liu ,
C. H. Shang  and
C. H. Liu
B. X. Liu
Affiliation:
Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
C. H. Shang
Affiliation:
Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
C. H. Liu
Affiliation:
Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Abstract

Iron-rich Fe–Cu–Si multilayers were made by alternately depositing pure elements in a high vacuum system. The as-deposited films were then subjected to 200 keV xenon ion irradiation to doses ranging from 2 × 1015 to 1.2 × 1016 Xe/cm2 at liquid nitrogen and room temperature. Transmission or scanning electron microscope and in situ energy dispersive spectroscopy were used to characterize the films. It was found that ion irradiation induced the formation of a new metastable phase in many irradiated films. The new phase was identified to be of fee structure with a lattice constant a = 0.423 nm. Strikingly, another phase reflecting sharp diffraction spots with 12-fold symmetry was also observed in a room temperature irradiated sample at a dose of 9 × 1015 Xe/cm2. The distribution of the diffraction spots was shown to be incommensurate and bore a close relationship with the metastable fee phase. Furthermore, scanning electron microscope examination revealed that many clusters with 5-fold symmetry emerged in the corresponding film. The sharp incommensurate diffraction patterns may be ascribed to some incommensurate or quasicrystalline order appearing in the ion-induced structures.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 1 , January 1992 , pp. 85 - 88
Copyright
Copyright © Materials Research Society 1992

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References

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