Hostname: page-component-78c5997874-lj6df Total loading time: 0 Render date: 2024-11-20T00:13:48.761Z Has data issue: false hasContentIssue false
  • English
  • Français

Nanoscale compositional changes along fast ion tracks in equilibrium solid solutions: A computer simulation of ultra-fast solidification and thermomigration

Published online by Cambridge University Press:  15 March 2011

Edmundo M. Lopasso ,
Alfredo Caro ,
Eduardo Ogando Arregui  and
Magdalena Caro
Edmundo M. Lopasso
Affiliation:
Centro Atómico Bariloche - Instituto Balseiro, 8400 Bariloche, Argentina
Alfredo Caro
Affiliation:
Centro Atómico Bariloche - Instituto Balseiro, 8400 Bariloche, Argentina
Eduardo Ogando Arregui
Affiliation:
Dep. de Electricidad y Electrónica, UPV-EHU apdo. 644, 48080 Bilbao, España
Magdalena Caro
Affiliation:
Centro Atómico Bariloche - Instituto Balseiro, 8400 Bariloche, Argentina
Get access

Abstract

Starting from two equilibrium solid solutions in the Au-Ni system, we analyze the change in composition due to a 400 eV/Å fast ion track simulated by molecular dynamics in the Embedded Atom approximation. We aim at determining the influence of the thermodynamic forces derived from the large thermal gradients and the rapid solidification across the solidus and liquidus on the motion of solute atoms. One dimensional gradients as well as analytic models are used to quantitatively determine the domains of influence of these forces. Evidence shows that the liquidus and solidus equilibrium solidification predicted by the phase diagram is not reached during the track. The solute concentration is mainly determined by the combined diffusion and thermomigration mechanisms in the liquid stage.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 703: Symposia U/V – Nanophase and Nanocomposite Materials IV , 2001 , V6.26
Copyright
Copyright © Materials Research Society 2002

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Stark, J.P., Solid State Diffusion, (John Wiley & Sons, 1976) p. 124.Google Scholar
2. Porter, D.A. and Easterling, K.E., Phase transformations in metals and alloys, 2nd ed. (Chapman & Hall, London, 1992) pp. 208–214.Google Scholar
3. Lopasso, E.M., Caro, M. and Caro, A., Phys. Rev. B 63, 174105 (2001).Google Scholar
4. Massalski, Thaddeus B. (editor), Binary Alloy Phase Diagrams, 2nd ed. ASM International (William W. Scott Jr., 1992) pp. 402–404.Google Scholar
5. Arregui, E. Ogando, Caro, M. and Caro, A.: Embedded Atom Model Prediction of the Au-Ni Phase Diagram, submitted for publication.Google Scholar
6. Foiles, S.M., Baskes, M.I. and Daw, M.S., Phys. Rev. B 33, 7983 (1986).Google Scholar