Effects of gradient energy and stress terms in diffusional intermixing of multilayers

Z. Papp, D. Beke, G. L. Katona, G. Langer

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Results of simulations, carried out on the basis of our general continuum equations for the atomic currents (which allow simulations for simultaneous action of stress accumulation and relaxation as well as spinodal decomposition in diffusion intermixing) and in a deterministic discrete (Martin's) model, are presented for metallic model multilayer systems. It is shown that the results of both models for the stress-free limit are qualitatively the same and indicate that, if there is an initially wide interface, the spinodal decomposition can lead to a metastable "wave" formation in the interface. This process is asymmetrical if the diffusion coefficient has strong concentration dependence. Taking into account stress effects in the continuum model (it is not possible to do so in the discrete one) we have shown in an ideal system that - depending on the direction of the net volume transport - the stress accumulation and relaxation can enhance or diminish the curvature on the ln(I/Io) versus t curves (I/Io is the relative intensity of the first order small angle Bragg peak) caused originally by the concentration dependent diffusivities.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalDefect and Diffusion Forum
Volume216-217
Publication statusPublished - 2003

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Multilayers
Spinodal decomposition
gradients
Io
continuums
decomposition
Bragg angle
energy
diffusivity
diffusion coefficient
simulation
curvature
curves

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Effects of gradient energy and stress terms in diffusional intermixing of multilayers. / Papp, Z.; Beke, D.; Katona, G. L.; Langer, G.

In: Defect and Diffusion Forum, Vol. 216-217, 2003, p. 1-12.

Research output: Contribution to journalArticle

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