Diffusion In Multicomponent Alloys

Keywords

Interdiffusion; Intrinsic diffusion; Multicomponent alloy; Tracer diffusion; Transfer matrix method; Zero flux plane

Abstract

Most commercially available engineering materials contain three or more components. The diffusion behavior in these materials is important since phenomena such as phase transformations, nucleation and growth, precipitation, surface modification, etc., are controlled and influenced by the rate of diffusion. In this chapter, phenomenological description of diffusion in ternary and higher order multicomponent alloys is presented to bring out the diffusional interactions among the diffusing species and discuss the methods to calculate diffusion coefficients. Diffusional interactions become more complicated with an increase in the number of components. The physical meaning of the diffusion coefficients also becomes obscure since more parameters are involved in order to completely describe the systems. The main difference between binary and higher-order diffusion is that the diffusional interactions among the various (. n-1) independent diffusing species need to be considered in the complete description of the interdiffusion process in multicomponent systems. Much of the current research aims to circumvent the overwhelming diffusion parameters and potentially simplify the understanding and calculation in multicomponent alloys. In this chapter, we present and discuss the main approaches adopted in the phenomenological description and measurement of diffusion coefficients incorporating such diffusional interactions among the components.

Publication Date

4-10-2017

Publication Title

Handbook of Solid State Diffusion

Number of Pages

203-237

Document Type

Article; Book Chapter

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/B978-0-12-804287-8.00004-X

Socpus ID

85040355901 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85040355901

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