The calculation of the diffusion coefficients in ternary multiphase Ti-NiAl system

TL;DR

This paper introduces a new mass conservation method for calculating diffusion coefficients in complex ternary multiphase systems, demonstrated on the Ti-NiAl system with minimal experimental data.

Contribution

The paper proposes a novel mass conservation approach for diffusion coefficient determination in ternary systems, requiring only a single experimental result.

Findings

The method successfully calculates diffusion coefficients in the Ti-NiAl system.

It simplifies the process by needing only one experimental measurement.

The approach is applicable to systems with linearly varying compositions.

Abstract

In this paper the problem of determination of the diffusion coefficients in a ternary multiphase system is discussed. In the literature there is a lack of data concerning the approximation method which allows to determine diffusion coefficients in such complicated systems. We propose the mass conservation method (MCA) for calculation the diffusivities in phases where the differences in composition is linear. Only one experimental results is needed for determination of the diffusion data. The method is implemented and checked under ternary Ti-NiAl system - this system characterize occurrence three intermetallic phases in diffusion couple Ti-NiAl.