A pseudo-binary interdiffusion study in the beta-Ni(Pt)Al phase

TL;DR

This study investigates interdiffusion in the beta-Ni(Pt)Al phase, revealing how Pt content influences diffusion coefficients and suggesting Pt prefers to replace Ni antisites, supported by experimental and theoretical insights.

Contribution

It provides new experimental interdiffusion data in beta-Ni(Pt)Al and links these findings to theoretical predictions about vacancy energies and site preferences.

Findings

Interdiffusion coefficients increase with Pt content.

Pt prefers to replace Ni antisites.

Diffusion behavior aligns with theoretical vacancy energy predictions.

Abstract

Interdiffusion study is conducted in the Ni-rich part of the beta-Ni(Pt)Al phase following the pseudo-binary approach. Interdiffusion coefficients over the whole composition range considered in this study increases with the increase in Pt content, which is in line with the theoretical study predicting the decrease in vacancy formation and migration energy because of Pt addition. The trend of change in diffusion coefficient with the increase in Ni and Pt content indicates that Pt preferably replaces Ni antisites.