Diffusion of point defects in ordered and disordered Ni–Fe alloys

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)1175-1183
Journal / PublicationJournal of Alloys and Compounds
Volume805
Early online date16 Jul 2019
Publication statusPublished - 15 Oct 2019

Abstract

We present how the ordered and disordered arrangement of elements can affect the transport properties of point defects in Ni–Fe metallic alloys using atomistic simulations. With molecular dynamics (MD) based on both first-principles calculations and empirical potentials, we show that defect diffusion slows down in the ordered Ni–Fe phases due to the decrease of effective coordination number for nearest-neighbor defect jumps. Thus, the disorder-order transition influences defect migration by changing the local atomic environment. We further elucidate that the defect diffusion in ordered and disordered phases is a result of the interplay between preferential defect diffusion and defect stability that relate to the defect energetics. These results indicate that defect evolution may be significantly delayed by embedding certain ordered structures into bulk disordered alloys, which are important to the understanding of the role of disorder in metallic alloys and provide insights on materials engineering by tuning the disorder/order level.

Research Area(s)

  • Atomistic simulations, Concentrated alloys, Diffusion coefficient, Order and disorder

Citation Format(s)

Diffusion of point defects in ordered and disordered Ni–Fe alloys. / Zhao, Shijun; Osetsky, Yuri; Zhang, Yanwen.

In: Journal of Alloys and Compounds, Vol. 805, 15.10.2019, p. 1175-1183.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review