Atomic-scale dynamics of edge dislocations in Ni and concentrated solid solution NiFe alloys

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

10 Scopus Citations
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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)1003-1008
Journal / PublicationJournal of Alloys and Compounds
Volume701
Early online date19 Jan 2017
Publication statusPublished - 15 Apr 2017
Externally publishedYes

Abstract

Single-phase concentrated solid solution alloys (CSAs), including high entropy alloys, exhibit excellent mechanical properties compared to conventional dilute alloys. However, the origin of this observation is not clear yet because the dislocation properties in CSAs are poorly understood. In this work, the mobility of a ½〈110〉{111} edge dislocation in pure Ni and equiatomic solid solution Ni0.5Fe0.5 (NiFe) is studied using molecular dynamics simulations with different empirical potentials. The threshold stress to initiate dislocation movement in NiFe is found to be much higher compared to pure Ni. The drag coefficient of the dislocation motion calculated from the linear regime of dislocation velocities versus applied stress suggests that the movement of dislocations in NiFe is strongly damped compared to that in Ni. The present results indicate that the mobility of edge dislocations in fcc CSAs are controlled by the fluctuations in local stacking fault energy caused by the local variation of alloy composition.

Research Area(s)

  • Concentrated solid solution alloys, Dislocation velocity, Edge dislocation, Molecular dynamics simulations, NiFe alloys