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

Zhao, Shijun; Osetsky, Yuri N.; Zhang, Yanwen

doi:10.1016/j.jallcom.2017.01.165

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

Journal Article · Wed Jan 18 23:00:00 EST 2017 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2017.01.165· OSTI ID:1361346

Zhao, Shijun ^[1]; Osetsky, Yuri N. ^[1]; Zhang, Yanwen ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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 <110>{111} edge dislocation in pure Ni and equiatomic solid solution Ni_0.5Fe_0.5 (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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1361346

Alternate ID(s):: OSTI ID: 1417114
OSTI ID: 1388479

Journal Information:: Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Journal Issue: C Vol. 701; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Density functional theory calculations of generalized stacking fault energy surfaces for eight face-centered cubic transition metals Su, Yanqing; Xu, Shuozhi; Beyerlein, Irene J. Journal of Applied Physics, Vol. 126, Issue 10 https://doi.org/10.1063/1.5115282	journal	September 2019
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Related Subjects

36 MATERIALS SCIENCE
Edge dislocation
NiFe alloys
concentrated solid solution alloys
dislocation velocity
molecular dynamics simulations

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

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