期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 701, 期 -, 页码 1003-1008出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.01.165
关键词
Concentrated solid solution alloys; Edge dislocation; Dislocation velocity; NiFe alloys; Molecular dynamics simulations
资金
- Energy Dissipation to Defect Evolution (EDDE)
- Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences
- Basic Energy Sciences Materials Science and Engineering Division
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 1/2(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. (C) 2017 Elsevier B.V. All rights reserved.
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