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• W2901188694 abstract "Concentrated solid solution alloys (CSSAs), including medium- and high-entropy alloys, are currently being considered as prospective materials in many applications. The behavior of CSSAs under different conditions, including mechanical loading, differs from that of conventional alloys and has been the subject of intensive study by different techniques. In many cases, their behavior is treated by modifying solid solution hardening models, which, in principle, does not reflect many important features of CSSAs where the distinction between solute and solvent atoms is not clear. In this work, we report the results of an atomic-scale study of ½<110>{111} screw dislocation motion in an fcc equiatomic Ni-Fe alloy. Molecular dynamics simulations demonstrate that the dislocation has two distinctive modes for glide. At lower stress, dislocations move in a very rough manner that cannot be described as continuous glide but rather as jerky motion through a set of obstacles. At high stress, they glide in a manner similar to lattice friction-controlled conditions in single component systems. The stress for the transition between modes depends on the dislocation segment length and temperature. At 300 K, the flow stress saturates at ∼130 MPa for lengths above ∼140 |b| (b is the Burgers vector)." @default.
• W2901188694 created "2018-11-29" @default.
• W2901188694 creator A5014023359 @default.
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• W2901188694 date "2019-02-01" @default.
• W2901188694 modified "2023-10-17" @default.
• W2901188694 title "Two modes of screw dislocation glide in fcc single-phase concentrated alloys" @default.
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• W2901188694 doi "https://doi.org/10.1016/j.actamat.2018.11.020" @default.
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