Authors: Yuanjie Huang
Dislocations and dislocation dynamics are the cores of material plasticity. In this work, we focus on and explore electric forces caused by external electric field upon dislocations and intrinsic electric forces between dislocations. Here we found that there exist a threshold electric field above which the electric field-induced force can enable dislocations glide and to one’s surprise, being subject to the identical electric field, some dislocations move in one direction but others move reversely, which are in agreement with experimental observations and may be the microscopic physical mechanism of electroplasticity. Besides the classical known mechanic force, an important intrinsic electric force exists between dislocations, which is uncovered here for the first time and has been neglected since discovery of dislocations. The electric forces are short-range and apparent when the distance between dislocations is only several nanometers. These findings maybe assist people in understanding correlated physical phenomena, for instance, eletroplasticity, understanding actual underlying physics of plastic deformations and designing next-generation nano-devices.
Comments: 17 Pages.
[v1] 2018-08-01 01:01:47
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