Abstract
By means of atomistic simulations, we demonstrate that a dislocation core exhibits intermittent quasistatic restructuring during incremental shear within the same Peierls valley. This can be regarded as a stick-slip transition, which is also reproduced for a one-dimensional Frenkel-Kontorova (FK) chain. However, on a sub-Burgers vector scale of length, it is very difficult to assign a sense of unidirectional motion of dislocation within the same Peierls valley and the conventional techniques of describing the dislocation core position lacks the essential resolution. In this scenario, we have applied the technique of principal component (PCA) analysis in an innovative way to establish the correspondence between a real physical system and its ideal one-dimensional model. Our analysis show that the projections of the atomic trajectories on the principle directions further corroborate the efficacy of the one-dimensional FK chain in revealing the complex three-dimensional structure of the dislocation core.
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Bhattacharya, M., Dutta, A., Barat, P. (2014). Stick Slip Response of Dislocation Core. In: TMS 2014: 143rd Annual Meeting & Exhibition. Springer, Cham. https://doi.org/10.1007/978-3-319-48237-8_34
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DOI: https://doi.org/10.1007/978-3-319-48237-8_34
Publisher Name: Springer, Cham
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