Abstract
In situ straining tests in high purity α-Fe thin foils at low temperatures1 have demonstrated that crystal line defects, called dislocations, have a jerky type of motion made of intermittent long jumps of several nanometres. This observation conflicts with the standard Peierls mechanism for plastic deformation in body-centred cubic crystals, where the screw dislocation jumps are limited by inter-reticular distances, that is, distances of a few angstroms. Employing atomic-scale simulations, we show that although the short jumps are initially more favourable, their realization requires the propagation of a kinked profile along the dislocation line, which yields coherent atomic vibrations acting as travelling thermal spikes. Such local heat bursts favour the thermally assisted nucleation of new kinks in the wake of primary ones. The accumulation of new kinks leads to long dislocation jumps like those observed experimentally. Our study constitutes an important step towards predictive atomic-scale theory for materials deformation.
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Data availability
The materials employed for computations and the data that support the findings of the present study are available upon reasonable request from the authors.
Code availability
The numerical codes developed in this work are available upon reasonable request from the corresponding author.
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Acknowledgements
We gratefully acknowledge D. Caillard and D. Rodney for fruitful discussions.
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Under the supervision of L.P., A.S. realized the MD simulations associated with Fig. 2a,b and Supplementary Figs. 2a,b and 3a,b. L.P. developed the theory, performed the statistical computations and wrote the manuscript and Supplementary Information.
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Supplementary Discussion in sections with Figs. 1–9.
Supplementary Video 1
Time evolution of the dislocation profile along the standard Peierls process for a primary kink pair at τyz = 400 MPa and T = 0 K.
Supplementary Video 2
Time evolution of the dislocation profile along the process of macro-kink pair nucleation at τyz = 450 MPa and T = 0 K.
Supplementary Video 3
Time evolution of the dislocation bearing two separated kink pairs at τyz = 450 MPa and T = 0 K.
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Proville, L., Choudhury, A. Unravelling the jerky glide of dislocations in body-centred cubic crystals. Nat. Mater. 23, 47–51 (2024). https://doi.org/10.1038/s41563-023-01728-5
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DOI: https://doi.org/10.1038/s41563-023-01728-5