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Dynamic transitions from smooth to rough to twinning in dislocation motion

Marian, Jaime and Cai, Wei and Bulatov, Vasily V. (2004) Dynamic transitions from smooth to rough to twinning in dislocation motion. Nature Materials, 3 (3). pp. 158-163. ISSN 1476-1122. doi:10.1038/nmat1072.

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The motion of dislocations in response to stress dictates the mechanical behaviour of materials. However, it is not yet possible to directly observe dislocation motion experimentally at the atomic level. Here, we present the first observations of the long-hypothesized kink-pair mechanism in action using atomistic simulations of dislocation motion in iron. In a striking deviation from the classical picture, dislocation motion at high strain rates becomes rough, resulting in spontaneous self-pinning and production of large quantities of debris. Then, at still higher strain rates, the dislocation stops abruptly and emits a twin plate that immediately takes over as the dominant mode of plastic deformation. These observations challenge the applicability of the Peierls threshold concept to the three-dimensional motion of screw dislocations at high strain rates, and suggest a new interpretation of plastic strength and microstructure of shocked metals.

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Additional Information:© 2004 Nature Publishing Group. Received 1 October 2003; Accepted 17 December 2003; Published online 8 February 2004. This work was performed under the auspices of the US Department of Energy by Lawrence Livermore National Laboratory under Contract W-7405-Eng-48.
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Department of Energy (DOE)W-7405-Eng-48
Issue or Number:3
Record Number:CaltechAUTHORS:20150408-114704440
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Official Citation:Marian, J., Cai, W., & Bulatov, V. V. (2004). Dynamic transitions from smooth to rough to twinning in dislocation motion. [10.1038/nmat1072]. Nat Mater, 3(3), 158-163
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56487
Deposited By: Jason Perez
Deposited On:08 Apr 2015 19:28
Last Modified:10 Nov 2021 20:59

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