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Mechanism of Strain Hardening Of Magnesium Single-Crystals: Discrete Dislocation Dynamics Simulations
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1 Department of Mechanics, Sichuan University, Chengdu, 610065, China
* Corresponding Author: Haidong Fan. Email:
The International Conference on Computational & Experimental Engineering and Sciences 2023, 25(2), 1-1. https://doi.org/10.32604/icces.2023.09981
Abstract
Poor ductility heavily limits the industrial application of magnesium (Mg) alloys, and pyramidal dislocations
are an important deformation mode for ductility enhancement. In this work, discrete dislocation dynamics
(DDD) simulations were performed to study the mechanical behavior and dislocation evolution of Mg singlecrystals compressed along c-axis. Especially, basal-transition and cross-slip algorithms of pyramidal
dislocations were proposed and introduced in the DDD method. Simulation results show that basaltransition is an important mechanism for the strong strain hardening observed during c-axis compression
of Mg single-crystals. Since the basal-transition events are thermally activated, increasing temperature leads
to a high strain hardening rate. During the deformation, the dislocations on first-order pyramidal
planes mostly cross slip onto second-order pyramidal planes and few are transited onto basal planes, while
dislocations on second-order pyramidal planes are mostly transited onto basal planes directly. In
addition, the basal-transition behavior is an important reason for the formation of dislocation loops and
dislocation steps observed in experiments. The current work provides new mechanisms for the pyramidal
dislocations, which are significant for understanding the behaviors of pyramidal dislocations and ductility
enhancement of Mg alloys.
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Cite This Article
APA Style
Li, M., Tian, X., Jiang, W., Wang, Q., Fan, H. (2023). Mechanism of strain hardening of magnesium single-crystals: discrete dislocation dynamics simulations.
The International Conference on Computational & Experimental Engineering and Sciences,
25(2), 1–1.
https://doi.org/10.32604/icces.2023.09981
Vancouver Style
Li M, Tian X, Jiang W, Wang Q, Fan H. Mechanism of strain hardening of magnesium single-crystals: discrete dislocation dynamics simulations. Int Conf Comput Exp Eng Sciences. 2023;25(2):1–1.
https://doi.org/10.32604/icces.2023.09981
IEEE Style
M. Li, X. Tian, W. Jiang, Q. Wang, and H. Fan, “Mechanism of Strain Hardening Of Magnesium Single-Crystals: Discrete Dislocation Dynamics Simulations,”
Int. Conf. Comput. Exp. Eng. Sciences, vol. 25, no. 2, pp. 1–1, 2023.
https://doi.org/10.32604/icces.2023.09981
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