Abstract
Hexagonal-closed packed materials (HCP) materials has attracted interest recently due to their unique physical and mechanical properties. The low density and the high strength to weight ratio of such materials make them excellent candidates to save structural weight and consequently fuel consumption in both automotive and aircraft fields. However, the deformation behavior of HCP metals hasn’t been completely understood as prior work still lack a detailed understanding on the activation of slip planes and twinning. In addition, the work-hardening behavior and the effect of temperature and strain rate are not yet well-established. This work aims at investigating the deformation mechanisms in magnesium single crystals using Multiscale Dislocation Dynamics Plasticity (MDDP) model. In particular, we focus on modeling the deformation behavior under c-axis compression loading. Several Simulations have been carried out to study the effect of dislocation mobility dependence on the dislocation character and its consequences on the evolution of the dislocation density, the dislocation microstructure, and the hardening behavior. Preliminary results show that the experimentally observed hardening behavior can be reproduced by using linear interpolation of the mobility such that screw segments are stationary and edge segments are highly mobile.
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Jaber, W., Shehadeh, M. (2015). C-Axis Compression of Magnesium Single Crystals: Multi-Scale Dislocation Dynamics Analyses. In: Karaman, I., Arróyave, R., Masad, E. (eds) Proceedings of the TMS Middle East — Mediterranean Materials Congress on Energy and Infrastructure Systems (MEMA 2015). Springer, Cham. https://doi.org/10.1007/978-3-319-48766-3_50
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DOI: https://doi.org/10.1007/978-3-319-48766-3_50
Publisher Name: Springer, Cham
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