Journal
SCRIPTA MATERIALIA
Volume 182, Issue -, Pages 53-56Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.02.033
Keywords
Mg-Y alloys; < c plus a > slip; Segregation; Monte Carlo; Molecular dynamics
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [STU 611/2-1, SPP 2006]
- National Science Foundation [DMR-1709236]
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We study the effect of solute segregation on pyramidal to basal transformation of < c + a > edge dislocations in a model Mg-Y alloy, using a hybrid Monte Carlo/Molecular Dynamics method. While a random solute distribution has no appreciable effect on this undesirable transition, a solute cloud around the dislocation slows and effectively prevents it in case of Mg-3 at % Y alloy. Comparing with the time scale required for diffusion of Y to the dislocation, suggests that segregation of Y and other fast diffusing elements can be engineered to prohibit this glissile to sessile transition, and stabilize the pyramidal glide of < c + a > dislocations. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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