The effect of solute cloud formation on the second order pyramidal to basal transition of ⟨c plus a⟩ edge dislocations in Mg-Y solid solutions

SCRIPTA MATERIALIA

卷:182

Article

Utt, Daniel^1,2  Stukowski, Alexander¹  Ghazisaeidi, Maryam² 

[1] Tech Univ Darmstadt, Inst Far Materialwissensch, Fachgebiet Materialmodellierung, Otto Berndt Str 3, D-64287 Darmstadt, Germany

[2] Ohio State Univ, Mat Sci & Engn, 2041 Coll Rd, Columbus, OH 43210 USA

关键词: Mg-Y alloys;    < c plus a > slip;    Segregation;    Monte Carlo;    Molecular dynamics;   

DOI  :  10.1016/j.scriptamat.2020.02.033

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free