Basal-pyramidal dislocation lock in deformed magnesium

SCRIPTA MATERIALIA

卷:134

Article

Li, B.¹  Zhang, Q. W.¹  Mathaudhu, S. N.² 

[1] Univ Nevada, Dept Chem & Mat Engn, Reno, NV 89557 USA

[2] Univ Calif Riverside, Dept Mech Engn, Riverside, CA 92521 USA

关键词: Magnesium;    Dislocation;    Stacking fault;    Transmission electron microscopy;   

DOI  :  10.1016/j.scriptamat.2017.02.040

来源: Elsevier

【 摘 要 】

Dislocations and stacking faults in unalloyed magnesium processed by equal-channel-angular-extrusion are investigated by transmission electron microscopy. Stacking faults as wide as hundreds of nanometers and complex dislocation configurations are revealed, which creates diffraction contrast that is challenging to interpret. To elucidate the dislocation interaction, atomistic simulations are conducted. The concomitant results show that the leading partial dislocations on the basal and the pyramidal planes interact and form a dislocation lock, creating the diffraction contrast observed in experiments. The dislocation locks may act as obstacles to dislocation glide and contribute to hardening. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free