Activating profuse pyramidal slips in magnesium alloys via raising strain rate to dynamic level

Pyramidal slip is critically important for ductility improvement of Mg alloys since it is the exclusively remained mode to accommodate strain along c-axis of α-Mg matrix during the later stage of deformation. The routes of promoting pyramidal slips are still limited. In this letter, we raise the ten...

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Bibliographic Details
Published in:Journal of alloys and compounds 2016-12, Vol.688, p.149-152
Main Authors: Pan, Hucheng, Qin, Gaowu, Huang, Yunmiao, Yang, Qingshan, Ren, Yuping, Song, Bo, Chai, Linjiang, Zhao, Zipeng
Format: Article
Language:English
Subjects:
Defects
Electron microscopy
Mg alloys
Microstructure
Pyramidal slip
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Summary:Pyramidal slip is critically important for ductility improvement of Mg alloys since it is the exclusively remained mode to accommodate strain along c-axis of α-Mg matrix during the later stage of deformation. The routes of promoting pyramidal slips are still limited. In this letter, we raise the tensile strain rate to dynamic level of 2000/s and effectively enhance both pyramidal and basal types dislocation activities in Mg-Sn binary alloys. The pyramidal dislocation activities could be rationalized by the critical resolved shear stress variations with strain rates. The enhanced density of both and dislocations lead to the positive strain-rate sensitivity of ultimate tensile strength and elongation. •Pyramidal dislocation activity can be enhanced in Mg alloy by raising strain rate.•Enhanced dislocation could be ascribed to critical resolved shear stress variation.•Dislocations lead to positive strain-rate sensitivity of strength and elongation.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2016.07.097