Kink formation and concomitant twin nucleation in Mg–Y

[Display omitted] During in situ tensile loading of a Mg–2.5wt%Y alloy, a large kink band was observed. The orientation of the kink band varies continuously with a maximum misorientation angle of 18° with respect to the matrix grain. The formation of the kink band is accompanied by the nucleation of...

Full description

Saved in:
Bibliographic Details
Published in:Scripta materialia 2016-01, Vol.111, p.68-71
Main Authors: Wang, L., Sabisch, J., Lilleodden, E.T.
Format: Article
Language:English
Subjects:
Boundaries
Formations
Kink band
Kink bands
Magnesium alloys
Magnesium base alloys
Nucleation
Orientation
Stacking fault energy
Tensile testing
Twinning
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] During in situ tensile loading of a Mg–2.5wt%Y alloy, a large kink band was observed. The orientation of the kink band varies continuously with a maximum misorientation angle of 18° with respect to the matrix grain. The formation of the kink band is accompanied by the nucleation of numerous {101¯2} twins at the kink boundaries. A mechanistic model is proposed to account for this unique kink band and concomitant twin nucleation via dissociation of basal dislocations. This mechanism is aided by the presence of Y, which suppresses {101¯2} twinning and simultaneously decreases the stacking fault energy.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2015.08.016