Abstract:
:Deformation twins are three-dimensional domains, traditionally viewed as ellipsoids because of their two-dimensional lenticular sections. In this work, we performed statistical analysis of twin shapes viewing along three orthogonal directions: the 'dark side' (DS) view along the twin shear direction (η1), the twinning plane normal (TPN) view (k1) and the 'bright side' (BS) view along the direction λ(=k1 × η1). Our electron back-scatter diffraction results show that twins in the DS and BS views normally exhibit a lenticular shape, whereas they show an irregular shape in the TPN view. Moreover, the findings in the TPN view revealed that twins grow faster along λ the lateral direction than along η1 the forward propagation direction at the initial stages of twin growth. These twin sections are irregular, indicating that growth is locally controlled and the overall shape is not perfectly ellipsoidal. We explain these findings using atomistic models, and ascribe them to differences in the mobility of the edge and screw components of the twinning dislocations.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Liu Y,Tang PZ,Gong MY,McCabe RJ,Wang J,Tomé CNdoi
10.1038/s41467-019-10573-7subject
Has Abstractpub_date
2019-07-25 00:00:00pages
3308issue
1issn
2041-1723pii
10.1038/s41467-019-10573-7journal_volume
10pub_type
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