Formation of Σ3{110} incoherent twin boundaries through geometrically necessary boundaries in an Al-8Zn alloy subjected to one pass of equal channel angular pressing
Journal article
Submitted version
Permanent lenke
http://hdl.handle.net/11250/2562597Utgivelsesdato
2018Metadata
Vis full innførselSamlinger
- Institutt for materialteknologi [2563]
- Publikasjoner fra CRIStin - NTNU [38688]
Originalversjon
Journal of Alloys and Compounds. 2018, 762 190-195. https://doi.org/10.1016/j.jallcom.2018.05.168Sammendrag
For coarse grained (CG) alloys with high stacking fault energies (SFEs), like aluminum, deformation twins can rarely form. Here, we report that Σ3{110} incoherent twin boundaries (ITBs) could be generated in a CG Al-8Zn alloy by one pass of ECAP. A systematic investigation shows that the Σ3{110} ITBs are formed by gradual evolution from geometrically necessary boundaries (GNBs) delineating deformation bands (DBs) by lattice rotation via <111>-twist CSL boundaries. This is a new deformation mechanism in Al alloys, which has never been reported.