Non-dissociated <c+a> dislocations in an AZ31 alloy revealed by transmission electron microscopy
Luoning Ma, Kelvin Y. Xie, John Cai, Kevin J. Hemker
Abstract
<c+a> dislocations in pure Mg have been reported to dissociate on basal planes, resulting in a sessile configuration that limits the ductility and formability of Mg. In this study, careful tilting experiments and weak-beam dark-field electron microscopy observations elucidated that <c+a> dislocations in the commercial alloy AZ31 remain compact without apparent dissociation. The stabilization of the <c+a> dislocation core structure with Al and Zn alloying may explain the improved strain to failure in the AZ31 alloy as compared to pure Mg samples.
Topics & Concepts
Materials scienceTransmission electron microscopyAlloyDislocationDissociation (chemistry)CrystallographyDark field microscopyDuctility (Earth science)Electron microscopeFormabilityMetallurgyComposite materialMicroscopyNanotechnologyOpticsCreepChemistryPhysical chemistryPhysicsMagnesium Alloys: Properties and ApplicationsAluminum Alloys Composites PropertiesAluminum Alloy Microstructure Properties