Cottrell atmospheres along dislocations in long-period stacking ordered phases in a Mg–Zn–Y alloy. (May 2016)

• Record Type: Journal Article
• Authors: Hu, W.W.; Yang, Z.Q.; Ye, H.Q.
• Is Part Of: Scripta materialia. Volume 117(2016)
• Page Start: 77
• Page End: 80
• Publication Date: 2016-05
• Subjects: Mg alloy -- Long-period stacking ordered phase -- Plastic deformation -- Dislocation -- Cottrell atmospheres; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.02.030
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Dislocations and local chemistries around them in plastically deformed long-period stacking ordered phases in a Mg–Zn–Y alloy have been investigated by the combination of atomic resolution electron microscopy imaging and nano-probe energy dispersive X-ray spectroscopy measurements. Zn/Y Cottrell atmospheres were observed along dislocations at kink boundaries and individual dislocations in bulk long-period stacking ordered phase. Evidence for unpinning of dislocations from Cottrell atmospheres was also observed. A binding energy of about 0.05 eV is estimated between the dislocations and solute atoms trapped within the atmospheres. Graphical abstract: