Direct observation of dislocation dissociation and Suzuki segregation in a Mg–Zn–Y alloy by aberration-corrected scanning transmission electron microscopy
作者： Zhiqing Yang , Matthew F. Chisholm , Gerd Duscher , Xiuliang Ma , Stephen J. Pennycook
DOI: 10.1016/J.ACTAMAT.2012.09.067
关键词:
摘要: Abstract Crystal defects in a plastically deformed Mg–Zn–Y alloy have been studied on the atomic scale using aberration-corrected scanning transmission electron microscopy, providing important structural data for understanding material’s deformation behavior and strengthening mechanisms. Atomic structures of stacking faults resulting from dissociation different types dislocations characterized experimentally, modeled. Suzuki segregation Zn Y along formed through dislocation during plastic at 300 °C is confirmed experimentally level. The fault energy evaluated to be range 4.0–10.3 mJ m−2. newly nanometer-wide with their Zn/Y Mg grains play an role superior strength this elevated temperatures.
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