Abstract
Interfaces play a critical role in controlling mechanical properties of many engineering materials. This study reports the segregation of Co and Y at the interfaces between 18R type long-period stacking ordered (LPSO) structure and β-Mg24Y5 in an as-cast Mg-Co-Y alloy. Segregation of Co and Y in the 18R type LPSO structure has a huge impact on the interfacial segregation. Steps and locally periodic clusters were observed in the interfaces and atomic-resolution energy-dispersive X-ray spectroscopy (EDS) mapping has been carried out to investigate their structure. The locally periodic clusters consist of Co- and Y-rich columns. The appearance of major side facets (MSF) follows Near coincidence site (NCS) method and it is founded that the locations of locally periodic clusters also follow the theory of NCS method.
Published Version
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