Abstract
The morphology and the structure of βF′ metastable phase were studied in aged binary MgNd alloy by atomic-resolution scanning transmission electron microscopy (STEM). The proposed three categories of βF′ − βF′ configurations are respectively aligned, staggered and inserted configurations, which can explain well the β′′′ structure proposed previously based on the experimental images and constructed models. The inserted βF′ − βF′ configuration is the most important one during the structural evolution of aging, which play a crucial role in the in-situ transformation from the D019-like to the quasi-β1 structures.
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