Abstract

A high strain rate compressed Mg-Y alloy is prepared for the study of <11¯00> symmetric tilt grain boundary. A twin-like {336¯4} tilt boundary, which is formed via the evolution of {112¯1} twin boundary, is commonly found for the first time in the deformed Mg-Y alloy. Via combining high-angle annular dark-field scanning transmission electron microscopy and density functional theory calculations, the formation of {336¯4} tilt boundary and the associated segregation of Y atoms are rationalized. Such a finding provides a new vision on twinning behavior for the design of new high-performance Mg alloys.

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