首页|The growth of β phase in Mg-Gd-Y-Ni alloy by experimental and first-principles study
The growth of β phase in Mg-Gd-Y-Ni alloy by experimental and first-principles study
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The paper reports on the atomic investigation about β phase in Mg96Gd2Y1Ni1 alloy by using the first-principles study and the high-angle an-nular dark-field scanning transmission electron microscope(HAADF-STEM)corrected by atomic Cs.By using HAADF-STEM,the rectangularβ phases were observed in the underage and peak aging stages in Mg96Gd2Y1Ni1 alloy.The β phase could be precipitated from the previously precipitated β phase,and the β phase grew in steps when it was precipitated.A special transition structure of three atomic layer thicknesses was first observed at the edge of the β phase and the structure of this interface is probably as the β/Mg1 interface for the analysis of thermodynamic characterization and electronic characterization.The β'phase and the βH structure were precipitated only at the edge of the length directions of the β phase.The β'phase continues to grow into a β phase directly without the formation of β1 phase,resulting in an increase in the length of the β phase,which is discovered for the first time.
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