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《Journal of Chinese Electron Microscopy Society》 2014-01
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The effect of the microstructure of metallic glasses on the crystallization process

SONG Xiao;NI Xiao-dong;YAO Yuan;YU Ri-cheng;WEN Ping;Department of Physics,University of Science and Technology Beijing;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences;  
The annular and striped features in the bulk metallic glass samples thinned by electropolishing are researched by the means of scan transmission electron microscopy( STEM),energy dispersive spectrometry( EDS) and electron energy-loss spectroscopy( EELS). The results show that these features are resulted from thickness variation of samples instead of phase separation. Further insitu observation of the annealing sample shows that remarkable phase separations emerge in the annular or striped features; in addition,Ni and Cu concentrate on the boundary between the thicker and thinner area and significant segregation of them is observed,while the segregation of Al is unobvious. The observation indicates that the microstructures of metallic glasses have an significant effect on the phase separation in the crystallization process,and the local segregation is probably related to the preferred nucleation of Ni and Cu on the boundary between the thicker and thinner area. Also,the difference between surface diffusion and bulk diffusion is one of the factors that account for the element concentration variation in the crystallized alloy.
【Fund】: 973国家重点基础研究发展计划(No.2010CB731600)
【CateGory Index】: TG139.8
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