Atomic structure of Zr-48 Cu-45 Al-7 bulk metallic glass

作者：Guo Gu Qing; Yang Liang^*; Zhang Guo Qing

来源：Acta Physica Sinica, 2011, 60(1): 016103.

• bulk metallic glass(BMG)
• atomic structure
• glass-forming ability(GFA)
• synchrotron radiation techniques

Atomic structures of Zr-48 Cu-45 Al-7 ternary and Zr-50 Cu-50 binary metallic glasses were investigated by performing reverse Monte Carlo (RMC) simulation upon synchrotron radiation based X-ray diffraction (XRD) and extended X-ray absorption fine structure (EXAFS) data. Bond shortening in Zr-Al and Cu-Al atomic pairs was detected in Zr-48 Cu-45 Al-7 which is attributed to strong interactions between Al atoms and its neighbors. Subsequently, their atomic structure was further analyzed by Voronoi tessellation method, it was found that all kinds of Voronoi clusters have smaller volume in Zr-48 Cu-45 Al-7 than their counterparts in Zr-50 Cu-50. Accordingly it is suggested that atoms may be more densely packed in atomic structure of Zr-48 Cu-45 Al-7 ternary than in corresponding Zr-50 Cu-50 binary MG at cluster scale, which may be the structural origin of high glass-forming ability of CuZr-based bulk metallic glass prepared by Al addition.

• 出版日期2011-1
• 单位浙江理工大学; 南京航空航天大学