The increasing of localized free volume in bulk metallic glass under uniaxial compression  

作　　者：邓玉福 杨飞 杨建林 张微 

机构地区：[1]College of Physical Science and Technology, Shenyang Normal University, Shenyang 110034, China

出　　处：《Chinese Physics B》2007年第7期2051-2055,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China （Grant No 10547127） and Experimental Center of Shenyang Normal University, China （Grant No SY-200506）. Acknowledgement The authors are grateful to Dr Q. S. Zhang for assistance with the quasi-static compression experiments and sample preparation. Part of this work was performed at the Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences.

摘　　要：Using transmission electron microscopy and electron diffraction, we have investigated the microstructure of a Zr55Al10Ni5Cu30 bulk metallic glass under a uniaxial compression until a failure occurs at room temperature. It is shown that the amorphous structure has changed locally in the vicinity of the failure plane after the plastic deformation. An increase in free volume is observed within the localized areas due to the concentration of plastic flow, suggesting that the increasing of local free volume dominates the deformation mechanism of the metallic glass. The effect of free volume on the ＇serrated flow＇ behaviour in the stress-strain curves during the uniaxial compression is discussed.Using transmission electron microscopy and electron diffraction, we have investigated the microstructure of a Zr55Al10Ni5Cu30 bulk metallic glass under a uniaxial compression until a failure occurs at room temperature. It is shown that the amorphous structure has changed locally in the vicinity of the failure plane after the plastic deformation. An increase in free volume is observed within the localized areas due to the concentration of plastic flow, suggesting that the increasing of local free volume dominates the deformation mechanism of the metallic glass. The effect of free volume on the ＇serrated flow＇ behaviour in the stress-strain curves during the uniaxial compression is discussed.

关 键 词：amorphous materials electron microscopy plastic deformation MICROSTRUCTURE 

分 类 号：O59[理学—应用物理]