Phase transition in the Zr_(60)Al_(15)Ni_(25) bulk metallic glass subjected to rolling at room temperature  

作　　者：YAN Zhijie1, 2, LI Jinfu1, ZHOU Yaohe1 & WU Yanqing3 1. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China 2. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China 3. School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China 

出　　处：《Science China(Technological Sciences)》2006年第6期655-662,共8页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.50071032);National Science Foundation for Post-doctoral Scientists of China,the Natural Science Foundation of Shanxi Province,China(Grant No.20051032);the Shanxi Provincial Foundation for Leaders of Disciplines in Science and the Doctoral Foundation of Taiyuan University of Science and Technology.

摘　　要：The microstructure evolution of the Zr60Al15Ni25 metallic glass during rolling at room temperature is investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC); high-resolution transmission electron microscopy (HREM). The results show that the values of full width at half maximum (FWHM) of the XRD patterns; exothermic enthalpy ΔH of DSC plots do not monotonically change with the variation of deformation degrees . As is not large than 20%, the values of FWHM; ΔH are lower than that of the as-cast state. When reaches 30%, the values of FWHM; ΔH become larger than that of the as-cast state, while their values begin to decrease again as reaches about 85%. These results indicate that the reversible transitions between ordered; disordered atomic configurations occur during rolling, which is further verified by the HREM images. The reversible phase transition can be explained by the competition between the diffusion controlled reordering; shear-induced disordering during rolling.

关 键 词：metallic glasses  plastic deformation  phase transformations  shear bands. 

分 类 号：TG335[金属学及工艺—金属压力加工]