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Phase transition in the Zr_(60)Al_(15)Ni_(2.) bulk metallic glass subjected to rolling at room temperature

Science china(Technological Sciences) 2006年第6期49卷 655-662页

作者： yan zhijie1, 2. li jinfu1,{2., school of materials Science and engineering, shanghai jiao tong university, shanghai 2.003., china 2. school of materials Science and engineering, Taiyuan {12. of Science and Technology, Taiyuan 03002., china 3. school of Environmental Science and engineering, shanghai jiao tong university, shanghai 2.003., china state key {2. of metal matrix composites School of Materials Science engineering Shanghai Jiao Tong University Shanghai 200030 China school of materials Science engineering Taiyuan University of Science Technology Taiyuan 030024 China school of Environmental Science engineering Shanghai Jiao Tong University Shanghai 200030 China

The microstructure evolution of the Zr60Al15Ni2. 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 2.%, 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.

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