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Phase transition in the Zr_(60)Al_(1.)Ni_(25) bulk metal{1.c glass subjected to rol{1.ng at room temperature

science{1.(Technological sciences) 2006年第6期49卷 655-662页

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 state {1. laboratory of metal matrix composites School of Materials Science engineering Shanghai Jiao Tong University Shanghai 200030 China school of {1. science engineering Taiyuan University of Science Technology Taiyuan 030024 China school of Environmental {1. engineering Shanghai Jiao Tong University Shanghai 200030 China

The microstructure evolution of the Zr60Al1.Ni25 metal{1.c glass during rol{1.ng 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 rol{1.ng, 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 rol{1.ng.

关键词： metal{1.c glasses, plastic deformation, phase transformations, shear bands.

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