A1_(71.25)Cu_(16.15)Mg_(7.6)Ni_5 amorphous alloy ribbons were prepared using melt-spinning technique. The structure related to the phase transformation of the amorphous alloy ribbon was studied by X-ray diffraction and differential scanning calorimetry (DSC). It was found that the ribbon exhibits two separate diffuse shoulders with peak positions. Formation of cubic-Al was observed when the ribbon was heated beyond the primary crystallization peak. Upon secondary crystallization peak, cubic-Al, Al_3Ni and Al_2CuMg were observed. The evolution of the lattice constant, a, for the cubic-Al and Al_2CuMg, were determined by the Rietveld procedure. The lattice constant for cubic-Al remains almost constant between the primary and fully crystallization temperature after sudden change at secondary crystallization temperature. The lattice constant for Al_2CuMg increases when the temperature increases. Both crystallite size of cubic-Al and Al_2CuMg were increased as temperature increases.
展开▼
