Investigation of the Structure Kinetics of Crystallization Cu_45+xTi_55-x Alloys Prepared by Mechanical Alloying Technique

摘要

Mechanical alloying (MA) technique has been used to produce amorphous phases of Cu_45+xTi_55-x (x=0, 5, 10) system. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC) were used to investigate the structure, microstructure and morphology as well as the thermal stability and crystallization process in such a system. No diffraction peaks corresponding to compounds from Cu-Ti system were observed throughout the amorphization reaction. The amorphous phase of Cu_45+xTi_55-x has occurred after 6 hours of milling. This MA time is unusually short for producing amorphous phases in an alloy consisting of early-late transition metals. The crystallization temperatures of the amorphous Cu_45+xTi_55-x alloys were obtained at different heating rate. The activation energies of the studied compositions were deduced using Kissinger method.