INFLUENCE OF HIGH-ENERGY BALL MILLING ON GRAIN SIZE AND STRUCTURE OF Al-Ti-C POWDER MIXTURE

Along with the increase in the time of high-energy ball milling, the grain size of Al-Ti-C powder mixture is decreased continuously and the distribution uniformity of each element in the mixture is improved obviously. Meanwhile, the powders are aggregated with each other. In addition, the crystal size within each powder particle is also decreased during ball milling, while the defects in the crystal are increased. After milling for a certain time, the nano-crystals are formed. Going a step further, the amorphous structure will be also produced. These factors are beneficial to diffusion and promote the completion of the synthesis reactions.