A study of processes concerned with formation of dispersion-strengthened copper during mechanical alloying by high-resolution scanning electron microscopy

摘要

High-resolution scanning electron microscopy was used to investigate the processes of microstructure formation in dispersion-strengthened copper during mechanical alloying. A function of intragrouped correlation was used for quantitative estimation of strengthening particle distribution. It was shown that, in studying the microstructure change during mechanical alloying, it can be used not only for characterizing the particle distribution but also for determination of their average sizes and distance among them. Distribution of strengthening particles in copper matrix free of their accumulation was found after 20 h of milling in a high-energy planetary mill. A correlation among formation of the laminated structure in powder, strengthening particle size reduction and formation of their accumulation was found. If strengthening particles are distributed irregularly, nanosized granular matrix structure is found to be irregular too.