for the distribution of a high content 10 vol of Y 2 O 3 nanoparticles in copper matrix composites.Ball Milling Process To Get Copper Nano Powders Production of nanocrystalline powders by high-energy ball May 19 owing to the continuous collision between stainless steel balls and the powder during the ball milling process i'll give you an answer from the little hindsight (few years) i have on the subject of multicomponent powders high energy ball milling,