Microstructural Change of Cu-Ti-B Powders during Mechanical Alloying

To produce copper composite powder with a dispersion of boride particles, mixtures of copper, titanium, and boron powders were mechanically alloyed for various milling periods by an attritor. Microstructural changes of the mechanically alloyed powders with milling were examined by X-ray diffraction, SEM, and TEM. The mixed powders become finer as the milling time increases. Structures consisting of extremely fine grains, in the nanometre size range, form in the mechanically alloyed powder after prolonged milling. The refinement of the structure in the Cu-Ti powder is accelerated by additions of boron and TiB 2 powders