Study on Nano-structured WC-Co Composite Powders Made by Mechanical Milling

摘要

Nano-structured WC-Co composite powders were prepared by high-energy mechanical milling. The microstructure of as-milled WC-Co composite powders (including grain size, lattice strain, co distribu- tion and lattice defects) was investigated by X-ray diffraction (XRD), high resolution transmission elec- tron microscopy (HRTEM) and energy dispersive X-ray spectroscopy (EDS). Nano-structured WC co- vered and separated by cobalt thin layers with average grain size less than 10 nm was obtained by high- energy mechanical milling. The morphology of WC grains is almost spherical. High-energy mechanical milling could also bring about a large number of lattice defects in WC grains.