In-situ formed Cu-based nanocomposite by hot pressing of mechanically alloyed Cu-Zr-Ti composites containing WC particles as a second phase

摘要

In the present study, WC/Cu_(60)Zr_(30)Ti_(10) metallic glass composite powders were prepared by mechanical alloying of pure Cu, Zr, Ti, and WC powder mixtures. Cu_(60)Zr_(30)Ti_(10) metallic glass composite powders were obtained after 5 h of milling as confirmed by X-ray diffraction and differential scanning calorimetry. The metallic glass composites powders were found to exhibit a supercooled liquid region before crystallization. Bulk metallic glass composite BMG with submicron WC particles homogeneously embedded in a highly dense nanocrystalline/amorphous matrix was successfully prepared. It was found that the pressure could enhance the thermal stability and promote nanocrystallization of WC/Cu_(60)Zr_(30)Ti_(10) BMG composites.