Fabrication and characterization of nanocrystalline Nb-W-Mo-Zr alloy powder by ball milling

摘要

A superfine nanocrystalline Nb-W-Mo-Zr alloy powder was successfully prepared by high energy ball milling at room temperature. The particle size, morphology, and structural changes were characterized by means of laser particle size analysis (LPSA), X-ray diffraction (XRD), and scanning electron microscopy (SEM). Experimental results showed that milling velocity was a decisive factor in controlling the production of alloy powders. A 450 rpm-ball milling had led to nanocrystalline Nb-W-Mo-Zr alloy powder particles with a crystallite size of 14 nm. With 250 rpm velocity, cold welding was found to be the dominant mechanism during milling without formation of any solid solution even after 60 h of milling time.