Formation of Nanocrystalline/Amorphous Fe-Ni-Co-Zr-B Alloys by Mechanical Alloying

摘要

Mechanical alloying has been used widely as a powder processing route to produce non-equilibrium microstructure of nanocrystalline and/or amorphous phases. It involves high energy ball milling of the starting powder materials which undergo repeat deformation, fracture and welding processes. This technique has been applied to a range of metals, semiconductors and ceramics. So far, the transformation kinetics of mechanically alloyed nanostructured/amorphous materials is mainly focussed on either elemental or binary alloy systems. However, there is still a lack of understanding of the mechanically induced nanocrystalline/amorphous formation kinetics for multicomponent alloys. This papers gives recent results of the microstructural development during the mechanical alloying of Fe-Ni-Co-Zr-B alloys, which have been developed for bulk amorphous alloys with potential soft magnetic applications. In addition, it will discuss the mechanism and kinetics of the nanocrystalline/amorphous formation during alloying process.