Formation and Processing of Nanocrystalline Materials by Electrical Discharge Mechanical Milling
|Andrzej Calka , D. Wexler|
Faculty of Enginneering, University of Wollongong, Wollongong NSW 2522, Australia
A novel device for mechanical milling, incorporating high voltage, low current electrical discharges was constructed and its application for materials processing investigated . In this paper we present recently obtained results on nanostructural phase formation using this method. Milling experiments were performed under different discharge conditions and resulted in completely different reaction paths for the same reacting species. The effects of spark discharge milling condition on formation of nanocrystals were studied in a large number of different materials. It was found that nanocrystallisation of metallic glass ribbons occurs over very short milling times and is accompanied by the formation of fine particles with narrow particle size distributions. The effect of spark milling on phase transformations was also studied. Strong effects of the introduction of spark discharge conditions on nucleation and interface-controlled transformations were observed.
Presentation: oral at E-MRS Fall Meeting 2003, Symposium G, by Andrzej Calka
See On-line Journal of E-MRS Fall Meeting 2003
Submitted: 2003-06-26 04:42 Revised: 2009-06-08 12:55