Application of Mechanical Alloying in Synthesis of Intermetallics

P. Nováka, F. Průšaa, K. Nováa, A. Bernatikováa, P. Salvetra, J. Kopečekb, P. Haušildc aUniversity of Chemistry and Technology, Prague, Department of Metals and Corrosion Engineering, Technická 5, 166 28 Prague 6, Czech Republic bInstitute of Physics of the ASCR, v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic cCzech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Materials, Trojanova 13, 120 00 Prague 2, Czech Republic

Full Text PDF

Mechanical alloying is an interesting method of direct synthesis of various kinds of compounds and preparation of solid solutions using pure elemental powders by high-energy milling. In this paper, the modified process of mechanical alloying, which was developed at UCT Prague, is applied for the synthesis of intermetallics. This process - ultra-high energy mechanical alloying - uses extremely high ball-to-powder ratio (50-70:1), thus enabling very high degree of deformation of the powders, as well as the friction. Due to these effects, the temperatures up to 700° can be probably achieved locally for a short period. It enables to initiate the same chemical reactions between metallic powders as in self-propagating high-temperature synthesis. This study compares the ultra-high energy mechanical alloying with self-propagating high-temperature synthesis in selected alloy systems (Fe-Al, Ni-Ti, Fe-Al-Si) in order to explain the formation of intermetallics in this innovative process.

DOI:10.12693/APhysPolA.134.720 PACS numbers: 61.66.Dk, 61.05.cp