Hedvall Effect in Self-Propagating High-Temperature Synthesis in Mechanically Activated Compositions
M. A. Korchagin1,2, A. I. Gavrilov1, D. V. Dudina1,3, B. B. Bokhonov1, N. V. Bulina1
1Institute of Solid State Chemistry and Mechanochemistry Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630128 Russia
2Novosibirsk State Technical University, Novosibirsk, 630073 Russia
3Lavrent'ev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
Keywords: Hedvall effect, self-propagating high-temperature synthesis, mechanical activation
Abstract
The Hedvall effect was implemented in self-propagating high-temperature synthesis (SHS) in two low-energy compositions TiNi + 1.1C and Ni3Al + 1.2Si using preliminary mechanical activation (MA) in an energy-intensive planetary ball mill. The dependences of the initiation temperature and the maximum reaction temperature on the MA time were obtained. The MA modes providing the solid-state mode of the self-propagating reaction were determined. The results of X-ray phase and electron microscopic examination of MA and SHS products are given.
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