on the Microstructure and Viscosity of the Al
6% SiModel Silumin in Solid and Liquid States
K. V. Nikitina,*, A. B. Finkel’shteinb,**, O. A. Chikovab,***, and I. Yu. Timoshkina
aSamara State Technical University, ul. Molodogvardeiskaya 244, Samara, 443100 Russia
*e-mail: kvn-6411@mail.ru
bUral Federal University, ul. Mira 19, Yekaterinburg, 620002 Russia
**e-mail: avinkel@mail.ru
***e-mail: chik63@mail.ru
Abstract—The influence of the structure of starting charge alloys Al–20 wt % Si on their structure after single
remelting and crystallization with an identical cooling rate of 20 K/s is investigated. It is established that the
structural transformation from the starting charge alloys stably retains, being translated in the “solid–liquid–
solid” system. The viscosimetry investigation of the melts obtained from the coarse-crystalline and the fine-
crystalline charge alloys in the heating mode to 1350
C and the subsequent cooling confirmed the conclusion
that these melts are translators of structural information. It is established that the branching temperature (hys-
teresis) of viscosity polytherms (th) in the heating and cooling modes for the melt made from the coarse-crys-
talline charge alloy is 1100C, while that for the fine-crystalline charge alloy is 1000C. It is noted that, in the
second case, the viscosity in the cooling mode below th is elevated, while the polythermal branch ascends more
steeply. These results indicate the favorability of using special methods of processing the charge metals with
the goal of laying positive structural information into them. The use of this approach is most reasonable when
obtaining aluminum-based foundry alloys.
Keywords: starting charge alloy Al–20 wt % Si, microstructure, primary silicon crystals, melt, viscosity, struc-
tural information, heterogeneity, polydispersity, monodispersity, foundry alloys
DOI: 10.3103/S1067821213040123
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