Abstract
Hypereutectic silumins have many positive properties - low density, high specific strength and corrosion resistance. They are non-magnetic, retain their strength at low, up to cryogenic temperatures, have a relatively low thermal expansion coefficient, high modulus of elasticity, increased wear resistance in friction pairs, etc. The structure of hypereutectic silumin is formed by a plastic eutectic matrix and brittle primary silicon crystals larger than 100 urn, and also contains crystals of aluminides of iron, copper, titanium and zirconium. Silumin of hypereutectic (18 wt% Si) composition was modified by irradiating the specimens by an intense pulsed electron beam. It was found that irradiation of hypereutectic silumin with an electron beam leads to a significant decrease in the number of micropores, the formation of a structure of high-speed cellular crystallization.
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