Actual Problems in Machine Building 2014 No. 1

I Международная научно-практическая конференция « Актуальные проблемы в машиностроении » Материаловедение в машиностроении ___________________________________________________________________ 425 Influence of an alloying on parameters of a microstructure and physical properties of an alloy of Al-15%Si M.V. Popova, N.V. Kibko Research of influence of separate introduction in lead and beryllium fusion in a small amount on microstructure parameters, density and temperature coefficient of linear expansion of an alloy of Al-15%Si is conducted. It is established that beryllium in comparison with lead as promotes reduction of the size of silicon as a part of an eutectic of a disperse structure influences microstructure silumin more effectively. The alloying lead and beryllium reduces TKLR of an alloy of Al-15%Si in a high-temperature interval of test. Lead has the most effective impact on thermal expansion of silumin. Keywords: alloying, silumin, microstructure, temperature coefficient of linear expansion, density