Actual Problems in Machine Building 2017 Vol. 4 No. 1

Actual Problems in Machine Building. Vol. 4. N 1. 2017 Materials Science in Machine Building ____________________________________________________________________ 118 ТHE COMBINED EFFECT OF ALLOYING AND CRYSTALLIZATION CONDITIONS FOR MANUFACTURABILITY AND THERMAL EXPANSION OF CAST ALUMINUM ALLOYS Popova M.V. 1 , D.Sc. (Engineering), Associate Professor, e-mail: m.popova@rdtc.ru Malyuh M.A. 1 , Applicant, e-mail: starostina_ma1976@mail.ru Lavrova N.B. 2 , Senior Lecturer, e-mail: lavrova-nataly2016@yandex.ru 1 Siberian State Industrial University, 42 Kirov st., Novokuznetsk, 654007, Russian Federation 2 Siberian Federal University, 79 Avenue Free, Krasnoyarsk, 660041, Russian Federation Abstract To ensure weight perfection structures, their increased reliability and resource necessary to develop new aluminum alloys with properties that ensure the reliability and safety of operation of the structure. For space instrumentation requires the combination of high dimensional stability in wide temperature range, corrosion resistance and small specific gravity, so as a relief to orbit designs and devices contributes to a significant fuel savings. These requirements are met by alloys of Al with Si, as Al – light and ductile metal with good corrosion resistance. Temperature coefficient of linear expansion (TСLE, α) it is large enough, however, doping with silicon can be significantly reduced. The results of researches of influence of alloying and crystallization conditions for TСLE of alloys of aluminum with silicon and copper in the temperature range of 50-450 ° C test. It is shown that high-speed crystallization improves technology-lichnosti and reduces TСLE dual silumin Al– (5-20)%Si in the range of 50 ° C and 100°, and also makes a less pronounced anomaly of thermal expansion in the range of 250-350 ° C for doauthenticate alloys. Established that ternary alloys Al– Si–Cu have a lower TСLE than double the alloys Al–Si and Al–Cu is comparable concentrations. The research results can be used to produce light alloys with controlled thermal expansion. Studies show that quite reasonable may be the use of copper for making alloys with controlled thermal expansion. The fact of the strong action of silicon on the thermal expansion of the alloys Al–Cu, which may further have a significant impact on the practical working of the lungs Invar alloys. Keywords aluminium, alloys of aluminium-silicon alloys aluminium-copper, the temperature coefficient of linear expansion, crystallization, alloying