Actual Problems in Machine Building 2016 No. 3

Актуальные проблемы в машиностроении. 2016. №3 Материаловедение в машиностроении ____________________________________________________________________ 369 E FFECT OF COMPLEX ALLOYING ON THERMAL EXPANSION OF Al-11% Si Afanas'ev V. K. , D.Sc. (Engineering), Professor, e-mail: in_afanaseva@mail.ru Popova M. V. , D.Sc. (Engineering), Associate Professor, e-mail: m.popova@rdtc.ru Malyuh M. A., Applicant, e-mail: malyuh_ma@umu.sibsiu.ru Siberian State Industrial University, 42 Kirov str., Novokuznetsk, 654007, Russian Federation Abstract This paper analyzes effect of complex alloying on the coefficient of linear thermal expansion (CLTE) of alloys Al-Si. In addition, the role of crystallization conditions of ingots (i.e. crystallization speed) is discussed. It was found that alloying with magnesium induces reduction of the CLTE of Al-11% Si in low and high temperature intervals considered during experiments. Moreover, further alloying with such elements as Be, Cu and Zr causes even a stronger reduction of the coefficient of linear expansion in the temperature intervals considered. When alloying ingots of Al-Si-Mg-Be with Cu and then pouring them into a metal mould the observed reduction of CTLE was the largest. Keywords aluminium, alloys are aluminium-silicon, temperature coefficient of linear expansion, crystallization, alloying