Актуальные проблемы в машиностроении. 2016. №3

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Актуальные проблемы в машиностроении. 2016. №3 Материаловедение
в машиностроении
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EFFECT OF COMPLEX ALLOYING ON THERMAL EXPANSION OF Al-11% Si
Afanas'ev V. K., (Engineering), Professor, e-mail:
Popova M. V., (Engineering), Associate Professor, e-mail:
Malyuh M. A., Applicant, e-mail:
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