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Actual Problems in Machine Building. Vol. 4. N 1. 2017
Materials Science
in Machine Building
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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.ruMalyuh M.A.
1
,
Applicant, e-mail:
starostina_ma1976@mail.ruLavrova N.B.
2
,
Senior Lecturer, e-mail:
lavrova-nataly2016@yandex.ru1
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