Abstract
Influence of melting conditions on the structure of AL30 alloy has been studied. To this end, the temperature dependences of physical properties of liquid alloy has been investigated. In is shown, that the formation of the microhomogeneous and the equilibrium alloy structure during melting process leads to significant decreasing of amounts of eutectic silicon. However, the amounts of primary α-aluminum solid solution and intermetallic compounds with dendritic form are increasing. Such treatment leads to decreasing of size of primary α-aluminum solid solution particles. On the base of experiments the physical model of aluminum-silicon alloy solidification was proposed.
Highlights
Aluminium-silicon alloy AL-30 is included in the group of the most well-known and used materials in industry
The structural components of the cast alloy are: - dendrites α-solid solution based on aluminium; - based on α-solid solution of aluminium and silicon eutectic; - based on α-solid solution of aluminium and intermetallic phases (FeMnCu)3Si3Al5 of skeletal morphology eutectic; - and FeSiAl5 phase needle-like morphology, very undesirable in structure
The thermo-temporal processing technique (TTPT) influence analysis compound effect on the cast metal solidification process and the structure was performed on samples of two series of melts: the enterprise technology and the technology of TTPT melt
Summary
Aluminium-silicon alloy AL-30 is included in the group of the most well-known and used materials in industry. Besides aluminium it includes 7,0-8,0 % Si, 1,0-1,5 % Сu, 0,3 - 0,5 % Mg, to 0,7 % Fe, as well as a small amount of nickel, manganese and titanium in the range (0.2 - 0.4)% of each. The alloy components listed structural formation primary is a cause of its chemical composition. The nature of the distribution, the shape and size of the structural components is largely determined by the smelting technology, including the preparation of the charge [1]. An objective analysis of the available and accessible technology production data, structure and properties of the alloy, taking into account production specialists opinions, led us to the conclusion that structure with a uniform distribution of the preferred form phases forming it, smaller fragments and etc. is most favorable in all respects
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