The study presents the results of the investigations of the effect of Cu, Ni, Cr, V, Mo and W alloy additions on the microstructure and
mechanical properties of the AlSi7Mg0.3 alloy. The examinations were performed within a project the aim of which is to elaborate an
experimental and industrial technology of producing elements of machines and devices complex in their construction, made of aluminium
alloys by the method of precision investment casting. It was demonstrated that a proper combination of alloy additions causes the
crystallization of complex intermetallic phases in the silumin, shortens the SDAS and improves the strength properties: Rm, Rp0.2,HB
hardness. Elevating these properties reduces At, which, in consequence, lowers the quality index Q of the alloy of the obtained casts.
Experimental casts were made in ceramic moulds preliminarily heated to 160 °C, into which the AlSi7Mg0.3 alloy with the additions was
cast, followed by its cooling at ambient temperature. With the purpose of increasing the value of the quality index Q, it is recommended
that the process of alloy cooling in the ceramic mould be intensified and/or a thermal treatment of the casts be performed (ageing)(T6).
The article presents the results of a comparative analysis of the metal substructure for dental prosthesis made from a Co-Cr-Mo-W alloy by
two techniques, i.e. precision investment casting and selective laser melting (SLM). It was found that the roughness of the raw surface of
the SLM sinter is higher than the roughness of the cast surface, which is compensated by the process of blast cleaning during metal
preparation for the application of a layer of porcelain. Castings have a dendritic structure, while SLM sinters are characterized by a
compact, fine-grain microstructure of the hardness higher by about 100 HV units. High performance and high costs of implementation the
SLM technology are the cause to use it for the purpose of many dental manufacturers under outsourcing rules. The result is a reduction in
manufacturing costs of the product associated with dental work time necessary to scan, designing and treatment of sinter compared with
the time needed to develop a substructure in wax, absorption in the refractory mass, casting, sand blasting and finishing. As a result of
market competition and low cost of materials, sinter costs decrease which brings the total costs related to the construction unit making
using the traditional method of casting, at far less commitment of time and greater predictability and consistent sinter quality.