To increase the mechanical and improve the operational properties of the AlSi25Cu4Cr and AlSi25Cu5Cr alloys, combinations of the alloying elements Ni, Co and Mo were used. The AlSi25Cu4Cr alloy was additionally alloyed with both Ni and Mo and Ni, Co and Mo, and the AlSi25Cu5Cr alloy was alloyed with Co and Mo in different concentrations. The dental alloys “wiron light” and “wironit” were used to introduce the elements Ni, Co, Mo, as well as additional amounts of Cr into the composition of the base compositions. The thermal analysis recorded a decrease in the liquidus and solidus temperatures of the base alloys, as well as a narrowing of their crystallization temperature range as a result of the added alloying elements. The influence of the used chemical elements on the phase composition of the alloys was established by X-ray diffraction. The elements Cr and Mo do not form secondary strengthening phases but dissolve in the α-solid solution. The results of the corrosion tests conducted in 1 M HCl solution and 1 M H₂SO₄ solution for 336 h and 504 h show that the elements Ni, Co and Mo improve the corrosion resistance of the alloys.

The hypereutectic aluminium-silicon alloys AlSi25Cu4Cr and AlSi25Cu5Cr are additionally alloyed with Ni, Co, Mo in different concentrations. The influence of th

The hypereutectic aluminium-silicon alloys AlSi25Cu4Cr and AlSi25Cu5Cr are alloyed with refractory metals. The AlSi25Cu4Cr alloy is additionally alloyed with bo

In this work, the mechanical properties of composites with a polymer matrix and reinforced with carbon particles have been studied. It has been established that the obtained engineering materials have increased elastic and plastic characteristics. The thermosetting polymers used are epoxy, polyester, and vinylester resins. The carbon particles are carbon nanotubes and waste carbon from the plasma decomposition of methane in the production of green hydrogen. The carbon particles used are in an amount of 1 wt% and 2 wt% of the weight of the composite, and they are not subjected to pre-treatment (modification). The studied composites are used in shipping, automotive, and aviation technology, and the presence of carbon particles in them is a prerequisite for improving their anti-radar properties.

Studies have been performed to establish the duration of the modifying effect of nanodiamond (ND) nanomodifiers on the structure of the AlSi18 alloy after the first and second melting, using a pre-modified with ND alloy. Experiments have been performed at different operating temperatures. Microstructural analysis has established the retention of the modifying effect of the used ND nanomodifier.

Two technological approaches were used to produce the hypereutectic aluminium-silicon alloys AlSi21Cu5MgCr, AlSi21Cu5Cr, AlSi25Cu4Cr and AlSi25Cu5Cr. In one case, alloys were melted from pure metals, metallurgical processing of the melts was carried out, and experimental castings were cast. In the other case, remelting of previously prepared alloys was carried out for casting test castings from the studied alloys, and the metallurgical processing of the melts was carried out at a lower temperature. The influence of the method of obtaining the alloys on their structure has been established.