Sn-based alloys, in particular a Sn–Ag–Cu ternary system (SAC), are used as lead-free solders in electronics and are therefore the subject of intensive research. One of the promising ways to improve properties of such solders is a synthesis of nanocomposite materials, where nanosized particles introduced into the base bulk material (matrix) allow to control the properties in a wide range of physicochemical parameters. Therefore, the study of the influence of nanosized particles (metals in bulk and nanosized forms, ceramic or carbon nanotubes) on physical and mechanical properties of base metal alloys has become particularly relevant.The tendency to reduce the size of solder joints in microelectronics increases the requirements for the reliability of solders, which can be achieved in new nanocomposite materials by the introduction of metal and ceramic nanoparticles. The positive effect of nanosized impurity elements on the stabilization of the crystalline structure of Sn-based alloys undergoing significant modifications under the influence of external influences, as well as on the improvement of physicochemical and mechanical properties confirmed by previous studies, led to spread these studies on basic eutectic and neareutectic Sn–Ag–Cu ternary alloys, namely, Sn95,80Ag3,28Cu0,93 (at. %) (Sn96,5Ag3,0Cu0,5 wt. %) та Sn94,56Ag4,14Cu1,29 (at. %) (Sn95,5Ag3,8Cu0,7 wt. %). The electrical conductivity data provide additional information on the effect of impurities on the structure and physicochemical properties of the metal matrix, which is important for understanding the microstructural transformations in the liquid state. The obtained results provided important information on the possibility of using these alloys as lead-free solders, as they showed that the addition of nanosized nickel particles does not impair the electrical properties of the solder, while, according to recent studies, the mechanical properties of brazed joints improve.The results of the influence of metal nanoparticles and carbon nanotubes on the structurally sensitive and mechanical properties of multicomponent tin-based alloys will improve the latest technologies for the manufacture of nanocomposite materials. Scientific results of the dissertation, improved methods of measuring physical and mechanical properties of investigated alloys and established patterns of their behavior have practical application in creating technologies for the production of materials for lead-free solders and the ability to purposefully control their structure and properties.
