Three types of aluminum alloys such as AlSi7Mg, AlSi12Cu2MgNi and AlZn4 are refined by introducing nanoparticles of high melting temperature compoundsnitrides and carbides as well as diamonds in the melt. Their influence on microstructure, mechanical and some electrochemical properties of castings of these alloys is investigated. It is established that the microstructure is refined, the porosity is decreased, and some mechanical and electrochemical properties such as protection potential in drinking water are increased. The mechanism of grain refinement and silicon modification is discussed.
The influence of nanopowders on the structure and mechanical properties was investigated in castings of aluminium alloy AlSi7Mg, grey cast irons GG15 and GG25 and steel GX120Mn12. Mixtures of SiC, TiCN and Y2O3 nanopowders were used. These mixtures or nanocompositions were coated with Cu, Cr, Ni and Fe metal protectors in order to improve wetting of the metal melt. Introducing small amounts of nanocompositions (less than 0.1 wt%) into the melt was found to refine the microstructure and improve the mechanical properties of the castings.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.