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.
In this article, dealing with robotics is defined as a factor driving the development of preschool children. What was created by science fiction writers has become a natural space for the child. Children do not know a world where there are no drones, smart phones, and computers. Robotics is becoming one of the leading activities for children, which determines the development of creativity, initiative, and independence. Joint design acts as a team work environment where children learn to agree on a project topic, discuss problems in its implementation, look for information from different sources, and use digital technologies. However, immersing a child into the world of robotics can isolate him from the society; immerse him into the virtual world. “Digital flashing” of a child‟s brain can affect its cognitive methods, affecting the neural mechanisms responsible for communicating with other people. This problem is being studied by scientists from around the world. Today the world is doubling - life in two spaces - material, objective and virtual, ideal. That is why the determination of the common ground for these worlds determines the harmonization of the children development in modern space. One of this common ground could be robotics classes. In preschool education, the development of technical creativity occurs through the designers of LegoEdu. The logic of designing cognitive-research activities of children is presented.
Introduction. The hypereutectic aluminium-silicon alloy AlSi18 has been modified by: a standard P modifier, introduced into the melt by means of the ligature CuP 0,4wt.%; a nanomodifier SiC 0,1wt.%; and a combination of these two. The influence of the different types of modifiers and their combination on the mechanical propertis of the alloy has been discussed. The mechanical properties of an unmodified AlSi18 alloy have been used as basic data to compare the obtained results with.
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