Search academic texts

Information × Registration Number 0215U003374, 0113U003043 , R & D reports Title Alloys, surfaces and composite materials with a quasicrystalline, micro- and nanocrystalline structure. popup.stage_title Head Bashev Valeriy Fedorovich, Registration Date 28-01-2015 Organization Dniepropetrovsk national university popup.description2 Object of investigation is the rule and phenomena of quasi-crystalline, nano - and microcrystalline state formation in alloys, coatings, composite materials. Purpose of work is creation of new materials with controlled properties, hardened microcrystalline, nano - and quasicrystalline phases to provide enhanced operational stability. Recommendations on the choice of alloy- filler composition for the metal alloys-ligaments of macroheterogeneity composite materials with high tribological characteristics, abrasion, corrosion and scaling resistance were developed. The use of multi-layer composite materials with differ in the metal multi-layer composition, provided of operational resistance under gradient fields of temperature and strain was proposed. Methods of surface alloying of low-carbon, low-alloy steels with boron and carbon in order to obtain the sublayer with globular cementite, borocarbide preventing the cracks formation and increasing strengthy have been developed. The new compositions of powder environments for multicomponent diffusion saturation with boron, W, Mo or boron, Mo, Si, in which the complex coating of modified boride layer and sublayer with multiphase composite structure on steel surface provided in comparison with borosilicium 20-22% greater coating thickness, high hardness and resistance to brittle fracture, less intensity linear wear, increased by 10%, the heat resistance were proposed. It is established the pre-processing steels using at multicomponent saturation leads to the acceleration of diffusion processes, increases the wear resistance of steel in 1.5-2 times. Hardened coating of nanosized particles of refractory phases (borides of titanium) with a high hardness was received on the titanium alloy BT-0 surface. It is revealed the increasing capacity and ductility in the battery alloys under the alternating electric current action was happened at the same time. The degree of grains fragmentation in these alloys under the electric current action is different at any temperatures and for PbCa0.05Sn1.1 alloy is 10% - 14%, and for PbCa0.1 Sn0.3 alloy is 14% - 23%. The cooling rate increasing to 5·105 K/s when Pb alloy with a high content of barium (up to 0.03%) by quenching from the liquid in the production of a supersaturated solid solutions based on Pb and grains fragmentation provides the increase of microhardness by 40% compared with industrial production alloys. The results of the investigation MD showed the increasing of thermal stability of the amorphous state under the current voltage action. The metal and quasicrystalline phases compositions with high electrical resistance and thermal stability and a value of the thermal coefficient of resistance close to zero were obtained in the alloys of the system Al-Cu-Co, Al-Ni-Co , Al-Cu-Cr at high efficient cooling rate (up to 1012-1014K/s). It can be used for a new class of resistance alloys creating. Product Description popup.authors . Спиридонова Ірина Михайлівна Бабічев Валентин Федорович Бутенко Валерій Федорович Дерун Олексій Юрієвич Доценко Федор Федорович Дядьков Андрій Васильович Зінковський Геннадій Валентинович Здоровець Наталія Олександрівна Карпенко Надія Валерієвна Карплюк Людмила Василієвна Костіна Ангеліна Андрїївна Куцева Наталія Олександровна Кушнерьов Олександр Ігоревич. Маякова Алла Іванівна Мостовий Володимир Іванович Піляєва Світлана Борисівна Прохода Олександр Сергійович Рябцев Сергій Іваноаич Сироватко Юлія Володимирівна Скорбященський Євгеній Сергійович Сухова Олена Вікторівна Федіна Галина Петрівна Федоренкова Любов Іванівна Чалий Ігор Іванович popup.nrat_date 2020-04-02 Close