Персона: Морохов, Павел Владимирович
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Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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- ПубликацияТолько метаданныеEFFECT OF BERYLLIUM ON THE MORPHOLOGY OF INITIAL INGOTS AND THE STRUCTURAL PHASE STATE OF FAST-QUENCHED STEMET 1108 BRAZING ALLOY RIBBONS(2022) Bachurina, D. M.; Morokhov, P. V.; Rasskazov, R. S.; Sevryukov, O. N.; Kalin, B. A.; Морохов, Павел Владимирович; Севрюков, Олег НиколаевичThe STEMET 1108 grade (copper – tin – indium – nickel) of filler metal is currently used to braze bronze to tungsten plated with pure copper in divertors of the International Thermonuclear Experimental Reactor (or, ITER). Such filler metals are obtained as a result of rapid solidification of melt on a rapidly spinning copper wheel (melt spinning). When ingots are cast from which brazing ribbons are further produced, pores occur in them, through which indium evaporates. All this may affect the quality of the final product. The authors propose to alloy ingots with beryllium to stop the pore formation. This paper looks at the effect of beryllium on the quality of filler metal ingots and ribbons. The paper describes the results of a study that looked at the structural phase state of filler metals using electron microscopy and X-ray diffraction techniques, as well as a synchrotron radiation source. Both ingots and ribbons were found to have the same phase composition that consists of copper-based FCC-solid solutions and contains phosphide Cu3P. Beryllium containing ribbons are thinner than beryllium-free ribbons. In both cases, a dendritic structure is formed across the entire ribbon thickness. It is demonstrated that beryllium alloying in the range of 0.05 to 0.1 wt. % helps to significantly reduce the porosity of the initial ingots without compromising their structural phase state. In addition, it helps prevent the evaporation of indium. Hence, the difference in the structural phase state between beryllium alloyed and non-alloyed ribbons is insignificant and only concerns their dendritic structure, while there is no noticeable difference in their phase composition. © 2022, Ore and Metals Publishing house. All rights reserved.
- ПубликацияТолько метаданныеMicrostructure formation and mechanical properties of isothermally-solidified titanium alloy joints brazed by a Ti - Zr - Cu - Ni - Be amorphous alloy foil(2020) Morokhov, P. V.; Ivannikov, А. A.; Popov, N. S.; Sevryukov, O. N.; Морохов, Павел Владимирович; Иванников, Александр Александрович; Попов, Никита Сергеевич; Севрюков, Олег НиколаевичTwo titanium alloys, OT4 and VT6-c, with a pseudo-alpha and alpha + beta structure, respectively, were brazed using transient liquid phase (TLP) bonding. To obtain high strength joints an amorphous foil (Ti - 12Zr - 22Cu - 12Ni - 1.5 Be - 0.8V wt.%) was used. Based on microstructural studies and analysis of two- and three-component phase diagrams, the mechanism of the microstructural evolution of the brazed seams of titanium alloys OT4 and VT6-c is described. Brazing at 800 oC with exposure for 0.5 h leads to the formation of a heterogeneous structure consisting of Widmanstatten, eutectoid, and eutectic. Brazed OT4 and VT6-c joints with the presence of a eutectic layer in the centre show low mechanical properties; their ultimate strength lies in a range from 200 to 550 MPa. Increasing the brazing temperature to 840 degrees C and the exposure time to 2 h, leads to the disappearance of the brittle eutectic component from the seam. This structure typically consists of Widmanstatten with a small number of eutectoid fractions. Joints with the absence of a eutectic layer in the brazed seam demonstrate a strength equal to the base titanium alloys. In this case, failure occurs in the base metal. For brazed samples from the OT4 alloy, the tensile strength value is sigma(b) = 750 +/- 3 MPa, and for samples from VT6- c, sigma(b) = 905 +/- 3 MPa.
- ПубликацияОткрытый доступImpact of manufacturing method on the properties of bulk amorphous Zr35Ti30Be27.5Cu7.5 alloy(2025) Suchkov, A. N.; Bazdnikina, E. A.; Morokhov, P. V.; Gorbunov, D. S.; Popova, K. A.; Petrovskiy, V. N.; Ovsyankin, I. R.; Kozlov, I. V.; Sevryukov, O. N.; Севрюков, Олег Николаевич; Овсянкин, Иван Романович; Морохов, Павел Владимирович; Баздникина, Екатерина Александровна; Козлов, Илья Владимирович; Горбунов, Дмитрий Сергеевич; Попова, Ксения Андреевна; Сучков, Алексей Николаевич; Петровский, Виктор НиколаевичZirconium-based bulk metallic glasses, such as Zr35Ti30Be27.5Cu7.5, exhibit outstanding strength, elasticity, and corrosion resistance, making them highly attractive for advanced engineering applications. However, producing bulk amorphous components remains challenging due to the high cooling rates required to prevent crystallization. In this study, Zr35Ti30Be27.5Cu7.5 alloys were fabricated using casting, joining sheet materials, direct energy deposition, and powder bed fusion. Comparative analysis of their structure, phase composition, density, and mechanical properties revealed the main features of the methods used. Castings suffer from structural inhomogeneities and lower density due to insufficient cooling in the ingot center, as well as defects. Joining sheet materials produces small, homogeneous amorphous regions (10 mm) with high amorphism and density; however, non-uniform crystallite distribution reduces mechanical properties. Powder bed fusion emerges as the optimal technology for producing high-quality, high-strength, and high-density Zr-based bulk metallic glass components, outperforming other methods in both material properties and manufacturing precision. Optimal conditions were identified, providing a pathway for scalable manufacturing of Zr-based bulk amorphous metallic alloys with superior properties.