Current projects:

ІІІ-36-21-708 «Development of scientific methods for managing the processes of structure formation and properties in castings from hypereutectic aluminum-silicon alloys».

 

 

The most significant achievements in scientific and practical activities

- extended understanding of patterns and mechanisms of formation of non-dendritic morphology of primary aluminum crystals in industrial foundry and deformed alloys;

- scientific and practical problems of increasing physical and mechanical characteristics are solved by the technology of rheo- and thixocasting, properties of aluminum castings to increased: strength by 25...35%, plasticity - by 6...8 times;

- developed an original method of controlling the macro-, microstructure and mechanical properties of cast products from a wide range of cast aluminum alloys using a vibrating crystallizer immersed under the melt mirror through the open surface of the mold with low thermophysical characteristics. This made it possible to achieve grinding of the crystal structure by 10 times, to increase strength by 25%, and plasticity by 8 times;

-  the scientific and technological principles of obtaining complex modifying ligatures of complex and direct action on the processes of structure formation and formation of properties in aluminum alloys have been developed;

-         researched regularities of structure formation, changes in phase composition, morphology of iron-containing phases, and physical and mechanical properties of alloys of the Al-Si system after processing them in the liquid state with unipolar pulsed electric current;

- the influence of rational regimes of saturation of the melt with hydrogen on the micro- and macrostructure of castings from aluminum alloys, the distribution of gas-shrinkage defects, as well as on their tightness, strength and plasticity.

 

 

Promising developments

Conducting of scientific research and development of industrial technologies at the modern technical level, the department has promising developments (experimental base, unique research methods, equipments and accessories, most of which are original and developed at the department):

- the complex industrial and laboratory melting equipment;

-; equipment for studying the effect of all-sided and one-sided pressure (up to 0.5 MPa) on the casting which crystallization;

- equipments and methods for researching  on shock loading on the structure and properties of castings;

- equipments and methods of modeling and research of melt flows during processing of melt by stirring according to established speed and temperature;

- equipments and methods for processing the alloy in the liquid and liquid-solid states by vibration with a given frequency and temperature;

- a device for rotary processing of the melt in order to obtain a non-dendritic structure (Patent UA № 85981, 2009);

- equipments for processing alloy in liquid and liquid-solid states with electric current with the possibility of changing the current density and frequency within wide limits (UA Patent No. 101208, 2013, UA Patent No. 111308, 2016);

- upgrade equipments and research methods of the crystallization process by the method of thermal analysis;

- device and method of researching the sequence, nature of phase transformations and morphology of phases during crystallization depending on the physical and chemical effects on the melt (UA Patents No. 123741, 124431);

- equipment and methods of obtaining materials in amorphous, nanostructured and fine crystalline states;

- devices for processing metals and alloys with high-temperature plasma, vacuum spraying;

- equipment and methods of metallographic research, measurement of microhardness of phases;

- equipment and methods of physical modeling of solidification and melting processes on transparent substances;

- equipment for determining the hydrogen content in the melt (A.S. No. 1528613, A.S. No. 1651157);

            equipment and methodology process of the feeding of casting (A.S. No. 1678520);

- the method of researching the processes of hydrogen distribution in the casting according to the density of the corresponding samples;

- equipment for determining the density of the material by the method of hydrostatic weighing, the fluidity of the melt by the vacuum method absorption;

- devices and methods for studying the propensity of the melt to form internal and external, concentrated and scattered shrinkage defects in the conditions of an unimpregnated casting, determining the crack resistance of castings, researching the process of feeding a casting;

- equipment for heat treatment of metals and alloys.

          The use of developed and improved research methods and equipment made it possible to develop:

- modern technologies and low-pressure casting machines (ALUG-3, 83105), the serial production of which was carried out at the Tiraspil Casting Machine Plant;

          - fundamental and practical principles of obtaining castings from aluminum alloys by rheo- and thixocasting methods with an increased level of properties, which have been tested in the conditions of industrial production;

          - technologies of neutralization of the harmful effects of iron and modification of industrial silumins by treating the melt with electric current, which made it possible to widely use scrap and waste in the production process with the obtaining of mechanical properties at the level of alloys smelted from primary metals, as well as to obtain a significant economic effect due to the reduction of costs for raw materials and energy resources;

          - methods of increasing the crack resistance of high-strength aluminum alloys using physical and chemical effects on the melt, which is one of the main problems in the production of deformable aluminum alloy products;

          - technologies  of modification aluminum alloys, based on the principle of structural inheritance, in particular by rapidly cooled ligatures, and the introduction of modifiers into the plasma flow;

          - theoretical and practical bases of modification of primary silicon crystals in hypereutectic silumins by treating the melt with a unipolar pulsed electric current with a periodic (cyclic) change in frequency. As a result of such influence, during hardening at a rate of 0.3 K/s, the release of primary silicon crystals is suppressed. The plastic properties of a brittle aluminum alloy with a silicon content of 15-18 wt.% correspond to aluminum series A0.

- economically alloyed nickel-free piston hypereutectic aluminum-silicon alloy of type AlSi16Fe, in which Ni is replaced by Fe. This makes it possible to use aluminum scrap with a high iron content in its production, to obtain mechanical properties at the level of piston alloy Al12Cu2MgNi with a lower coefficient of linear expansion. At the same time, for each percent reduction in nickel content, depending on the quality of nickel-containing raw materials, the additional savings will be from UAH 4,000 to UAH 7,000. for 1 ton of alloy.

 

 

Publications

Monographs:

Tuboltsev L.G., Prygunova A.G., Narivskyi A.V., Petrenko V. Concept of sustainable development of metallurgy of Ukraine. Condition, experience, prospects. – Dnipro – 2023. – 364 p. https://doi.org/10.52150/ISBN-978-966-02-9926-9 ISBN: 978-966-02-9926-9 3.

Patents of Ukraine:

1. Patent UA No. 85981. Method of thixocasting. Publ. 03/10/2009. Bul. №5.

2. Patent for the invention UA No. 111308. The method of modification of alloys by electric current. Publ. 04/11/2016. Bul. №7.

3. Patent for invention UA  No. 124431. Method of investigation of phase transformations and morphology of phases in the process of crystallization. Publ. 09/15/2021. Bul. №37.

4. Patent for the invention No. 123266, Ukraine. Method of modification of pre-eutectic aluminum-silicon alloys. Publ. 03/24/2021. Bul. №13.

5. Patent for the invention UA 123741, Ukraine. A device for studying phase transformations and morphology of phases in the crystallization process. Publ. 05/26/2021. Bul. №21.

Articles in international databases Scopus / Web of Science:

             1. A. G. Borysov, Tsir T. G. Some Modern Methods of Improving the Properties of Hypereutectic Al–Si alloys. Metallofiz. Noveishie Tekhnol. 2023. 45. No. 1. pp. 95–110. DOI: 10.15407/mfint.45.01.0095

2. Prigunova A.G., Shcheretskiy O.A., Koshelev M.V., Babuk V.D., Zhidkov E.A. Thermodynamic Modelling and Thermal Analysis of AK5M2 Alloy with 0.8–3.3% Iron. Metallofiz. Noveishie Tekhnol. 2022. - 44, No. 5. pp. 671–689 DOI: 10.15407/mfint.44.05.0671

3.  Prigunova A.G. Koshelev M.V. Borisov A.G. Effect of unipolar pulsed electric current treatment of the melt of Al – 8 wt-% Si – 0.7 wt-% Fe alloy on iron-containing phases formation and mechanical properties of castings. Materials Science and Technology. - 2022. - Vol. 38. – pp. 246-253. https://doi.org/10.1080/02670836.2022.2037059 

4. Prigunova A.G. Belik V.I. Shenevidko L.K. Koshelev M.V. Prigunov S.V. High-Speed Quenching from Liquid-Solid State as Method for Studying Phase Transformations at Crystallization. Metallofizika i noveishie tekhnologii. - 2022. - Vol. 44. – No 2. – pp. 191-209. https://doi.org/10.15407/mfint.44.02.0191

5. Prigunova A.G., Zelinskaya G.M., Koshelev M.V. The effect of melt processing by unipolar pulsed electric current on formation of iron-containing phases in AK5M2 alloy. Metallofiz. Noveishie Tekhnol. 2019. 41, No. 5: pp. 655-672. https://doi.org/10.15407/mfint.41.05.0571.  

6.   Borisov A.G., Sheigam V.Yu. Investigation of the possibility of the formation of a splitting morphology under conditions of large concentration gradients. Metallofiz. Noveishie Tekhnol., 39, No. 10:1411-1422 (2017)

7. Prigunova A.G., Petrov S.S., Prigunov S.V., Klyuchnik D.М. Modification of hypoeutectic silumins by processing the melt with pulsed electric current. Metallofiz. Noveishie Tekhnol., 2015. - 37(3), pp. 383-394.

8. Borisov, A.G., Tarasevich N.I., Korinets I.V., Semenchenko A.I. Predicting type of morphology of primary phase in aluminum alloy castings produced in a thin-walled metal mold. The physics of Metals and Metallography, 2013, vol. 114, No. 3, p.p. 242-245.

9. Borysov A. G. Investigation of the influence of melt stirring on the formation of macro- and microstructures. Metallofiz. Noveishie Tekhnol., 2014, 36(1), pp. 127-137.

 

Articles:

1. Belik V.I., Prigunova A.G., Sheyham V.Y., Vernydub A.G. Physico-chemical methods of increasing the crack resistance of AK4.5Kd alloy (VAL10). Message 1. Experience of using ring sample. Casting processes. - 2023. - № 2 (152). - pp. 24-32. https://doi.org/10.15407/plit2023. 02.024  

2. Prigunova A.H., Zhydkov E.A., Babyuk V.D. The structure, phase composition, and properties of the AK12M2MgN alloy with an increased iron content treated in the liquid state with an electric current. Metal Science and Treatment of Metals. – 2023. – t. 29 (106) - № 2. – pp. 3-14. https://doi.org/10.15407/mom2023.02.003

 3. Prigunova A.G., Zhydkov E.A., Babyuk V.D., Borysov A.G., Shenevidko L.K. The influence of the cooling rate on the structure formation of the AM4.5Kd alloy (VAL10). Metal Science and Treatment of Metals. - 2022. - № 1. – pp. 29 – 372. https://doi.org/10.15407/mon.2022.01/029

 4. Prigunova A.G., Zhydkov E.A., Babyuk V.D., Shenevidko L.K., Tsir T.G. Management of the structure and properties of cast aluminum alloy AM4.5Kd (VAL10) by modification with fine crystal ligatures. Metal Science and Treatment of Metals. – 2022. – t. 28 (103). -№ 3. – pp. 3-17. https://doi.org/10.15407/mom2022.03.0032

5. Sheyham V.Y., Prigunova A. G., Koshelyev M.V., Nuradynov A.S., Duka V.M., Shenevidko L.K., Vernydub A. G. Management of the casting structure through the open the surface of the overflow. Casting processes. - 2021. - № 4. - pp.30-42. DOI: 10.15407/plit2021.04.030

6. Holovachenko V.P. Shenevidʹko L.K. Isaycheva N.P. Duka V.M. Tsir T. G. Vernydub A. G. Peculiarities of rotary processing of aluminum alloys in ladles in rheo- and thixocasting processes. Casting processes. - 2020. - №4. - pp. 3-12.

7. Belik V.I., Prigunova  A. G., Semenchenko A.Y., Duka V.M., Tsir. T. G. Efficiency of fast-cooled Al5Ti ligature under conditions of direct thermal rheocasting method. Casting processes. - 2018. - № 4 (130).- pp. 3-11

 8. Prigunova  A. G., Holovachenko V.P., Tytov V.A., Nohovytsyn A.V., Koshelev M.V., Tsir. T. G. Influence of complex effects on the formation of the structure and thixotropic properties of cast high-strength aluminum alloys V95 and D16. Casting processes. - 2018.- № 3 (129). -pp. 14-22.

9. Belik V. I., Tsir. T. G. The role of the factor stirring of the melt under the conditions of the direct thermal method (DTM). Casting processes. - 2018, №5 (131). - pp. 7-17.

10. Borysov A. G., Sheyham V.Y, Duka V. M., Vernydub A. G., Tsir T. G. Direct thermal method for rheocasting of alloys based on zinc and copper. Casting processes. - 2017. - №5. - pp. 25-29.