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Yernat A. Kozhakhmetov |
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Dissertation topic |
Change in the structural-phase state of a sorption-active material based on the Ti-Al-Nb system during thermal cyclic sorption |
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Domestic scientific consultant |
Mazhyn K. Skakov, Doctor of Physical and Mathematical Sciences, Professor, Academician of KazNAEN, Chief Researcher of NNC RK. Scopus Author ID: 6506859122, Hirsch index 7. |
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Foreign scientific consultant |
Wojciech Kazimierz Wieleba, Prof., DSc, Eng., Wrocław University of Science and Technology, Wroclaw, Poland. Scopus Author ID: 6506015512, Hirsch index 5. |
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Main scientific results |
1. Calculations of the composition of the initial components of the material based on the Ti-Al-Nb system have been carried out; the granulometric parameters of the initial powders were determined; methods of solid-phase mechanochemical synthesis have been developed. Based on the data obtained, a mechanochemical synthesis of a powder mixture based on the Ti-Al-Nb system was carried out, which makes it possible to obtain compacted materials with a bimodal (B2 + O) structure. 2. With the help of X-ray phase analysis and electron microscopic studies, the features of the evolution of the structural-phase state of the alloy based on the Ti-Al-Nb system have been established, depending on the parameters of mechanoactivation treatment and spark plasma sintering. On the basis of the data obtained, the optimal conditions for the synthesis of bimodal compacted materials based on the Ti-Al-Nb system with a high range of performance properties were determined, incl. with improved hydrogen sorption properties. 3. The results of the influence of thermocyclic hydrogenation / dehydrogenation processes on the sorption capacity and structural-phase state of getter-phase materials based on the Ti-Al-Nb system have been obtained. 4. On the basis of the data obtained, practical recommendations were given for the application of the technology of obtaining hydrogen-storage material based on the Ti-Al-Nb system. |
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Direct result |
On the basis of the developed method of solid-phase mechanochemical synthesis of materials based on the Ti-Al-Nb system, a patent for a useful model "Method for producing hydrogen-accumulating rechargeable ICs" was obtained. Kozhakhmetov Ye.A., Batyrbekov E.G., Skakov M.K., Kurbanbekov Sh.R., Mukhamedzhanova R.M., Mukhamedova N.M. - No.5809 dated January 29, 2021. |
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Scientific works |
1. Kozhakhmetov Ye., Skakov M., Wieleba W., Kurbanbekov Sh., Mukhamedova N. Evolution of intermetallic compounds in Ti-Al-Nb system by the action of mechanoactivation and spark plasma sintering. AIMS Materials Science Vol. 2, 2020. - Р. 182-191. DOI: 10.3934/matersci.2020.2.182. (Indexed by ISI Web of Science and Scopus, quartile Q3, percentile in Scopus 45%). 2. Kozhakhmetov Ye., Skakov M., Mukhamedova N., Kurbanbekov Sh., Ramankulov Sh., Wieleba W. Changes in the microstructural state of Ti-Al-Nb-based alloys depending on the temperature cycle during spark plasma sintering. Materials Testing Vol. 63, №2, 2021. – P. 119-123. DOI: 10.1515/mt-2020-0017. (Indexed by ISI Web of Science and Scopus, quartile Q3, percentile in Scopus 36%). 3. Kozhakhmetov Ye.А., Skakov М.K., Kurbanbekov Sh.R., Mukhamedov N.M., Mukhamedov N.Ye. Powder Composition Structurization of the Ti-25Al-25Nb (at. %) System upon Mechanical Activation and Subsequent Spark Plasma Sintering. Eurasian Chemico-Technological Journal V. 23, 2021 – P.37‒44. DOI: 10.18321/ectj1032. (Indexed by ISI Web of Science and Scopus, quartile Q3, percentile in Scopus 24%). Recommended CCES RK. 4. Kozhakhmetov Ye.A., Skakov M.K., Kurbanbekov SH.R., Mukhamedova N.M., Vodorodakkumuliruyushchiye perezaryazhayemyye intermetallicheskiye soyedineniya na osnove sistemy Ti-Al-Nb, Vestnik Satbayev University Volume 134, No. 4, 2019, - P. 455-459. ISSN1680-9211. https://vestnik.satbayev.university/index.php/journal/issue/view/47/46. Recommended by KKSON RK. 5. Mukhamedova N.M., Kozhakhmetov Ye.A., Skakov M.K., Mukhamedzhanova R.M, Kurbanbekov SH.R., Vliyaniye mekhanoaktivatsii na obrazovaniye ortorombicheskoy fazy v sisteme Ti-Al-Nb, Vestnik Satbayev University Volume 135, No. 5, 2019. - P. 115-120. ISSN1680-9211. https://vestnik.satbayev.university/index.php/journal/issue/view/48/47. Recommended by CCES RK. |
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The Hirsch index |
Scopus ID: 57221911547. ORCID ID: https://orcid.org/0000-0002-6778-1898. |
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Funded research projects |
1. Scientific and technical program "Development of nuclear energy in the Republic of Kazakhstan for 2021-2023" on the topic "Research of promising materials based on the Ti-Al-Nb system for storing and transporting hydrogen" Assignment (code: 02.04) - Topic leader. 2. Scientific and technical program "Development of nuclear energy in the Republic of Kazakhstan for 2021-2023" on the topic "Investigation of the influence of various temperature and time parameters of heat treatment on the formation of a complex of properties of alloys based on orthorhombic titanium aluminide" Assignment (code: 02.02) - Topic leader. |
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Level of foreign language proficiency |
