Alexander V. Revutskiy

Dissertation topic

Study of the formation of the structure and properties of technical beryllium and the improvement on this basis of the processes of powder metallurgy

Domestic scientific consultant

Boris V. Syrnev, Doctor of Technical Sciences, Professor. Leading researcher at D. Serikbayev East Kazakhstan technical university. Ust-Kamenogorsk, Kazakhstan.

Hirsch index (3-RSCI; 1-Scopus).

Foreign scientific consultant

Vladimir Y. Lopatin, Candidate of Science (Engineering), Docent. Scientific Secretary of the Department of Powder Metallurgy and Functional Coatings, NUST MISiS. Moscow, Russian Federation.

Hirsch index (5-RSCI; 1-Scopus).

Bast Jurgen, Professor, Mining Academy. Freiberg, Germany.

Hirsch index (3-RSCI; 7-Scopus).

Main scientific results

1. The mechanism of the formation of the reinforcing phase in sintered beryllium has been proposed and substantiated as a result of devitrification of the amorphous beryllium oxide film on the surface of beryllium grains and the formation of discrete strengthening crystalline oxide particles.

2. The influence of impurities on the process of devitrification of beryllium oxide has been established, which determines a homogeneous or heterogeneous mechanism for the formation of crystalline beryllium oxide, which in turn determines the strengthening effect of the reinforcing phase.

3. A numerical dependence of the influence of the structure parameters and modes of powder consolidation on the strength properties of sintered beryllium has been developed, which makes it possible to predict and control the mechanical properties of beryllium, in particular, the precision limit of elasticity.

Direct result

1. The process of degradation of the beryllium oxide film has been investigated. It was found that the formation of beryllium oxide particles is a consequence of the transition of amorphous beryllium oxide to a crystalline state - devitrification. The mechanisms of homogeneous and heterogeneous devitrification were determined according to the principle of the content of secondary phases.

2. The influence of the morphology of the reinforcing phase on the precision property of sintered beryllium has been investigated. The influence of the mechanism of "dispersed-grain-boundary" hardening in dependences on the grain size, content and ratio of secondary phases, in predicting the strength properties of hot-pressed beryllium of the TGP-56 brand, has been determined.

3. The effect of hardening of beryllium sintered by the HIP method was investigated, the dependence of the strength characteristics of beryllium products depending on the temperature of consolidation of powders was established, reflecting the regularities of hardening of polycrystalline beryllium by a mechanism that is a superposition of two mechanisms: grain boundary and dispersed hardening.

4. The greatest degree of influence of the temperature regime of consolidation and, as a consequence of the size of the particles of the strengthening phase, on the precision limit of elasticity and conditional yield stress of sintered beryllium has been established.

Scientific works

Articles in journals recommended by the Education and Science Oversight Committee:

  • Revutskiy A.V., Syrnev B.V., Semilutskaya O.V. Influence of the technological regulations of the vacuum hot pressing process on the quality of sintered beryllium. Vestnik of D.Serikbaev EKTU, Issue No. 1 (87), March 2020;
  • Revutskiy A.V., Syrnev B.V., Semilutskaya O.V. Study of the formation of a reinforcing phase at the grain boundaries of sintered beryllium. Proceedings of universities. Powder metallurgy and functional coatings. 2020, No. 3 (not included in the list of KKSON journals);
  • A.V. Revutsky, B.V. Syrnev, V.Yu. Lopatin, O.V. Semilutskaya, T.A. Segeda. Research of reinforcement phase formation on the borders of sintered beryllium grains. Russian Journal of Non-Ferrous Metals. 2021 №1.

The Hirsch index

 

-

Funded research projects

-

Level of foreign language proficiency

Intermediate