4_2020_sen_11

Title of the article

ENERGY STATE ESTIMATION OF MECHANOCOMPOSITES CONTAINING FUSIBLE COMPONENTS BASED ON ANALYSIS OF FINE STRUCTURE PARAMETERS AND THERMAL EFFECTS
Authors

ZHORNIK Viktor I., D. Sc. in Eng., Prof., Head of the Department of Mechanical Engineering and Metallurgy — Head of the Laboratory of Nanostructured and Superhard Materials, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

KOVALIOVA Svetlana A., Senior Researcher, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.
In the section MECHANICAL ENGINEERING MATERIALS AND TECHNOLOGIES
Year 2020 Issue 4 Pages 77–84
Type of article RAR Index UDK 621.762.2 Index BBK  
DOI https://doi.org/10.46864/1995-0470-2020-4-53-77-84
Abstract Energy state of composites obtained by mechanical alloying of the Cu-Sn and Fe-Ga powder mixtures during high-energy processing in the planetary ball mill is evaluated by the methods of X-ray diffraction analysis (XRD) and differential scanning calorimetry (DSC). It is shown that during mechanical alloying the total amount of accumulated energy can reach 80 % of the composite melting enthalpy. The greatest contribution to the structuralphase transformations is made by the phase changes of elastic deformations and grain boundaries. The obtained XRD data are consistent with the DSC data. Three endothermic effects are established at temperatures of 507, 792 and 905–1085 °C for the mechanocomposite with the composition Cu20Sn, the value of these thermal effects is significantly reduced (to 0.79, 16.29 and 36 J/g, respectively) relative to an alloy of similar composition obtained by metallurgical methods. The following criteria of estimation of the most probable processes of structural-phase transformations are proposed based on the energy state of mechanocomposites: the structure of the composite is activated at ΔEε << ΔEs; new phases (solid solutions, intermetallic compounds) are formed at ΔEε ≈ ΔEs; the structure ordering processes take place at ΔEε > ΔEs. The decrease in the values of the energy of elastic deformations ΔEε during prolonged mechanical alloying may indicate the increase of the role of the diffusion processes and the formation of ordered structures, which will contribute to the increase of thermal stability of the grain boundaries. According to these criteria, the dose of the introduced mechanical energy to obtain hardened mechanocomposites of the Cu-Sn composition is to meet the conditions: D ≥ 3.4 kJ/g for Cu-Sn mechanocomposites; D ≥ 37.8 kJ/g for Fe-Ga mechanocomposites.
Keywords

mechanocomposites, mechanical alloying, energy state, differential scanning calorimetry, X-ray diffraction analysis, bronze, structural-phase transformations, thermal stability
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Bibliography
  1. Avvakumov E.G. Mekhanicheskie metody aktivatsii khimicheskikh protsessov [Mechanical methods of activation of chemical processes]. Novosibirsk, Nauka Publ., 1986. 302 p. (in Russ.).
  2. Ancharov A.I. Mekhanokompozity — prekursory dlya sozdaniya materialov s novymi svoystvami [Mechanocomposites — precursors for creation of materials with new properties]. Novosibirsk, SO RAN Publ., 2010. 424 p. (in Russ.).
  3. Bakker H., Zhou G.F., Yang H. Mechanically driven disorder and phase transformations in alloys. Progress in materials science, 1995, vol. 39, pр. 159–241.
  4. Rusanov A.I. Termodinamicheskie osnovy mekhanokhimii [Thermodynamic foundations of mechanochemistry]. Moscow, Nauka Publ., 2006. 224 p. (in Russ.).
  5. Bogatyreva E.V., Ermilov A.G., Khokhlova O.V. Prognozirovanie effektivnosti predvaritelnoy mekhanoaktivatsii loparitovogo kontsentrata s primeneniem rentgenostrukturnogo analiza [Predicting the effectiveness of preliminary mechanical activation of loparite concentrate using X-ray diffraction analysis]. Fiziko-tekhnicheskie problemy razrabotki poleznykh iskopaemykh, 2013, no. 4, pp. 166–172 (in Russ.).
  6. Kovaliova S.A., Zhornik V.I., Vityaz P.A. Primenenie rentgenostrukturnogo analiza dlya otsenki energeticheskogo sostoyaniya mekhanokompozitov na osnove zheleza i medi [Application of X-ray diffraction analysis to assess the energy state of mechanocomposites based on iron and copper]. Powder metallurgy. Surface engineering, new powder composite materials. Welding, 2019, pp. 498–515 (in Russ.).
  7. Martynyuk M.M. Rol ispareniya i kipeniya zhidkogo metalla v protsesse vzryva provodnikov [Role of evaporation and boiling of liquid metal in the explosion of conductors]. Zhurnal tekhnicheskoy fiziki, 1974, vol. 44, no. 6, pp. 1262–1270 (in Russ.).
  8. Vertman A.A., Samarin A.M. Stroenie i svoystva zhidkikh metallov [Structure and properties of liquid metals]. Moscow, AN SSSR Publ., 1960. 350 p. (in Russ.).
  9. Balzar D., Ledbetter H. Voigt-function modeling in Fourier analysis of size- and strain-broadened X-ray diffraction peaks. Journal of applied crystallography, 1993, vol. 26, iss. 1, pр. 97–103. DOI: https://doi.org/10.1107/S0021889892008987.
  10. Alekseev D.B., Saletskii A.M., Stepanyuk O.V. Protsessy plavleniya nanoklasterov Cu na poverkhnosti medi (100) [Melting of copper nanoclusters on a (100) copper surface]. Vestnik Moskovskogo universiteta. Seriya 3. Fizika. Astronomiya, 2008, no. 2, pp. 54–57 (in Russ.).
  11. Kovba L.M., Trunov V.K. Rentgenofazovyy analiz [X-ray phase analysis]. Moscow, Moskovskiy gosudarstvennyy universitet Publ., 1976. 232 p. (in Russ.).
  12. Vityaz P.A., Kovaliova S.A., Kiseleva T.Yu., Grigorieva T.F. Kinetika fazoobrazovaniya poroshkovykh kompozitov sistema Fe–Ga pri mekhanokhimicheskom splavlenii [Kinetics of phase formation of powdered composites of Fe–Ga during mechanоchemical alloying]. Proceedings of the National Academy of Sciences of Belarus. Physical-technical series, 2012, no. 1, pp. 5–11 (in Russ.).
  13. Vityaz P.A., Zhornik V.I., Kovaliova S.A., Grigorieva T.F. Vliyanie rezhimov mekhanoaktivatsii na strukturu i svoystva poroshkovprekursorov sistemy “med – olovo” i splavov, spechennykh na ikh osnove [Effect of mechanical activation modes on the structure and properties of precursor powders of the “copper – tin” system and alloys sintered on their basis]. Vestnik of Vitebsk State Technological University, 2014, no. 1(26), pp. 110–120 (in Russ.).
  14. Ilin A.P. Diagnostika nanoporoshkov i nanomaterialov [Diagnostics of nanopowders and nanomaterials]. Tomsk, Tomskogo politekhnicheskogo universiteta Publ., 2008. 249 p. (in Russ.).
  15. Asanova D.S., Gusakova (Shlyapkina) N.S., Vasilyev A.S., Popov N.A. Issledovaniya svoystv poroshka bronzy s primeneniem metoda differentsialnoy skaniruyushchey kalorimetrii (DSK) [Investigate properties powder of bronze with use method of differential scanning calorimetry (DSC)]. Materialy 18 Mezhdunarodnoy nauchno-tekhnicheskoy konferentsii “Uralskaya shkola-seminar metallovedov — molodykh uchenykh” [Proc. 18th
    International scientific-technical conference “The Ural schoolseminar of metal scientists — young researchers»]. Yekaterinburg, 2017, pp. 161–165 (in Russ.).
  16. Furtauer S., Li D., Cupid D., Flandorfer H. The Cu-Sn phase diagram, Part I: New experimental results. Intermetallics, 2013, vol. 34, pр. 142–147.
  17. Stockdale D. The alphaphase boundary in the coppertin system. Journal of the Institute of Metals, 1925, vol. 34, pр. 111–124.