T. P. Tolmachev, V. P. Pilyugin, A. M. Patselov, A. I. Ancharov, A. V. Inozemtsev
MECHANICAL ALLOYING AND FRACTURE FEATURES OF NON-EQUILIBRIUM Cu-Co ALLOYS
DOI: 10.17804/2410-9908.2018.6.018-026 The paper studies the structural, phase and fractographic features of mechanically synthesized non-equilibrium Cu-Co alloys characterized by limited solubility. The components are taken in three different proportions. Mechanical alloying was carried out by high-pressure torsion related to severe plastic deformation methods. As a result of mechanical alloying, the investigated system of components initially insoluble below 800 °C, according to the equilibrium phase diagram, undergoes structural and phase changes consisting in the formation of non-equilibrium solid solutions. With an increase in the proportion of cobalt in the original mixture, the proportion of this element in the solid solution increases after mechanical alloying. This, in turn, affects the appearance of the fracture surface; namely, it changes from brittle-ductile fracture first to brittle fracture and then to mixed one, corresponding to an earlier stage of deformation-induced mechanical alloying.
Acknowledgments: The research was performed within UB RAS Project No. 18-10-2-24. Keywords: mechanical alloying, high-pressure torsion, non-equilibrium solid solution, Cu-Co system, fractography, X-ray diffraction analysis References: 1. Lyakishev N.P., ed. Diagrammy sostoyaniya dvoinykh metallicheskikh sistem [State Diagrams for Double Metal Systems: Reference book]. Moscow, Mashinostroenie Publ., 1997, 1024 p. (In Russian).
2. Miedema A.R., De Chatel P.F., De Boer F.R. Cohesion in alloys – fundamentals of a semi-empirical model. Physica B, 1980, vol. 100, pp. 1–28. DOI: 10.1016/0378-4363(80)90054-6.
3. Barabash O.M., Koval Yu.N. Struktura i svoystva metallov i splavov [Structure and Properties of Metals and Alloys]. Kiev, Naukova Dumka Publ., 1986, 599 p. (In Russian).
4. Tolmachev T.P., Pilyugin V.P., Ancharov A.I., Chernyshov E.G., Patselov A.M. The Formation, Structure, and Properties of the Au–Co Alloys Produced by Severe Plastic Deformation under Pressure. Physics of Metals and Metallography, 2016, vol. 117, no. 2, pp. 135–142. DOI: 10.1134/S0031918X16020125.
5. Starenchenko V.A., Cherepanov D.N., Solov’eva Yu.V., Popov L.E. Generation and accumulation of point defects in fcc single crystals upon plastic strain. Russ. Phys. J., 2009, vol. 52, no. 4, pp. 398–410. DOI: 10.1007/s11182-009-9237-0.
6. Gapontsev V.L., Kondrat’ev V.V. Diffusion phase transformations in nanocrystalline alloys under severe plastic deformation. Dokl. Phys., 2002, vol. 47, no. 8, pp. 576–579. DOI: 10.1134/1.1505513.
7. Farber V.M. Contribution of diffusion processes to structure formation in intense cold plastic deformation of metals. Metal Sci. Heat Treat., 2002, vol. 44, no. 7–8, pp. 317–323. DOI: 10.1023/A:1021216122980.
8. Hirth J.P., Lothe J. Theory of Dislocations, New York, McGraw Hill, 1968, 780 p.
9. Shtremel’ M.A. Participation of diffusion in the processes of mechanical alloying. Metal Sci. Heat Treat., 2002, vol. 44, no. 7–8, pp. 324–327. DOI: 10.1023/A:1021268107050.
10. Oberdorfer B., Setman D., Steyskal E., Hohenwarter A., Sprengel W., Zehetbauer M., Pippan R., Wurschum R. Grain boundary excess volume and defect annealing of copper after high pressure torsion. Acta Mater., 2014, vol. 68, pp. 189–195. DOI: 10.1016/j.actamat.2013.12.036.
11. Popov V.V., Sergeev A.V., Arkhipova N.K., Istomina A.Yu. Determination of the parameters of grain-boundary diffusion and segregation of Co in W using an improved model of grain-boundary diffusion. Phys. Met. Metallogr., 2011, vol. 112, pp. 256–266. DOI: 10.1134/S0031918X11030252.
12. Christian J. The Theory of Transformations in Metals and Alloys. Part 1. Equilibrium and General Kinetic Theory, Oxford, Pergamon, 1975, 586 p.
13. Andrievskii R.A., Glezer A.M. Strength of nanostructures. Phys. Usp., 2009, vol. 52, no. 4, pp. 315–334. DOI: 10.3367/UFNe.0179.200904a.0337.
14. Andrievskii R.A., Glezer A.M. Size effects in nanocrystalline materials. II. Mechanical and physical properties. Phys. Met. Metallogr., 2000, vol. 89, pp. 83–102.
15. Pilyugin V.P., Gapontseva T.M., Chashchukhina T.I., Voronova L.M., Shchinova L.I., Degtyarev M.V. Evolution of the structure and hardness of nickel upon cold and low-temperature deformation under pressure. Phys. Met. Metallogr., 2008, vol. 105, pp. 409–418. DOI: 10.1134/S0031918X08040157.
Article reference
Mechanical Alloying and Fracture Features of Non-Equilibrium Cu-Co Alloys / T. P. Tolmachev, V. P. Pilyugin, A. M. Patselov, A. I. Ancharov, A. V. Inozemtsev // Diagnostics, Resource and Mechanics of materials and structures. -
2018. - Iss. 6. - P. 18-26. - DOI: 10.17804/2410-9908.2018.6.018-026. -
URL: http://eng.dream-journal.org/issues/content/article_235.html (accessed: 12/02/2024).
|