PSI - Issue 30

Available online at www.sciencedirect.com Available online at www.sciencedirect.com Sci nceD rect Structural Integrity Procedia 00 (2020) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2020) 000–000

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Procedia Structural Integrity 30 (2020) 136–143

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors The introduction of a small amount of hardeners and reinforcing additives can improve the mechanical and operational properties of materials. Hardening of such materials is to create a structure that impedes the movement of dislocations. It has been determined that the most optimal hardener for composite materials from copper and its alloys can be carbon and, in particular, diamond, as its least chemically active and thermally stable form and, according to the criterion of thermodynamic equilibrium - Gibbs energy. An important advantage in using diamond as a hardener is that diamond has a high adsorption capacity and is the least chemically active among various forms of carbon. The high adsorption capacity of diamond can have a positive effect on the composite material obtained by powder metallurgy methods by sintering together with a metal by absorbing gases that are present in the process. In addition, the ultrafine particles and the nano range are characterized by high surface activity, allowing for a strong adhesion to the matrix. The article examines the effect of ultrafine powders of natural diamond, used as fillers, on the properties of a composite material made of tin bronze, depending on the percentage and grain size. There were made metallographic studies of the surface of the samples. The studies were carried out using the theories of grain-boundary and dispersion mechanisms of hardening. According to the results of metallographic studies, calculations of the quantitative indicators of hardening were carried out using the Orowan and Hall – Petch equations. It was revealed that the introduction of fillers into the composition of the composite in a certain amount has a positive effect on the physic and mechanical properties. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors Keywords: bond; metall matrix; composite; hardener; ultrafine particles; hardening mechanisms. The introduction of a small amount of hardeners and reinforcing additives can improve the mechanical and operational properties of materials. Hardening of such materials is to create a structure that impedes th mov me t of disl cations. It has be n determined that the most ptimal hard ner for c mposite ma erials from cop r and its alloys can be carb n and, in particular, iamond, as its least chemically active a d thermally stable form and, according to the criterion of th rmody amic equilibri m - Gibbs energy. An important dv n ag i using diamond as a hardener is that diamond has a high adsorption capacity and s the least chemically active among rious forms of c rb . The high adsorption capacity of di mond can have a posit ve effect on the composite m terial obtained by powder metallurgy methods by inter ng together with metal by absorbing gas s that are pr sent in the proc ss. In addition, the ultrafin particles and the nano range are characterized by high surface activity, allowing for a stro g adhesion to the matrix. The article xam nes the effect of ultrafine powde s of natural diamond, us d as f llers, n the proper ies of a c mp sit aterial m de of tin bronze, depending on the percentage and gr in size. There w e mad metallographic studies of the surf ce of the samples. Th studies were carri d out using the theories of grain-boundary nd dispersion mechanisms of hardening. According to the res lts of m tallographic studies, calculations of the quantitative indicators of hardening were carried out using the Orowan and Hall – P ch equations. It was revea ed that the introduc on of fillers into the composition of the composite in a c rtain amou t has a positive ffec the physic and mec nical properties. © 2020 The Authors. Published by ELSEVIER B.V. This is an open acce s article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors K ywords: bond; metall matrix; composite; hardener; ultrafine particles; hardening mechanisms. IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) Structural hardening of composite materials based on a metal matrix Safonova M.N. a , Fedotov A.A. a, *, Syromiatnikova A.S. b a North-Eastern Federal University, Kulakovsky, St, 50, Yakutsk, 677000, Russia b Larionov Institute of the Physical-Technical Problems of the North SB RAS, Oktyabrskaya St, 1, Yakutsk, 677980, Russia IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) Structural hardening of composite materials based on a metal matrix Safonova M.N. a , Fedotov A.A. a, *, Syromiatnikova A.S. b a North-Eastern Federal University, Kulakovsky, St, 50, Yakutsk, 677000, Russia b Larionov Institute of the P ysical-Technic l Problems of the N rth SB RAS, Oktyabrskaya St, 1, Yakutsk, 677980, Russia Abstract Abstract

* Corresponding author. Tel.: +7-914-107-2548 E-mail address: fedot_andrey@mail.ru * Corresponding author. Tel.: +7-914-107-2548 E-mail address: fed t_andrey@mail.ru

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open-access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of the EURASTRENCOLD - 2020 guest editors 2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open-access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der the responsibility of the EURASTRENCOLD - 2020 gu st editors

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors 10.1016/j.prostr.2020.12.021