Diversity of different atomic groups in the Cu-NbTi composite under the influence of batch hydroextrusio

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Abstract

Using X-ray diffraction analysis, the patterns of changes in the atomic structure in Cu-NbTi composite materials were studied at P = 50 atm, with a moving Poisson rotation speed of 0.5 rpm. and rotation speed n = (0–5) rpm. as a result of the action of batch hydroextrusion on the samples. It was found that the samples contain different-sized structural formations with long-range, mesoscopic and short-range atomic order. It is shown that the non-monotonic change in atomic order, with an increase in the number of revolutions of rotation of the mobile Poisson, is due to the structural phase transition of order-disorder into a state with the formation of different-sized atomic groups with long-range, mesoscopic and short-range atomic order, in which the manifestation of new interatomic interaction forces characterizing the formation of intermetallic clusters of atomic groups. It was found that already in the initial state after compacting the samples, the presence of clusters in the copper matrix phase containing niobium and titanium is observed, which characterizes an increase in heterophase in the sample system under study. The result is a homogeneous finely dispersed material containing uniformly distributed multi-scale fractions of metallic and intermetallic phases in the form of crystalline, mesoscopic and amorphous fractions. This structure exhibits increased strength, which is noticeable in the form of an increase in microhardness from 1.56 GPa to 4.15 GPa.

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About the authors

Z. A. Samoylenko

Federal state budgetary institution “Donetsk Institute of Physics and Technology named after A.A. Galkin”

Author for correspondence.
Email: yulduz19.77@mail.ru
Russian Federation, Donetsk

N. N. Ivakhnenko

Federal state budgetary institution “Donetsk Institute of Physics and Technology named after A.A. Galkin”; Federal State Budgetary Educational Institution of Higher Education “Russian State Agrarian University Moscow Agricultural Academy named after K.A. Timiryazev”

Email: yulduz19.77@mail.ru
Russian Federation, Donetsk; Moscow

E. I. Pushenko

Federal state budgetary institution “Donetsk Institute of Physics and Technology named after A.A. Galkin”

Email: yulduz19.77@mail.ru
Russian Federation, Donetsk

M. Yu. Badekin

Federal State Budgetary Educational Institution of Higher Education “Russian State Agrarian University Moscow Agricultural Academy named after K.A. Timiryazev”; Federal State Budgetary Educational Institution of Higher Education “Donetsk State University”

Email: korund2002@list.ru
Russian Federation, Moscow; Donetsk

N. V. Chernyavskaya

Federal state budgetary institution “Donetsk Institute of Physics and Technology named after A.A. Galkin”

Email: korund2002@list.ru
Russian Federation, Donetsk

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2. Fig. 1. Geometry of the end surface of nanofibrous Cu–NbTi composite.

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3. Fig. 2. Diffraction patterns of the Cu–NbTi composite at P = 50 atm, a movable Poisson rotation speed of 0.5 rpm and a rotation speed of n = (0–5) rev.: (a) — n = 0 rev., (b) — n = 0.5 rev., (c) — n = 2 rev., (d) — n = 5 rev.

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4. Fig. 3. Dependence of the concentration of crystalline (Ccr) and mesoscopic (Cmez) clusters on the number of revolutions of the moving Poisson.

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5. Fig. 4. Change in microhardness of the Cu–NbTi composite depending on the number of revolutions of the movable Poisson.

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6. Fig. 5. Change in the intensities of coherent (Icoh) and incoherent (Iincoh) scattering from the number of revolutions of the moving Poisson.

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