Conducting Medium Electrical Conductivity at High Current Density

The experimental research example of electrical characteristics of structurally heterogeneous thinlayer conductors (nickel, copper) at high current density (10⁸--10⁹ А/m²) is shown. This current density in conditions of the samples intensive cooling is sufficient for the process of irreversible, nonthermally activated deformation. The experiment results show that the conducting medium at high current density has essential nonlinearities expressed in nonlinear dependence of the samples electrical resistance from current density. With repeated current treatments of the samples the conductors' electrical resistivity decreases. The number of defects removed from the volume of material as a result of nickel foil treatment by electric current is estimated. It is shown that under conditions of highdensity direct electric current flow in microvolumes of homogeneous and inhomogeneous conducting media a volume charge can appear. The appearance of the volume charge in a conducting medium can be caused by interaction forces during the motion of electrons and ions. Due to the interaction forces between ions and electrons of basic material and impurities, additional local ionization occurs which is realized in nano-volumes of a conductor. In the case of heterogeneous medium, the volume charge depends on the nature of the specific conductivity distribution. In a homogeneous conductor the volume charge is proportional to the square of the current density in the sample

References

[1] Baranov Yu.V., Troitskiy O.A., Avraamov Yu.S., et al. Fizicheskie osnovy elektroimpul’snoy i elektroplasticheskoy obrabotki i novye materialy [Physical fundamentals of electropulse and electroplastic processing and new materials]. Moscow, MGIU Publ., 2001.

[2] Conrad H., Karam N., Mannan S., et al. Effect of electric current pulses on the recrystallization kinetics of copper. Scr. Metall., 1988, vol. 22, iss. 2, pp. 235--238. DOI: https://doi.org/10.1016/S0036-9748(88)80340-5

[3] Deev V.B., Selyanin I.F., Bashmakova N.V., et al. Effect of electric current on the crystallization of aluminum alloys containing iron. Liteyshchik Rossii, 2007, no. 8, pp. 12--15 (in Russ.).

[4] Deev V.B., Selyanin I.F., Nokhrina O.I., et al. Modifying treatment of alloys by magnetic field. Liteyshchik Rossii, 2008, no. 3, pp. 23--25 (in Russ.).

[5] Deev V.B., Selyanin I.F., Ri Khosen, et al. Efficient technologies of melts treatment when producing the aluminum alloys. Liteyshchik Rossii, 2012, no. 10, pp. 19--21 (in Russ.).

[6] Timchenko S.L., Kobeleva L.I., Zadorozhnyy N.A. Effect of electric current on the structure and properties of Al alloy. Fizika i khimiya obrabotki materialov [Physics and Chemistry of Materials Treatment], 2011, no. 6, pp. 82--87 (in Russ.).

[7] Timchenko S.L., Zadorozhnyj N.A. Change in the structure of the aluminium alloy under the action of direct electric current. IOP Conf. Ser.: Mater. Sci. Eng., 2019, vol. 683, art. 012044. DOI: https://doi.org/10.1088/1757-899X/683/1/012044

[8] Laptev A.B., Pervukhin M.V., Afanas’yev-Khodykin A.N., et al. Electric transfer of ions of alloying elements in aluminum alloys by magnetohydrodynamic melt processing. Zhurnal SFU. Tekhnika i tekhnologii [Journal of SibFU. Engineering & Technologies], 2017, vol. 10, no. 8, pp. 1031--1041 (in Russ.).

[9] Korobova N.V., Aksenenko A.Yu., Tarasov F.E., et al. Prospects of application of electromagnetic impact on melt under introduction of modifying additives during crystallization. Metallurgiya mashinostroeniya, 2013, no. 1, pp. 8--11 (in Russ.).

[10] Sidorenkov V.V. On mechanism of texturing metals under electric current impact. DAN SSSR, 1989, vol. 308, no. 4, pp. 870--873 (in Russ.).

[11] Predvoditelev A.A., Tyapunina N.A., Zinenkova G.M., et al. Fizika kristallov s defektami [Physics of crystals with defects]. Moscow, MSU Publ., 1986.

[12] Gordeev V.F., Pustogarov A.V., Kucherov Ya.R., et al. Oriented recrystallization of metals under electric current flow. Appl. Phys. Lett., 1980, vol. 6, no. 23, pp. 1416--1417.

[13] Gordeev V.F., Pustogarov A.V., Kucherov Ya.R., et al. Effect of electric current on the orientation of metal structure during recrystallization. Izv. SO AN SSSR. Ser. tekhn. nauk, 1984, vol. 16, no. 3, pp. 137--139 (in Russ.).

[14] Timchenko S.L. Investigation of crystallization of alloy under the action of electrical current. Rasplavy [Melts], 2011, no. 4, pp. 53--61 (in Russ.).

[15] Sidorenkov V.V., Timchenko S.L. On physical nature of phenomenological law for metals electrical conductivity. Herald of the Bauman Moscow State Technical University, Series Instrument Engineering, 1994, no. 2, pp. 110--119 (in Russ.).

[16] Kornev Yu.V., Sidorenkov V.V., Timchenko S.L. The physical nature of the electricconduction law for metals. Dokl. Phys., 2001, vol. 46, no. 10, pp. 690--693. DOI: https://doi.org/10.1134/1.1415580

[17] Geguzin Ya.E. Makroskopicheskie defekty v metallakh [Macroscopic defects in metals]. Moscow, Metallurgizdat Publ., 1962.

[18] Dahmlow P., Muller S.C. Pattern formation in microemulsions affected by electric fields. In: Muller S., Plath P., Radons G., Fuchs A. (eds). Complexity and Synergetics. Cham, Springer, 2018, pp. 117--128. DOI: https://doi.org/10.1007/978-3-319-64334-2_10