Influence of Constant Magnetic Field on Mechanical Properties and Thermal Stability of the Amorphous Alloys Based on Co, Fe and Ni

Authors T.L. Tsaregradskaya , A.M. Kuryliuk , I.V. Ovsiienko , G.V. Saenko , O.V. Turkov

Physics Department, Taras Shevchenko National University of Kyiv, 64/13 Volodymyrska St., 01601 Kyiv, Ukraine

Issue Volume 12, Year 2020, Number 3
Dates Received 03 February 2020; revised manuscript received 15 June 2020; published online 25 June 2020
Citation T.L. Tsaregradskaya, A.M. Kuryliuk, I.V. Ovsiienko, et al., J. Nano- Electron. Phys. 12 No 3, 03026 (2020)
PACS Number(s), 61.43.Dq, 71.23.Cq
Keywords Amorphous alloy, Microhardness (2) , Magnetoplastic effect, Thermal stability (7) .

To develop new amorphous, amorphous-nanocrystalline and nanocrystalline materials, optimize their unique properties and successfully operate their products, knowledge of changes in their structure under the influence of external factors is required. For the practical use of amorphous metal alloys, it is important to have data on the stability or changes in their properties under the action of magnetic fields, since products based on them are often operated under conditions of prolonged exposure to this factor. An experimental study of the influence of a constant weak (B ( 0.64 T) magnetic field on the micromechanical properties and thermal stability of amorphous Co67Fe3Cr3Si15B12 and Fe40Ni40B20 alloys was conducted. It is established that the long-term action of a weak constant magnetic field leads to a magnetoplastic effect: the microhardness of amorphous alloys decreases up to 18-21 % per 100 days. Results of dilatometric experiments indicate that after treatment of amorphous Co67Fe3Cr3Si15B12 and Fe40Ni40B20 alloys by a weak magnetic field, the temperature of the intense crystallization onset increases by 40-80 K, that is, the interval of thermal stability of the alloy expands. The established effects can be explained by the fact that the magnetic field creates magnetoelastic dynamic stresses that destroy borides and silicides in the amorphous alloy, which promotes the homogenization of its structure. This causes the destruction of frozen-in crystallization centers and the formation of a new, more stable structural state with other short-range parameters and the level of internal stresses caused by the processes of structural relaxation.

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