Metal Science and Heat Treatment

Dormidontov, A.; Lukin, A.; Sergeev, K.

doi: 10.1007/s11041-015-9802-9pmid: N/A

Principles for choosing magnetically hard materials for the operating conditions of magnetic systems and devices based on them are suggested.

Vasilenko, D.; Shitov, A.; Vlasyuga, A.; Popov, A.; Kudrevatykh, N.; Pechishcheva, N.

doi: 10.1007/s11041-015-9803-8pmid: N/A

Optimization of the microstructure of plates from alloys of the R – Fe – B (R: Nd, Dy) system obtained by pouring the melt onto a rotating copper drum by the method of strip casting is studied. The strip-cast Nd – Fe – B and Nd – Dy – Fe – B alloys with optimized microstructure are used to produce high-energy and high-coercivity sintered magnets.

Lileev, A.; Arinicheva, O.; Reissner, M.; Kubel, F.; Sein, V.

doi: 10.1007/s11041-015-9804-7pmid: N/A

Reversible variation of coercivity in magnets from a Sm(Co, Fe, Cu, Zr) z alloy under a cyclic heat treatment in the temperature range of 800 – 400°C is studied. The “spoiling-reconditioning” effect of the reversible variation of coercivity under the cyclic treatment is a result of changes in the local composition of elements in the phases without changes in the morphology of the structure.

Arinicheva, O.; Lileev, A.; Reissner, M.; Kubel, F.; Dormidontov, A.

doi: 10.1007/s11041-015-9805-6pmid: N/A

The effect of the temperature of homogenization on the phase composition, structure and magnetic properties of magnetically hard alloy Sm(Co0.65Fe0.26Cu0.07Zr0.02)7.5 is studied by the methods of x-ray diffraction analysis and light and scanning microscopy. The dependence of the phase composition and magnetic properties of the alloy on the homogenization temperature is determined and an optimum mode of heat treatment is suggested.

Arinicheva, O.; Lileev, A.; Lukin, A.; Reissner, M.; Kubel, F.

doi: 10.1007/s11041-015-9806-5pmid: N/A

The properties of magnets of type (Pr, Dy)2(Fe, Co, M)14B are studied in a wide temperature range (4.2 – 400 K) in up to 11.2 MA/m fields. The phase composition of the magnets is determined.

Lyakhova, M.; Semenova, E.; Ivanov, R.

doi: 10.1007/s11041-015-9807-4pmid: N/A

Hysteresis loops of cast specimens of R0.85Zr0.15(Co0.70Cu0.09Fe0.21) z (R = Sm, Gd) are measured in the temperature range of 20 – 600°C. The temperature dependences of their magnetic characteristics are plotted. The microstructure and the rearrangement of the domain structure in external fields are studied. It is shown that the specimens with a low stoichiometric ratio z, when most of the volume is occupied with a copper-enriched structural component with z ~ 5 – 6, exhibit the highest stability of the coercivity.

Gorbatenko, N.; Grechikhin, V.; Shaikhutdinov, D.

doi: 10.1007/s11041-015-9808-3pmid: N/A

The possibility of application of shape memory ferromagnetic materials (SMFM) in measuring and actuating devices of systems for automation and control of production processes is considered. Adevice implementing a bicyclic configuration with distributed magnetizing coil and a mode of pulse magnetization reversal of the active components from SMFM is suggested. Mathematical models are designed for analyzing and synthesizing the device. Results of an experimental study are presented.

Borovoi, V.; Gorbatenko, N.; Grechikhin, V.

doi: 10.1007/s11041-015-9809-2pmid: N/A

A magnetic flux measuring transducer for determining magnetic characteristics of sheet electric steels is designed and tested. To lower the transduction error due to the uncontrolled clearance between the transducer and the surface of the article and the effect of the saturation, an original shape is suggested for the transducer poles, and its geometrical parameters are optimized for determining the B (H)-characteristics of electrical steels with an error not exceeding 5%.

Shaikhutdinov, D.; Gorbatenko, N.; Shirokov, K.

doi: 10.1007/s11041-015-9810-9pmid: N/A

Results of tests of a device based on an original primary magnetic flux measuring transducer for determining the properties of electrical steels are presented. The operating principle of the device is described. The accuracy of the measurement of the dynamic magnetization curve and the efficiency of the tests are determined.

Menushenkov, V.; Gorshenkov, M.; Savchenko, E.

doi: 10.1007/s11041-015-9811-8pmid: N/A

The methods of transmission electron microscopy, x-ray diffraction and magnetic measurements are used to study the laws of formation of microstructure and magnetic properties of an AlNi alloy during cooling from the range of single-phase solid solution (1240°C) in water at a critical rate (v ~ 2 K/min) and after 10-min additional annealing of the cooled specimens at 780°C.