Nonmetallic Inclusions in a New Alloy for Single-Crystal Permanent Magnets

• Autorzy: Belyaev I. V. , Bazhenov V. E. , Kireev A. V. , Moiseev A. V.

Identyfikatory

DOI

10.24425/122494

• Języki publikacji: EN

Abstrakty

EN

The morphology, chemical composition and formation mechanism of non-metallic inclusions in magnetic alloy of Fe-Co-Ni-Cu-Al-Ti-Hf system were investigated. These alloys are used in manufacturing single-crystal permanent magnets. Modern methods for the identification of non-metallic inclusions, as well as computer simulation of the processes of their formation by Thermo Calc software were used in the work. It was found that studied alloy contains (Ti, Hf)S titanium and hafnium sulfides, (Ti, Hf)₂SC titanium and hafnium carbosulfides, Ti₂O₂S titanium oxisulfide, HfO₂ hafnium oxide, and Al₂O₃ aluminum oxide. No titanium and hafnium nitrides were found in the alloy. The bulk of nonmetallic inclusions are (Ti, Hf)₂SC carbosulfides and (Ti, Hf)S sulfides. All carbides and many oxides are within carbosulfides and sulfides. When the sulfur content in the alloy is no more than 0.2%, and carbon content does not exceed 0.03%, carbosulfides are formed in the solidification range of the alloy and has an faceted compact form. If the sulfur content in the alloy becomes more than 0.2% and carbon content more than 0.03%, the carbosulfide formation begins before the alloy solidification or at the beginning stages of solidification. In this case, carbosulfides are dendritic and coarse. Such carbosulfides actively float in the solidified melt and often come to the surface of the castings. In this case, specific surface defects are formed in single-crystal magnets, which are called sulfide stains. All titanium and hafnium sulfides are formed at the lower part of solidification range and have elongated shape.

Słowa kluczowe

EN

magnetic alloy; single crystals; nonmetallic inclusions; formation mechanism

PL

stop magnetyczny; monokryształ; wtrącenia niemetaliczne

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2018
• Tom: Vol. 18, iss. 2
• Strony: 11--14
• Opis fizyczny: Bibliogr. 11 poz., rys., tab.

Twórcy

autor

Belyaev I. V.

• Department of Functional and Constructional Materials, Vladimir State University named after A.G. and N.G. Stoletovs, Vladimir, Russia

autor

Bazhenov V. E.

• National University of Science and Technology \"MISiS\", Leninskiy pr. 4, 119049 Moscow, Russia

autor

Kireev A. V.

• Department of Functional and Constructional Materials, Vladimir State University named after A.G. and N.G. Stoletovs, Vladimir, Russia

autor

Moiseev A. V.

• Research and Production Association “Magneton”, Vladimir, Russia

Bibliografia

• [1] Belyaev, I.V., Bazhenov, V.E., Moiseev, A.V. & Kireev, A.V. (2016). New Fe–Co–Ni–Cu–Al–Ti Alloy for Single Crystal Permanent Magnets. The physics of metals and metallography. 117(3), 214-221. https://doi.org/10.1134/ S0031918X16010038.
• [2] Belyaev, I.V., Moiseev, A.V., Kutepov, A.V., Lomtev, L.A. & Kireev, A.V. (2015). Study of the Effect of Hafnium on the Magnetic Properties of Permanent Magnets with Single-Crystal Structure from Alloy YuNDKT5AA. Metal Science and Heat Treatment. 56(11-12), 626-629. https://doi.org/10.1007/s11041-015-9812-7.
• [3] Sokolov, V.M., Stomakhin, A.Ja. & Larichkina, R.Ja. (1992). Maloothodnaya tekhnologiya polucheniya otlivok dlya postoyannyh magnitov. Processylit'ja. (3), 99-104. (in Russian).
• [4] Pikunov, M.V., Belyaev, I.V., Sidorov, E.V. (2002). Kristallizaciya splavov i napravlennoe zatverdevanie otlivok. Vladimir: Vladimirskij gosudarstvennyj universitet. (in Russian).
• [5] Grigorovich, K., Burkhanov, G., Shibaev, S., Dolmatov, A., Belyaev, I. & Kolchugina, N. (2009) Fractional gas analysis procedure for determining the contents of oxide and nitride phases in Alnico alloys. Metallurgija. 48(3), 187-191.
• [6] Belyaev, I.V., Grigorovich, K.V., Kolchugina, N.B. & Shibaev, S.S. (2010) Effect of the Purity of Starting Materials on the Structure and Properties of Permanent Magnets. Inorganic Materials. 46(3), 291-294. DOI: 10.1134/S0020168510030143.
• [7] Sokolov, V.M. (1991). Vliyanie azota na strukturu monokristallicheskogo splava dlya postoyannyh magnitov. Izvestija vuzov. Chjornaja metallurgija. (12), 67-69. (in Russian).
• [8] Malinochka, Ya.N., Kovalchuk, G.Z. (1988). Sulfidy v stalyah i chugunah. Moscow: Metallurgiya. (in Russian).
• [9] Bouhemadou, A. & Khenata, R. (2008). Structural, electronic and elastic properties of M2SC (M = Ti, Zr, Hf) compounds. Physics Letters A. 372(42), 6448-6452. https://doi.org/10.1016/j.physleta.2008.08.066.
• [10] Wally, P. & Veki, M. (1998). Thermal stability of transition metal carbosulfides prepared by combustion synthesis. Journal of Alloys and Compounds. 268(1-2), 83-88. https://doi.org/10.1016/S0925-8388(97)00578-1.
• [11] Du, Y.L., Sun, Z.M., Hashimoto, H. & Tian, W.B. (2008). First-principles study on electronic structure and elastic properties of Ti2SC. Physics Letters A. 372(31), 5220-5223. https://doi.org/10.1016/j.physleta.2008.05.079.

Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).