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Article

Effect of Co, Ti and Cr Additions on Microstructure, Magnetic Properties and Corrosion Resistance of Magnetocaloric Gd-Ge-Si Alloys

1
Department of Mechanics, Materials and Biomedical Engineering, Wrocław University of Science and Technology, 25 Smoluchowskiego, 50-370 Wrocław, Poland
2
Department of Advanced Materials Technologies, Wrocław University of Science and Technology, 25 Smoluchowskiego, 50-370 Wrocław, Poland
3
Department of Materials Engineering, Częstochowa University of Technology, 19 Armii Krajowej, 42-200 Częstochowa, Poland
4
Łukasiewicz Research Network, Institute of Non-Ferrous Metals, 5 Sowińskiego, 44-100 Gliwice, Poland
*
Author to whom correspondence should be addressed.
Materials 2020, 13(24), 5758; https://doi.org/10.3390/ma13245758
Received: 28 November 2020 / Revised: 10 December 2020 / Accepted: 14 December 2020 / Published: 17 December 2020
The paper presents studies of microstructure, magnetic and corrosion properties of the Gd58Ge20Si22, Gd56Ge20Si22Co2, Gd56Ge20Si22Ti2 and Gd56Ge20Si22Cr2 (at.%) alloys after isothermal heat treatment at 1450 K for 2 h. The structure investigations of the produced materials performed by X-ray diffraction show the presence of Gd5Ge2Si2-type phase in all investigated samples. DC and AC magnetic measurements confirmed that the Curie temperature depends on the chemical composition of the produced alloys. From M(T) characteristics, it was found that the lowest Curie point (TC = 268 K) was estimated for the Gd58Ge20Si22 sample, whereas the highest value of the Curie temperature (TC = 308 K) was for the Gd56Ge20Si22Cr2 alloys. Moreover, the GdGeSi alloy without alloying additions shows the highest magnetic entropy change |ΔSM| = 15.07 J⋅kg−1⋅K−1 for the maximum magnetic field of 2 T. The maximum |ΔSM| measured for the Gd56Ge20Si22 with the addition of Co, Ti or Cr for the same magnetic field was obtained in the vicinity of the Curie point and equals to 2.92, 2.73 and 2.95 J⋅kg−1⋅K−1, respectively. Electrochemical studies of the produced materials for 60 min and 55 days exposure in 3% NaCl solution show that the highest stability and corrosion resistance were exhibited the sample with added of Ti. View Full-Text
Keywords: GdGeSi-based alloys; magnetocaloric effect; microstructure; magnetic properties; corrosion resistance GdGeSi-based alloys; magnetocaloric effect; microstructure; magnetic properties; corrosion resistance
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MDPI and ACS Style

Hasiak, M.; Chęcmanowski, J.G.; Kucharska, B.; Łaszcz, A.; Kolano-Burian, A.; Kaleta, J. Effect of Co, Ti and Cr Additions on Microstructure, Magnetic Properties and Corrosion Resistance of Magnetocaloric Gd-Ge-Si Alloys. Materials 2020, 13, 5758. https://doi.org/10.3390/ma13245758

AMA Style

Hasiak M, Chęcmanowski JG, Kucharska B, Łaszcz A, Kolano-Burian A, Kaleta J. Effect of Co, Ti and Cr Additions on Microstructure, Magnetic Properties and Corrosion Resistance of Magnetocaloric Gd-Ge-Si Alloys. Materials. 2020; 13(24):5758. https://doi.org/10.3390/ma13245758

Chicago/Turabian Style

Hasiak, Mariusz, Jacek G. Chęcmanowski, Barbara Kucharska, Amadeusz Łaszcz, Aleksandra Kolano-Burian, and Jerzy Kaleta. 2020. "Effect of Co, Ti and Cr Additions on Microstructure, Magnetic Properties and Corrosion Resistance of Magnetocaloric Gd-Ge-Si Alloys" Materials 13, no. 24: 5758. https://doi.org/10.3390/ma13245758

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