The effect of plastic deformation on magnetic and magnetocaloric properties of Gd-B alloys

• Published in: Journal of magnetism and magnetic materials 2017-11, Vol.442, p.360-363
• Main Authors: Taskaev, Sergey, Skokov, Konstantin, Karpenkov, Dmitry, Khovaylo, Vladimir, Ulyanov, Maxim, Bataev, Dmitry, Dyakonov, Alexandr, Fazlitdinova, Alfiya, Gutfleisch, Oliver
• Format: Article
• Language: English
• Subjects: Adiabatic flow; Alloys; Cold rolling; Deformation effects; Entropy; Foils (structural shapes); Gadolinium base alloys; Heat exchangers; Heat treatment; Magnetic cooling; Magnetic materials; Magnetic phase transitions; Magnetic properties; Magnetic refrigeration; Magnetocaloric effect; Plastic deformation; Rare-earth alloys; Ribbons
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2017.06.077

•A significant depression of magnetization and magnetocaloric effect was found for the plastically deformed Gd-B (0, 10, 15) alloys.•Magnetic and magnetocaloric properties of plastically deformed Gd-B (0, 10, 15) alloys can be completely restored by a high temperature heat treatment.•The proposed technique is convenient for designing and producing magnetocaloric materials in proper form for Active Magnetic Regenerative heat exchanger of magnetic refrigerator. We report on the magnetocaloric effect in Gd100-xBx (x=0, 10, 15) cold rolled ribbons. A moderate entropy change ΔS=5J/kg·K and adiabatic change of ΔT=4.8K were observed for the as-cast materials in an external magnetic field of 3T which is less by 20% in comparison with the pure gadolinium metal. It was found that a significant (up to 70%) depression of magnetization and magnetocaloric properties developed in the course of plastic deformation can completely be restored by means of a high temperature heat treatment. It is concluded that cold rolling is one promising technique for producing foil shaped magnetocaloric materials suitable for designing heat exchangers of magnetic cooling devices.