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Rapid quenched powdered ribbons Nd13.6Co6.6Ga0.6B5.5Fe73.7 (at. %) were hot pressed at 700o C. Next, the alloys were subjected to die-upset process through heating to 600, 750 and 1000o C and forged at a rate of 1x10-3 s-1 to the stage of deformation equal to �A = 60%. Directional grain growth occurs in the material during this treatment, which is beneficial due to the anisotropic magnetic properties obtained in such materials. Detailed analysis performed using transmission electron microscopy shows the tendency of micro structural changes in the magnet resulting from the application of different temperatures of the processes.
Wydawca
Czasopismo
Rocznik
Tom
Strony
4--10
Opis fizyczny
Bibliogr. 8 poz., rys., fot.
Twórcy
autor
- Institute of Precision Mechanics, Warsaw, Poland
Bibliografia
- 1. Bushow K.H.J.: Ferromagnetic Materials. E.P. Wohlfarth and K.H.J. Bushow [ed], Elsevier Science Publisher B.V. v.4.1988.
- 2. Rivoirard S., de Rango P., Fruchart D., Perrier de la Bâthie R., Chateigner D.: NdFeB-magnets prepared by a high-speed forging process: microstructure and magnetic properties. Proc XVIth Intern. Workshop in Rare Earth Magnets and Their Applications, ed Kaneko H., Japan 1(2000), pp 337-346.
- 3. Grünberger W., Hinz D., Kirchner A., Müller K.H., Schultz L.: Hot deformation of nanocrystalline Nd-Fe-B alloys. J. Alloys and Compounds 257(1997), pp. 293-301.
- 4. Derewnicka D., Krztoń H., Leonowicz M.: Texture analysis in die-upset forged Nd-Fe-B Magnets. Inżynieria Materiałowa 3-4(28)(2007) pp. 247-253.
- 5. Derewnicka D.: Powstawanie anizotropii strukturalnej i magnetycznej w odkształcanych na gorąco stopach Nd-Fe-B. Rozprawa doktorska. Instytut Mechaniki Precyzyjnej, Warszawa, 2006.
- 6. Mishra R.K., Panchanathan V., Croat J J.: The microstructure of hot formed neodymium–iron–boron magnets with energy product 48 MG Oe. J. Appl. Phys. 73(1993), pp. 6470-6472.
- 7. Leonowicz M., Derewnicka D., Krztoń H., Panchanathan: Structural Anisotropy in NdFeB Magnets Processed by Hot Working of Melt-Spun Ribbon Powder. Proc. Powder Metallurgy & Particulate Materials World Congress, Orlando, USA (2002) pp. 14-1 – 14-10.
- 8. Mishra R.K., Brewer E.G., Lee R.W.: Grain growth and alignment in hot deformed Nd-Fe-B magnets. J. Appl Phys. 63(8)(1988), pp. 3528- 3530.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BPG8-0018-0022