Title :
Highly coercive milled and melt-spun (Pr,Nd)FeB-type magnets and their hot workability
Author :
Bollero, A. ; Kirchner, A. ; Gutfleisch, O. ; Müller, K.H. ; Schultz, L.
Author_Institution :
Inst. of Metallic Mater., IFW Dresden, Dresden, Germany
fDate :
7/1/2001 12:00:00 AM
Abstract :
Highly coercive isotropic (Pr1-xNdx)2 Fe14B-type magnets (0⩽×⩽1) have been processed using high energy ball milling and melt-spinning techniques, and an assessment of their hot deformation behavior has been carried out. A very high coercivity of μ0Hc=2.7 T and a remanence of Jr=0.72 T were found after annealing partly amorphous Pr15DyFe75.9B8Zr0.1 ribbons. Samples containing Dy (1at.%) and Zr (0.1 at.%) exhibit an improved stability against grain growth with increasing the annealing temperature. It has been found that the deformation forces necessary for texturing by hot deformation are the lowest for the as-milled Pr-containing alloys. As-milled Pr15Fe77B has been textured by die-upsetting at 750°C obtaining magnetic properties as high as Jr=1.27 T, μ0Hc=1.20 T and (BH)max=307 kJ/m3
Keywords :
annealing; boron alloys; coercive force; ferromagnetic materials; grain growth; hot working; iron alloys; melt spinning; neodymium alloys; permanent magnets; powder metallurgy; praseodymium alloys; remanence; texture; (Pr,Nd)FeB magnet; (PrNd)2Fe14B; annealing; ball milling; coercivity; deformation force; die upsetting; energy product; grain growth; hot workability; magnetic properties; melt spinning; remanence; texturing; Amorphous materials; Annealing; Ball milling; Coercive force; Iron; Magnets; Neodymium; Remanence; Stability; Zirconium;
Journal_Title :
Magnetics, IEEE Transactions on
