Abstract：Permanent magnets with Fe-Nd-B bulk metallic glasses as precursors was fabricated. Trace zirconium was added into Fe70Nd10B20 ternary alloy and its adjacent composition. The samples were prepared by spin quenching and copper mold casting,and the glass forming ability was characterized by XRD and DSC. Then the Fe70Nd9B20Zr1 bulk metallic glasses were crystallized by annealing treatment. The crystallization phases were analyzed by XRD and the magnetic properties in various crystallization stages were characterized by VSM. The results show that the glass forming ability of the alloys is enhanced,and Fe-Nd-B-Zr bulk metallic glasses with critical diameter of 2 mm are obtained in alloys containing 1% atom fraction Zr. The optimum hard magnetic properties of Fe70Nd9B20Zr1 bulk metallic glasses can be achieved after annealing at 946 K for 600 s.The remanence (Br),coercive field (iHc) and maximum energy product (BH)max are 0.54 T,348 kA/m and 24.1 kJ/m3,respectively.This alloy system can be applied to directly synthesize nanocomposite permanent magnets by the process of casting and subsequent crystallization.
 COEHOORN R,DE MOOIJ D B,DUCHATEAU J P W B,et al.Novel permanent magnetic materials made by rapid quenching[J].Journal de Physique (France),1988,C8(49):669-670.
 KNELLER E F,HAWIG R.The exchange-spring magnet:a new materials principle for permanent magnets[J].IEEE Transactions on Magnetics,1991,27(4):3558-3600.
 MANAF A,BUCKLEY R A,DAVIES H A.New nanocrystalline high-remanence Nd-Fe-B by rapid solidification[J].Journal of Magnetism and Magnetic Materials,1993,128(3):302-306.
 INOUE A,TAKEUCHI A,MAKINO A,et al.Hard magnetic properties of Fe-Nd-B alloys containing intergranular amorphous phase[J].IEEE Transactions on Magnetics,1995,31(6):3626-3628.
 SCHRELF T,FISCHER R,FIDLER J,et al.Two-and three-dimensional calculation of remanence enhancement of rare-earth based composite magnets[J].Journal of Applied Physics,1994,76(10):7053-7058.
 SKOMSKI R,COEY J M D.Giant energy product in nanostructured two-phase magnets[J].Physical Review B,1993,48(21):15812-15816.
 ZHANG W,INOUE A.Bulk nanocomposite permanent magnets produced by crystallization of (Fe,Co)-(Nd,Dy)-B bulk glassy alloy[J].Applied Physics Letters,2002,80(9):1610-1612.
 PAWLIK P,DAVIES H A.Glass formability of Fe-Co-Pr-Dy-Zr-B alloys and magnetic properties following devitrification[J].Scirpta Materialia,2003,49(8):755-760.
 ZHANG W,INOUE A.Bulk nanocomposite permanent magnets produced by crystallization of Fe66.5Co10Pr3.5B20 bulk glassy alloy[J].Journal of Applied Physics,2002,91(10):8834-8836.
 赵文君.Fe-(Nd,Co,Zr)-Y-B系大块非晶合金的磁性能和晶化行为的研究.兰州:兰州理工大学,2007.1-55.ZHAO W J.The study on magnetic properties and crystallized behavior for the Fe-(Nd,Co,Zr)-Y-B bulk amorphous alloy.Lanzhou:Lanzhou University of Technology,2007.1-55.
 惠希东,陈国良.块体非晶合金[M].北京:化学工业出版社,2007.218-219.HUI X D,CHEN G L.Bulk Metallic Glasses[M].Beijing:Chemical Industry Press,2007.218-219.
 吴胜军.Fe-Co基大块非晶合金的磁性和结构的研究.上海:上海大学,2008.1-53.WU S J.Magnetic properties and structure research of Fe-Co based bulk metallic glasses.Shanghai:Shanghai University,2008.1-53.
 BAI Q,XU H,TAN X H,et al.Effect of Zr addition on glass-forming ability and magnetic properties of Fe-Nd-Al-B alloys prepared by suction casting[J].Chinese Physics Letters,2009,26(5):057503-1-057503-4.
 TAKEHARA H,INO H,OHKUBO T,et al.Effects of Zr and C additions on magnetic properties and microstructures of α-Fe/Nd2Fe14B nanocomposite magnets[J].Materials Transactions,2006,47(9):2399-2404.
 周增寿,董清飞.超强永磁体[M].北京:冶金工业出版社,2004.77-105.ZHOU Z S,DONG Q F.Super Permanent Magnet[M].Beijing:Metallurgical Industry Press,2004.77-105.
 MONDAL K,MURTY B S.On the parameters to assess the glass forming ability of liquids[J].Journal of Non-Crystalline Solids,2005,351(16-17):1366-1371.
 LI R,PANG S J,MA C L,ZHANG T.Influence of similar atom substitution on glass formation in (La-Ce)-Al-Co bulk metallic glasses[J].Acta Materialia,2007,55(11):3719-3726.
 LUO J,DUAN H P,MA C L,et al.Effects of yttrium and erbium additions on glass-forming ability and mechanical properties of bulk glassy Zr-Al-Ni-Cu alloys[J].Materials Transactions,2006,47(2):450-453.
 LI Q F,QIU K Q,YANG X,et al.Glass forming ability and reliability in fracture stress for Mg-Cu-Ni-Nd-Y bulk metallic glasses[J].Materials Science and Engineering A,2008,491(1-2):420-424.
 ZHANG T,LI R,PANG S J.Effect of similar elements on improving glass-forming ability of La-Ce-based alloys[J].Journal of Alloys and Compounds,2009,483(1-2):60-63.
 ZHUO L C,PANG S J,WANG H,et al.Ductile bulk aluminum-based alloy with good glass-forming ability and high strength[J].Chinese Physics Letters,2009,26(6):066402-1-066402-4.
 YIN E H,ZHANG M,PANG S J,et al.Formation of Ti-Zr-Cu-Ni-Sn-Si bulk metallic glasses with good plasticity[J].Journal of Alloys and Compounds,2010,504(Suppl 1):10-13.
 FU H,ZOU M,MUDRYK Y,et al.Enhancement of the glass-forming ability by Zr microalloying and its influence on the magnetocaloric properties of bulk amorphous Gd-Co-Al[J].Journal of Applied Physics,2010,108(5):053916-1-053916-4.
 LIAO L X,ALTOUNIAN Z.Formation,crystallization,and magnetic properties of Nd-Fe-B glasses[J].Journal of Applied Physics,1989,66(2):768-771.