Microstructure and Magnetic Properties of Nd60Al10Fe20Co10 Glass-forming Alloy

The microstructural variations of the Nd60Al10Fe20Co10 melt-spun ribbons and the as-cast rod were studied by high resolution transmission electron microscopy (HRTEM), x-ray diffraction (XRD) and differential scanning calorimetry. Nano-clusters in glassy matrix in both melt-spun ribbon and the as-cast rod samples were observed by HRTEM, though no obvious crystalline reflections were displayed in either the XRD or selected area electron diffraction patterns. The magnetic properties of the rod sample were compared to that of the ribbons. It was found that the coercivity of the alloy increases with the size of the nano-scaled clusters, while the cluster size increases with the reduction of cooling rate at which the sample were prepared. The relationship between the microstructure and magnetic and thermal properties of the Nd based alloy were discussed by random anisotropy model.

[1]  M. Seibt,et al.  Microstructure-controlled magnetic properties of the bulk glass-forming alloy Nd60Fe30Al10 , 2002 .

[2]  K. Saksl,et al.  High-pressure x-ray diffraction of icosahedral Zr–Al–Ni–Cu–Ag quasicrystals , 2001 .

[3]  Weihua Wang,et al.  Nd65Al10Fe25-xCox (x=0,5,10) bulk metallic glasses with wide supercooled liquid regions , 2001 .

[4]  J. Eckert,et al.  Atomic ordering and magnetic properties in Nd57Fe20B8Co5Al10 solids , 2000 .

[5]  J. Eckert,et al.  Glass-forming Ability and Magnetic Properties of Nd70−xFe20Al10Cox Alloys , 2000 .

[6]  Yat Li,et al.  Effect of crystallinity on the impact toughness of a La-based bulk metallic glass , 2000 .

[7]  J. Schroers,et al.  Repeated crystallization in undercooled Zr41Ti14Cu12Ni10Be23 liquids , 2000 .

[8]  A. Inoue.  Stabilization of metallic supercooled liquid and bulk amorphous alloys , 2000 .

[9]  J. Eckert,et al.  Magnetic properties of cast Nd60−xFe20Al10Co10Cux alloys , 1999 .

[10]  W. Johnson.  Bulk Glass-Forming Metallic Alloys: Science and Technology , 1999 .

[11]  J. Ding,et al.  Magnetoresistivity and metamagnetism of the Nd33Fe50Al17 alloy , 1999 .

[12]  T. Shen,et al.  Bulk ferromagnetic glasses prepared by flux melting and water quenching , 1999 .

[13]  Jean G. Riess,et al.  Fluorocarbons and Fluorosurfactants for In Vivo Oxygen Transport (Blood Substitutes), Imaging, and Drug Delivery , 1999 .

[14]  Yat Li,et al.  Separation of glass transition and crystallization in metallic glasses by temperature-modulated differential scanning calorimetry , 1998 .

[15]  A. Takeuchi,et al.  Ferromagnetic bulk amorphous alloys , 1998 .

[16]  Weihua Wang,et al.  Microstructure, decomposition, and crystallization in Zr41Ti14Cu12.5Ni10Be22.5 bulk metallic glass , 1998 .

[17]  Weihua Wang,et al.  Enhanced thermal stability and microhardness in Zr-Ti-Cu-Ni-Be bulk amorphous alloy by carbon addition , 1997 .

[18]  A. Inoue,et al.  Thermal stability and glass-forming ability of amorphous Nd-Al-TM (TM = Fe, Co, Ni or Cu) alloys , 1997 .

[19]  Wei Zhang,et al.  Bulk Nd-Fe-Al Amorphous Alloys with Hard Magnetic Properties , 1996 .

[20]  H. Fecht.  Thermodynamic Properties of Amorphous Solids —Glass Formation and Glass Transition— (Overview) , 1995 .

[21]  F. Luborsky,et al.  Formation and magnetic properties of Fe-B-Si amorphous alloys , 1979 .

[22]  Mely Chen Chi,et al.  Random anisotropy in amorphous ferromagnets , 1978 .