The document discusses amorphous alloys and their applications as soft magnetic materials. It describes their unique properties such as high strength and elasticity. It also discusses various alloys, preparation methods, and device applications. Some key applications discussed are magnetic heads, inductive components, transformers, motors, sensors and transducers. While several commercial applications exist, the usage of amorphous alloys in transformers has been slower than expected due to technical challenges and improvements in traditional materials.

1. Application of soft magnetic of amorphous alloys Nguyen Hoang Viet Nano-Particulate Materials Processing (NPMP)

3. Amorphous configuration exhibits unique properties such as h igh strength, large elastic limit, excellent wear & corrosion resistance… Terms: Amorphous Alloys, (Bulk) Metallic glasses, Inorganic Amorphous Materials,… Crystalline Structure Amorphous Structure Properties of Metallic Glasses High strength & elasticity of BMGs Potential for structural application High strength of Ti- based BMGs ~ 2200MPa Adapted from http:// www.nanonet.go.jp/english/mailmag/2004/014a.html Characteristics of Metallic Glass

4. Diffraction pattern (TEM) Complete amorphization after 20h of MA Ti 50 Cu 25 Ni 20 Sn 5 amorphous alloy by MA Amorphous Structure Charactezations DSC analysis Glass transition Temp. Crystallization Temperature After Oanh NH et. al. NPMP LAB [3] .

6. Preparation [5] *: rapid quenching method **: sintering – SPS, hot press, hot extrusion,… Mold casting, consolidation of amor. powder and ribbon ** . Bulk Water-in quenching technique * Wire Planar flow (tape) casting * or melt spinning Ribbon Mechanical alloying, atomization * , electrodeposition Powder Method Form

7. Relationship between permeability,  e (at 1 kHz) and saturation polarization for soft magnetic materials (adapted from Ref. [193] [4] ). Isotropic magnetic properties? Stress – differences in cooling rates through thickness of ribbons => Anisotropy Thermal annealing – removal of internal stresses => Mitigating the Anisotropy Fig.: The Nd 60 Fe 10 Co 20 Al 10 alloys prepared by splat quenching, melt spinning, and mold casting. Primary crystallization of amorphous precursors => very fine nanocrystalline grain size in amorphous matrix

8. Designing and developing a nanocrystalline soft magnetic material from an amorphous precursor route [5-Michael E. McHenry et. al. ]

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