AI SearchDevelopment of iron-based amorphous soft magnetic alloys from commercial cast-iron
Call Number: AIT Thesis no.ME-05-09 Material type:
SeriesSeries: Asian Institute of Technology. Thesis ; no. ME-05-09Publication details: Pathum Thani, Thailand : Asian Institute of Technology, 2005Description: 44 pSubject(s): Online resources: Dissertation note: Thesis (M.Eng.) - Asian Institute of Technology, 2005 Summary: An alloy has been designed using cast iron as a base and modified by additions of A1, B, Y and Cu to the Fe-C master alloy in order to achieve glass forming ability as well as good magnetic properties. Amorphous ribbons were synthesized by rapidly quenching at 106 K/s and the devitrification process was controlled by varying the Y and Cu contents so as to achieve a composite structure of bcc Fe nanocrystals in an amorphous matrix. An improvement of saturation magnetization was observed by annealing the as-quenched ribbons. However, coercivity does not necessarily improve upon annealing, and therefore, the annealing should be judiciously scheduled. Effect of minor impurities in cast iron on the coercivity and saturation of these alloys was found to be insignificant. This study is a start towards making nanostructured materials more cost-effective without losing their functionality.
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Asian Institute of Technology Library Archives | AIT Thesis no.ME-05-09 (Browse shelf(Opens below)) | 1 | Available | 30050160028352 |
A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Advanced Technologies
Thesis (M.Eng.) - Asian Institute of Technology, 2005
An alloy has been designed using cast iron as a base and modified by additions of A1, B, Y and Cu to the Fe-C master alloy in order to achieve glass forming ability as well as good magnetic properties. Amorphous ribbons were synthesized by rapidly quenching at 106 K/s and the devitrification process was controlled by varying the Y and Cu contents so as to achieve a composite structure of bcc Fe nanocrystals in an amorphous matrix. An improvement of saturation magnetization was observed by annealing the as-quenched ribbons. However, coercivity does not necessarily improve upon annealing, and therefore, the annealing should be judiciously scheduled. Effect of minor impurities in cast iron on the coercivity and saturation of these alloys was found to be insignificant. This study is a start towards making nanostructured materials more cost-effective without losing their functionality.
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