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Title: Laser assisted crystallization of ferromagnetic amorphous ribbons: A multimodal characterization and thermal model study

This paper focuses on laser-based de-vitrification of amorphous soft magnetic Fe-Si-B ribbons and its consequent influence on the magnetic properties. Laser processing resulted in a finer scale of crystallites due to rapid heating and cooling during laser annealing compared to conventional furnace annealing process. A significant increase in saturation magnetization is observed for laser-annealed ribbons compared to both as-received and furnace annealed samples coupled with an increase in coercivity compared to the as received samples. The combined effect of thermal histories and stresses developed during laser annealing results in the formation of nano-crystalline phase along the laser track. The phase evolution is studied by micro-XRD and TEM analysis. Solute partitioning and compositional variation within the phases are obtained by Local Electrode Atom probe analysis. The evolution of microstructure is rationalized using a Finite Element based heat transfer multi-physics model.
Authors:
; ; ; ;  [1] ; ; ;  [2] ;  [3]
  1. Laboratory of Laser Materials Processing and Synthesis Department of Materials Science and Engineering University of North Texas, Denton, Texas 76207 (United States)
  2. William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352 (United States)
  3. Schhol of Materials Science and Engineering Nanyang Technological University, Singapore 639798 (Singapore)
Publication Date:
OSTI Identifier:
22257754
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 18; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANNEALING; ATOMS; COERCIVE FORCE; COOLING; CRYSTALLIZATION; ELECTRODES; FINITE ELEMENT METHOD; HEAT TRANSFER; HEATING; LASERS; MAGNETIC PROPERTIES; MAGNETIZATION; MICROSTRUCTURE; NANOSTRUCTURES; PARTICLE TRACKS; PARTITION; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION