Controlling melt convection - An innovation potential for concerted microstructure evolution of Nd-Fe-B alloys

O. Filip, R. Hermann, G. Gerbeth, J. Priede, K. Biswas

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The solidification process and the resulting microstructure of Nd-Fe-B alloys in consideration of melt convection has been investigated experimentally with a specially designed forced crucible rotation technique. Samples were subjected to well-defined forced rotation and vibration, respectively, during induction heating and solidification. A concerted microstructure evolution is possible by enhancement or suppression of the melt convection. As a result, the microstructure pattern, mainly the volume fraction of the soft magnetic α-Fe phase, vary strongly with the strength of the internal flow motion. A distinct reduction of the α-Fe volume fraction in samples with strong melt rotation was observed by measuring the magnetic moment. Moreover, the melt flow was studied numerically taking into account the coupled heat and fluid flow fields. Furthermore, a new category of experiment has been started where a tailored magnetic field was applied in order to study the microstructure evolution due to an enhancement or suppression of the melt convection by additional alternating magnetic fields.

Original languageEnglish
Pages (from-to)302-305
Number of pages4
JournalMaterials Science and Engineering A
Volume413-414
Early online date20 Oct 2005
DOIs
Publication statusPublished - 15 Dec 2005
Externally publishedYes

Fingerprint

convection
Innovation
microstructure
Microstructure
solidification
Solidification
Volume fraction
retarding
Magnetic fields
induction heating
internal flow
Induction heating
augmentation
Crucibles
crucibles
Magnetic moments
magnetic fields
heat transmission
fluid flow
Flow of fluids

Keywords

  • Melt convection
  • Nd-Fe-B magnets
  • Solidification

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Controlling melt convection - An innovation potential for concerted microstructure evolution of Nd-Fe-B alloys. / Filip, O.; Hermann, R.; Gerbeth, G.; Priede, J.; Biswas, K.

In: Materials Science and Engineering A, Vol. 413-414, 15.12.2005, p. 302-305.

Research output: Contribution to journalArticle

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