Consolidation of co-base amorphous alloy powder by high-voltage discharging method

Junji Saida, Kenjiro Izutani, Yasuji Tanaka

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Amorphous Co66Fe4Ni1Si14B15 alloy powders were consolidated by high-voltage discharging at various initial packing factors, specimen resistances and input energies. Compressed amorphous alloy powders with initial packing factor of 75% are consolidated retaining their amorphous structure below in input energy of 0.53 kJ/g. The relative density of the amorphous alloy compacts has a maximum value of approximately 95% when prepared with an initial packing factor of 85% and the input energy of 0.53 kJ/g. The densification increases on starting with a lower initial packing factor. The maximum increase in densification with the retaining amorphous structure is about 12%. The amorphous alloy compacts have no distinct pores and defects. The Vickers hardness of the compacts is nearly equal to that of melt-spun ribbons with the same composition. The coercive force does not change with their relative densities. However, magnetization increases with increasing relative density and it is saturated at 0.55 T above a relative density of 90%. The change of maximum permeability with their relative densities can be fitted to an equation with a parameter β which depends on the properties of the powders and the conditions for consolidation. The value of β has been found to be 0.007 in the present case.

Original languageEnglish
Pages (from-to)1200-1206
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume60
Issue number12
DOIs
Publication statusPublished - 1996
Externally publishedYes

Keywords

  • Amorphous structure
  • Cobalt-base amorphous alloy powder
  • Densification
  • Hardness
  • High-voltage discharge consolidation
  • dc magnetic property

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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