Compositional Effect on the Crystallization Behavior of Co-Fe-Si-B Amorphous Alloys with Zero Magnetostriction

Akihiro Makino, Akihisa Inoue, Tsuyoshi Masumoto

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9 Citations (Scopus)

Abstract

Compositional dependence on crystallization behavior was examined for (Co0.94Fe0.06)100-x-ySixBy and Co70.5-x Fe4.5MxSi10B15 (M=transition metal) amorphous alloys with nearly zero magnetostriction. The crystallization occurs through one exothermic peak in the limited range of 26 to 27%(Si + B) and 0.5 Si/(Si + B) and two exothermic peaks in the other range. The onset temperature of the first exothermic peak (Txl) increases with an increase of Si and B contents and a decrease of Si/(Si + B) from 0.7 to 0.5. The decrease of Txl with an increase of Si/(Si + B) is due to an easier precipitation of Co2Si as compared with Co3B. The heat of crystallization (ΔHx) decreases with an increase of Si and B contents and shows a minimum value near 0.5 Si/(Si + B) for the alloys with the same metalloid content. The replacement of Co by Nb or Ta gives rise to a remarkable increase of Txl. The Co-Fe-M-Si-B amorphous alloys containing 2 at% Nb or Ta crystallize through a simultaneous precipitation of crystalline phases and the crystalline structure is very fine because of the degradation of growth due to the dissolution of Nb or Ta. The two types of alloys exhibit smaller ΔHx at compositions having larger glass-forming capacity. The tendency is interpreted by the assumption that the short-range atomic configuration in the amorphous alloys with large glass-forming capacity is similar to the corresponding equilibrium compounds.

Original languageEnglish
Pages (from-to)891-897
Number of pages7
JournalMaterials Transactions, JIM
Volume31
Issue number10
DOIs
Publication statusPublished - 1990

Keywords

  • amorphous phase
  • cobalt-iron-silicon-boron alloy
  • compositional effect
  • crystallization behavior
  • glass-forming capacity
  • zero magnetostriction

ASJC Scopus subject areas

  • Engineering(all)

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