Preparation of thick amorphous alloy sheets in multicomponent Fe-based systems and their thermal and magnetic properties

Akihisa Inoue, Takao Mizushima, Akihiro Makino

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Thick amorphous sheets with thickness up to about 200 μm were formed for the Fe72Al5Ga2P10C6B 4Si1 alloy with a wide supercooled liquid region of 58 K before crystallization. The glass transition temperature (T8), crystallization temperature (Tx) and supercooled liquid region ΔTx(=Tx-Tg) remain unchanged in the entire thickness range. However, the heat of structural relaxation decreases from 2.2 kJ/mol for the 22 μm thick ribbon to 0.48 kJ/mol for the 160 μm thick ribbon, accompanying the increase in Tc from 597 K to 619 K. In comparison with the other amorphous alloy ribbons in the same Fe-(Al,Ga)-(P,C,B,Si) system, there is a clear tendency for the maximum sample thickness for glass formation (tmax) to increase with increasing ΔTX. The Fe-Al-Ga-P-C-B-Si amorphous sheets have high saturation magnetization of about 180×10-6 Wbm/kg and low coecivity of about 5 A/m in the annealed state and their values remain unchanged in the thickness range up to 200 μm. The permeability (μe) at 1 kHz shows the high values of 12000 for the 30 μm thick ribbon and decreases to about 7000 for the 200 μm thick ribbon. It is to be noticed that the good soft magnetic properties of 5 A/m for Hc and 7000 for μe as well as the wide supercooled liquid region of 58 K are obtained for the thick amorphous sheets with thickness of 150 to 200 μm. These characteristics for the thick amorphous ribbons have not been obtained for Fe-based amorphous alloys previously reported. It is therefore expected that the thick amorphous ribbons cause a further extension of the application fields of ferromagnetic amorphous alloys.

Original languageEnglish
Pages (from-to)115-121
Number of pages7
JournalScience Reports of the Rerearch Institutes Tohoku University Series A-Physics
Volume43
Issue number2
Publication statusPublished - 1997 Mar 1
Externally publishedYes

Keywords

  • Ferromagnetic glassy alloy
  • Rapid solidification
  • Sample thickness
  • Soft-magnetic property
  • Wide supercooled liquid region

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys

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