Effect of Fe content on the glass-forming ability, thermal stability of supercooled liquid and magnetic properties of Fe93-xAl5Ga2(P0.55C 0.25B0.2)x amorphous alloys

Takao Mizushima, Akihiro Makino, Akihisa Inoue

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The compositional dependence of thermal stability, glass-forming ability and magnetic properties was examined for the Fe93-xAl5Ga2(P0.55C 0.25B0.2)x alloys. As the Fe content decreases from 75 to 70 at%, the supercooled liquid region ΔTx(=Tx-Tg) and the maximum sample thickness for glass formation (tmax) increase from 38 to 70 K and 115 to 180 μm, respectively. The increase in ΔTX is due to a more significant increase in crystallization temperature (Tx) which exceeds the degree of the increase in glass transition temperature (Tg). The increases in the thermal stability of the supercooled liquid and the glass-forming ability are presumably because the optimum metalloid content increases to about 23 at% by the dissolution of Al and Ga elements with larger atomic sizes. Furthermore, the increase in the metalloid content to 23 at% was found to cause the improvement of soft magnetic properties through the decrease in coercivity to 4 A/m and the increase in permeability at 1 kHz to 2×104, though the saturation magnetization decreases to 120×10-6 Wbm/kg. The improvement is interpreted to result from the achievement of the low saturated magnetostriction (σg) of 10×10-6. The finding of the new Fe-based amorphous alloys with the wide supercooled liquid region before crystallization, the large glass-forming ability and the good soft magnetic properties combined with the low λg is important for the future development of ferromagnetic bulk amorphous alloys.

Original languageEnglish
Pages (from-to)123-128
Number of pages6
JournalScience Reports of the Rerearch Institutes Tohoku University Series A-Physics
Issue number2
Publication statusPublished - 1997 Mar
Externally publishedYes


  • 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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