Mechanism of active dissolution of nanocrystalline Fe[sbnd]Si[sbnd]B[sbnd]P[sbnd]Cu soft magnetic alloys

Zhenhua Dan, Fengxiang Qin, Yan Zhang, Akihiro Makino, Hui Chang, Nobuyoshi Hara

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Nanocrystalline Fe83.3Si3B10P3Cu0.7 alloys have a heterogeneous microstructure consisting of α-Fe nanocrystals with an average size of few tenths of nanometers and an amorphous residual phase. Nanocrystalline alloy annealed at 698 K has a saturated magnetic flux density of 1.81 T and coercivity of 11.8 A m− 1. Its hetero-amorphous microstructure undergoes active dissolution in H2SO4, and α-Fe grains are preferentially dissolved in the form of micro-coupling cells between anodic α-Fe grains and cathodic amorphous residue and Cu clusters. Because the P enrichment in the residual phases inhibits the anodic dissolution of Fe and the α-Fe grains act as sacrificial anodes, the amorphous residual phases do not readily dissolve. The final residual phase is amorphous and has a nanoporous structure with a pore size similar to that of the precipitated α-Fe grains after annealing. The active dissolution behavior is determined by the microstructure of nanocrystalline Fe83.3Si3B10P3Cu0.7 alloys.

Original languageEnglish
Pages (from-to)9-16
Number of pages8
JournalMaterials Characterization
Volume121
DOIs
Publication statusPublished - 2016 Nov 1
Externally publishedYes

Keywords

  • Active dissolution
  • Amorphous residue
  • Micro-coupling
  • Nanocrystalline Fe-based alloy
  • Nanoporous structure
  • Soft-magnetic alloy

ASJC Scopus subject areas

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

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