Production of nanocrystalline b.c.c. FeNbB bulk alloys by warm extrusion and their magnetic properties

A. Kojima, H. Horikiri, Y. Kawamura, A. Makino, A. Inoue, T. Masumoto

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

A bulky Fe84Nb7B9 alloy was obtained by extruding the powders ground from amorphous ribbon, at temperatures Te between 563 K and 723 K at pressures Pe between 824 MPa and 1208 MPa and at a speed of 5 mm s-1. The bulk Fe84Nb7B9 alloy extruded at Te = 698 K and Pe = 1208 MPa is in a fully consolidated state has a density of about 99%. The bulk alloy is composed of a mostly single b.c.c. phase with a grain size of about 10 nm after annealing for 3.6 ks at temperatures between 873 K and 973 K, and its soft magnetic property tends to better for the bulks extruded at lower pressures. The bulk alloy extruded at Te = 698 K and Pe = 824 MPa exhibits a high saturation magnetization Bs of 1.40 T and a low coercive force Hc of 64 A m-1 after annealing at 698 K.

Original languageEnglish
Pages (from-to)511-515
Number of pages5
JournalMaterials Science and Engineering A
Volume179-180
Issue numberPART 1
DOIs
Publication statusPublished - 1994 May 1
Externally publishedYes

ASJC Scopus subject areas

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

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