The formation of nanostructured materials by consolidating ultrafine amorphous alloy particles prepared by chemical reduction

Junji Saida, Akihisa Inoue, Tsuyoshi Masumoto

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Amorphous (Fe, Co, Ni)-B binary and ternary alloy particles of diameter 20-50 nm can be prepared by chemical reduction using KBH4 as a reduction agent. In the FeB binary system, structure and chemical concentration of particles depend on the mixing molar ration of KBH4 to Fe2+ ions MR. The structure is amorphous for MR≥ 10.0 and with decreasing MR a crystalline α-phase is precipitated in an amorphous matrix. The B concentration in the amorphous phase is about 33 at.% for MR≥ 9.0 and about 25 at.% for MR {slanted equal to or less-than} 8.0. The amorphous alloy particles in (Fe, Ni, Co)-B binary and ternary systems are consolidated to a cylindrical shape at various temperatures. The structure of hot-pressed compacts is amorphous for pressing temperatures below the crystallization temperature. Tx. These crystalline phases are confirmed to have a nanometer-scale structure. It is concluded that these particles should form a fully dense amorphous bulk or a crystalline bulk consisting of nanometer-scale mixed phase.

Original languageEnglish
Pages (from-to)577-581
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

Fingerprint

Dive into the research topics of 'The formation of nanostructured materials by consolidating ultrafine amorphous alloy particles prepared by chemical reduction'. Together they form a unique fingerprint.

Cite this