Consolidation of Fe-Co based metallic glassy powder by SPS method

Rui Yamada, Noriharu Yodoshi, Akira Kawasaki, Ryuzo Watanabe

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Metallic glasses have been reported to exhibit excellent properties such as high strength, high corrosion resistance, high wear resistance, resulting from their random structure. In addition, metallic glasses usually exhibit a drastic reduction in viscosity in the supercooled liquid region. Therefore, metallic glasses have excellent workability in this temperature range and it has already been reported that large size of bulk metallic glasses are successfully fabricated in several Zr-, Pd-based metallic glasses. In recent years, Fe-based metallic glasses have been intensively studied because of their excellent mechanical performance, excellent magnetic properties and rich resources. However, due to their poor glass forming ability, the size of bulk metallic glasses is limited using a copper mold casting technique. In the present study, [(Fe 0.5Co 0.5) 0.75Si 0.05B 0.2] 96Nb 4 bulk metallic glasses are fabricated by spark plasma sintering (SPS) of amorphous powders which have been prepared by a gas atomization. To find optimum conditions in the SPS process, Time-Temperature-Transformation diagram (TTT diagram) is also constructed by isothermal differential scanning calorimetry. After consolidation of metallic glassy powders, mechanical properties of consolidated glassy specimens are measured by compressive tests. As a result, the TTT diagram can be constructed and maximum incubation time can be predicted at any holding temperature. Using SPS method, large size and nearly 100% relative dense glassy compacts are obtained with a loading pressure of 75 MPa and 400 MPa, comprising full amorphous in the case within incubation time. Compressive tests indicate that mechanical properties of consolidated specimens are still low, and one of the reasons may be the formation of approximately 50 nanometer crystalline phases between each particle observed by Transmission Electron Microscope (TEM).

Original languageEnglish
Pages (from-to)299-305
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume73
Issue number4
DOIs
Publication statusPublished - 2009 Apr 1

Keywords

  • Bulk metallic glass
  • Consolidation
  • Densification
  • Metallic glassy powders
  • Spark plasma sintering

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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