Microstructure and mechanical properties of Cu-based bulk amorphous alloy billets fabricated by spark plasma sintering

Chang Kyu Kim, Han Sang Lee, Seung Yong Shin, Jae Chul Lee, Do Hyang Kim, Sunghak Lee

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

In this study, Cu-based bulk amorphous alloy billets were fabricated by a powder metallurgy route, and their microstructure and mechanical properties were investigated. Rapidly solidified amorphous powders were produced by a conventional N2 gas atomization method. In order to consolidate amorphous alloy billets, a spark plasma sintering (SPS) equipment was set up, and variables for hot consolidation were established. Using the consolidation temperature of 480 °C under a pressure of 80 MPa, good quality amorphous alloy billets having very few micropores or crystalline phase particles were obtained. Compressive strength of the billet was 1.8 GPa, which was about 6% lower than that of the cast amorphous alloy billet. This reduction was associated with the presence of few micropores, crystalline phase particles and thin oxide layers formed along prior powder boundaries in the billets. Amorphous matrix composite billets containing Cu particles homogeneously distributed in the amorphous matrix were successfully fabricated by the SPS consolidation. These composite billets showed a considerable amount of plastic strain because of the presence of ductile Cu particles, although their compressive strength was lower than that of the amorphous alloy billets.

Original languageEnglish
Pages (from-to)293-299
Number of pages7
JournalMaterials Science and Engineering A
Volume406
Issue number1-2
DOIs
Publication statusPublished - 2005 Oct 15

Keywords

  • Bulk amorphous alloy
  • Composite
  • Consolidation
  • Powder metallurgy
  • Spark plasma sintering

ASJC Scopus subject areas

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

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