Effects of carbon content and size on Ti-C reaction behavior and resultant properties of Cu-Ti-C alloy system

Fenglin Wang, Yunping Li, Akihiko Chiba

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

TiC-strengthened Cu alloys with various nominal compositions were prepared by a high-energy ball-milling process, followed by consolidation using spark plasma sintering (SPS), and a subsequent heat treatment. The results indicated that the lower atomic ratio of C/Ti, the more residual Ti in copper matrix, resulting in a lower electrical conductivity but higher microhardness of alloy. The optimal atomic ratio was found to be close to1.0. The reaction behavior of Ti-C in the Cu-Ti-C system during this process was investigated. Microstructural results suggested that TiC formation is through a diffusion-controlled mechanism. A thin TiC layer was formed at the surface of C particles, and the growth of TiC layer was controlled by interdiffusion of C and Ti atoms across the TiC layer. An incomplete chemical reaction between Ti and C, characterized by a core-shell structure, was observed when the initial C particles were large, and the TiC particle size was found to strongly depending on the C particle size.

Original languageEnglish
Pages (from-to)186-192
Number of pages7
JournalMaterials Characterization
Volume141
DOIs
Publication statusPublished - 2018 Jul

Keywords

  • Core-shell structure
  • Dispersion-strengthened copper
  • High-energy ball-milling
  • In-situ reaction

ASJC Scopus subject areas

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

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