Microstructural and mechanical characteristics of Cu-Cu2O composites compacted with pulsed electric current sintering and hot isostatic pressing

R. Ritasalo (Corresponding Author), M.E. Cura, X.W. Liu, Y. Ge, Topi Kosonen, Ulla Kanerva, O. Söderberg, S.-P. Hannula

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This paper reports the influence of applied sintering process – pulsed electric current sintering (PECS) and hot isostatic pressing (HIP) – on the microstructure and mechanical properties of Cu–Cu2O composites. In PECS fine-grained structure was obtained while in HIPing the grain growth was more noticeable, mostly due to the longer process time. The studies also showed that Cu2O-phase distributed in Cu-matrix increased microhardness; at a fixed grains size Cu–Cu2O structure had higher hardness than Cu so that 20% higher microhardness was obtained when Cu2O was doubled from 19.1 to 37.2 vol%. At best, 99.1% density with 690 nm grain size and 1.35 GPa hardness were achieved by PECS whereas by HIP the same density with 1860 nm grain size gave 1.02 GPa hardness. The grain growth and the effect of second phase clustering on the grain growth were evaluated experimentally.
Original languageEnglish
Pages (from-to)61-69
JournalComposites Part A: Applied Science and Manufacturing
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed



  • Metal-matrix composites (MMCs)
  • particle-reinforcement
  • mechanical properties
  • microstructure

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