Strengthening of lotus-type porous copper by ECAE process

J. Lobos*, S. Suzuki, H. Utsunomiya, H. Nakajima, M. A. Rodrigez-Perez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Lotus-type porous copper with directional cylindrical pores was fabricated by unidirectional solidification in a pressurized hydrogen atmosphere. Improvements in microstructure and mechanical properties of the lotus-type porous copper by equal-channel angular extrusion (ECAE) were investigated using a die with a channel angle of 150°. The porosity decreases with increasing pass number, and decreases from 46% to 30% by four passes. It means that pore closure in the ECAE process is not significant. Both the specific compressive yield strength σ0.2% and the Vickers hardness HV of the lotus copper increase with increasing pass number of ECAE. The ECAE processed porous copper shows improved σ0.2% and HV comparable to those of the extruded nonporous copper. It is suggested that ECAE is a promising method to strengthen porous metals without significant pore closure.

Original languageEnglish
Pages (from-to)2007-2011
Number of pages5
JournalJournal of Materials Processing Technology
Issue number10
Publication statusPublished - 2012 Oct


  • Equal-channel angular extrusion
  • Lotus-type porous copper
  • Porous metals
  • Vickers hardness
  • Yield strength

ASJC Scopus subject areas

  • Ceramics and Composites
  • Computer Science Applications
  • Metals and Alloys
  • Industrial and Manufacturing Engineering


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