Abstract
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 language | English |
|---|---|
| Pages (from-to) | 2007-2011 |
| Number of pages | 5 |
| Journal | Journal of Materials Processing Technology |
| Volume | 212 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 2012 Oct |
Keywords
- 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