Structure Change and Improvement of the Mechanical Properties of Lotus-Type Porous Copper by ECAE Process
Deformation behavior of lotus-type porous copper with long cylindrical pores aligned in one direction through equal-channel angular extrusion (ECAE) process was investigated using a die with channel angle of 150º. Although the density slightly increased after every pass, the porous structure remains in the process. The Vickers hardness and the compressive yield strength of lotus copper increased through the ECAE process. The compressive yield strength after 3 passes increased up to 10 times larger than that before processing. The deformation of lotus copper takes place by buckling and the shearing of the cell walls. The increase in hardness is considered to be caused by work hardening.
Hyungsun Kim, JienFeng Yang, Tohru Sekino and Soo Wohn Lee
J. Lobos et al., "Structure Change and Improvement of the Mechanical Properties of Lotus-Type Porous Copper by ECAE Process", Materials Science Forum, Vols. 620-622, pp. 757-760, 2009