Axial compressive deformation behaviors and constructive relation for lotus-type porous copper

Lotus-type porous copper bars of 45 mm in diameter and 120 mm in length were fabricated by unidirectional solidification at hydrogen pressure of 0.2 MPa and molten temperature of 1200 °C. The compressive deformation process and its effect factors were investigated. The deformation mechanism of lotus-type porous copper was also analyzed and discussed. The compressive mechanical model of lotus-type porous metals was established using the method of linear regression. The results show that the deformation of lotus-typed porous copper consists of three stages of elastic deformation, large plastic yield deformation with mainly pore wall buckling, collapse and densification. The main deformation mechanism in the large plastic deformation stage is that the pore walls buckle in a periodic wave and then collapse and fold. The strain rate has little effect on the compressive stress parallel to the direction of pores.