Comparison of morphology and compressive deformation behavior of copper foams manufactured via freeze-casting and space-holder methods

Copper (Cu) foams with high porosity of about 63–78% were processed by the freeze-casting (FC) and space-holder (SH) methods. The FC SH techniques yielded lamellar polygonal pore structures, respectively, similar porosities. deformation behaviors two different types Cu compared using uniaxial compression a simultaneous acoustic emission (AE) video recording analysis. It was found that compressive yield strength values for FC-Cu SH-Cu significantly different, which 19–29 MPa 1.2–2.3 MPa, respectively. Furthermore, energy absorbed during up to strain 50% obtained as ∼12.3 MJ m−3 ∼2.7 foams, resulting in approximately 4.6 times higher absorption capability foam. processes occurring studied AE image evaluated parameters (e.g., voltage, cumulative number events, energy) revealed that, case foam, localized fracture struts within well-defined single band took place, gave rise pronounced signals (mostly plateau stage compression). By contrast, highly homogeneous main mechanisms gradual bending buckling foam compression.