Effect of Porosity and Pore Morphology on the Elastic Properties and Compressive Deformation Behavior of Porous Copper Fabricated via Space‐Holder Route

Advanced applications, including heat exchangers, catalytic substrates, and batteries, may benefit from porous copper, as their functions depend on porosity and pore morphology. In this study, how porosity and pore morphologies affect porous copper's elastic and compressive deformation characteristics is examined. By varying the mixture ratios of finer K 2 CO 3 and coarser NaCl as pore formers, samples with both single‐ and dual‐pore morphologies and porosities from 36% to 73% are fabricated. The longitudinal elastic constants in three orthogonal directions are measured using nondestructive ultrasonic phase spectroscopy. Dual‐pore samples show excellent elastic characteristics, with a maximum longitudinal elastic constant >50 GPa. The pore flattening during green body production causes transverse isotropy in all samples. While yield stress decreases with porosity, pore shape does not affect compressive stress–strain behavior. In the Ashby material property map, it is shown that dual‐pore porous copper samples may be suitable for lightweight elastic hinges based on their yield strength and Young's modulus.