Fabrication and compression properties of bulk hierarchical nanoporous copper with fine ligament

Nanoporous Copper-Nickel – Macroscopic bodies of a strong and deformable nanoporous base metal by dealloying

“…The graph shows engineering stress versus engineering strain plots of as-dealloyed npCN (black line) as well as samples annealed for 20, 30 and 45 min at 400 • C with corresponding ligament sizes. Analog to previous studies on nanoporous base metals [29,31,[43][44][45]57], asdealloyed npCN shows brittle deformation behavior upon compression. Still, with a compressive and fracture stress of more than 50 MPa, respectively, as-dealloyed npCN is strong compared to other nanoporous metals, such as those of Refs [19,20,32,57,58].…”

“…Another conceivable origin of the high strength of npCN might be solid solution strengthening. Indeed, macroscale compression tests on elemental nanoporous Cu (no solid solution hardening) report fracture-and yield strength not exceeding 6 MPa [31,57], substantially less than what is achieved here with npCN. Microscale tests in Ref [32] find hardness values of around 20 MPa for nanoporous Cu with a similar volume fraction.…”

Bulk hierarchical nanoporous palladium prepared by dealloying PdAl alloys and its electrochemical properties

“…However, there are few researches about the fabricating of bulk NPP materials, and the lacking of proper bulk precursor alloy is the main cause. In the former study, CuAl alloy in nanocrystalline grain were prepared by mechanical alloying and spark plasma sintering process (MA-SPS), and then bulk nanoporous copper with fine ligament and necessary strength can be obtained by chemical dealloying [14]. Thus, MA-SPS process is capable of fabricating PdAl alloy with sub-micrometer grain size, which can be used as precursor alloy to prepare bulk NPP.…”

Dealloying of Cu-Based Metallic Glasses in Acidic Solutions: Products and Energy Storage Applications

“…Hosson et al [ 25 , 26 ] studied strain in nanoporous gold. Biener [ 27 ], Lian [ 28 ] and Weissmüller et al [ 29 ] studied mechanical properties of nanoporous metal and composites. It was found that after mixing nanoporous gold with epoxy, the composite became stronger and harder than each constituent phase individually.…”