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Corrosion‐Induced Strengthening: Development of High‐Strength Nanoporous Metals
Author(s) -
Ye XingLong,
Jin HaiJun
Publication year - 2016
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201500521
Subject(s) - nanoporous , materials science , corrosion , alloy , nanoscopic scale , stiffness , composite material , metallurgy , nanotechnology
Replacing parts of a solid with voids usually weakens a material. Here, we report that a material (Au–Pt–Ag alloy) becomes stronger by 7 times, its strength increases from 50 to 345 MPa, when ≈40% of solids (Ag) is dissolved and replaced by pores during dealloying. The corrosion‐induced strengthening originates from the formation of nanoporous structure, and the high strength of nanoscale ligaments due to size effect. The results also suggest that the connectivity of nanoporous structure decreases during coarsening, leading to additional decreases in strength and stiffness, which may explain the unexpected low strength and stiffness of previously reported nanoporous gold.