Effect of femtosecond laser irradiation on yield strength of nanoporous silver materials

Abstract We demonstrated an innovative and environmental-friendly method for preparing nanoporous silver materials using femtosecond laser. We found that the yield strength of nanoporous silver materials increased monotonously with the increase of the laser power due to the decline of grain size and rise of relative density. The yield strength of nanoporous silver materials (2.55 MPa) with relative density 28.78% at the grain size of 42.1 nm was 2.16 times higher than that of nanoporous silver materials (1.18 MPa) with relative density 15.45% at the grain size of 48.2 nm. This work not only proposes a new way to fabricate nanoporous silver materials, but also reveals the influence of fs laser power on the yield strength of nanoporous silver materials.