Strain development in nanoporous metallic foils formed by dealloying
Abstract
Nanoporous Au foils were formed by dealloying a Ag-Au alloy in concentrated HNO3. The resultant foils, which have a "spongelike" morphology with interconnecting ligaments, were studied using synchrotron-based diffraction. A three-dimensional visualization of the nanostructure is generated from small angle experiments and the lattice parameter is derived from diffraction. The data show the development of two interspersed nanoscale strained regions within the material: one in significant tension and one in compression. We interpret this by considering regions of high positive and negative curvatures in the material; this curvature decreases with increasing pore size resulting in a relaxation in lattice strain.
- Publication:
-
Applied Physics Letters
- Pub Date:
- January 2008
- DOI:
- 10.1063/1.2838351
- Bibcode:
- 2008ApPhL..92d3118S
- Keywords:
-
- 81.40.Jj;
- 62.40.+i;
- 78.70.Ck;
- 61.43.Gt;
- Elasticity and anelasticity stress-strain relations;
- Anelasticity internal friction stress relaxation and mechanical resonances;
- X-ray scattering;
- Powders porous materials