Nanostructured metals often fail after minimal uniform deformation due to flow localization. I will describe an effort to create metal nanocomposites that resist flow localization by engineering the morphology of their microstructure via solid metal dealloying. By varying the compositions and thermal processing histories of these materials, we generate a range of complex nanocomposites with different microstructural length scales, microstructure morphologies, and phase connectivities. We then investigate the effect of these features on the hardness and flow localization in these nanocomposites using nanoindentation. This work screens a wide range of microstructures, providing design criteria for nanostructured materials that undergo large-scale, uniform plastic deformation.