Mechanical Testing of Nanostructured Materials
Nanostructured metals are promising materials for engineering applications due to their high strength. Our research aims to understand the mechanical behavior of these materials and determine the relationship between their microstructure and mechanical properties. Experimental techniques such as nanoindentation and micropillar compression are used to measure the mechanical properties and finite element analyses are utilized to understand the deformation behavior.
Atomic force microscopy image of a nanoindent on a nanocrystalline Cu-Nb alloy thin film  .
A CuTiAg amorphous micropillar before (on the left) and after (on the right) compression under ion irradiation .
Ultra-High Strength and Wear Resistant Nanolayers
Thin film coatings of alternating layers of metals and ceramics provide outstanding hardness and wear resistance. These materials are very promising for functional coating applications such as wear resistant coatings for cutting tools and dies. We combine microstructural and mechanical characterization to improve the performances of these materials.
Microfabrication is a powerful tool for the development of force sensors for mechanical testing and for microspecimen preparation. We use lithography and focused ion beam milling frequently for these purposes.
Additive Manufacturing - 3D Printing
Additive manufacturing provides new opportunities for fast and cost effective manufacturing of custom parts. Understanding mechanical performance of printed parts is critical for the reliable usage of these components in engineering applications. We investigate the effect of different printing approaches and parameters on the mechanical properties of printed parts.
Heat Transfer Enhancement with Nanofluids
Nanofluids are promising heat transfer fluids due to their very high thermal conductivity. Numerical analysis of the convective heat transfer performance of these fluids provides a better understanding about their thermal characteristics, which will enable their utilization in engineering applications.
Comparison of the numerical results with experimental data of Heris et al. (2007). Boundary condition is constant wall temperature. Lines and markers indicate numerical results and experimental data, respectively. Dashed line is the numerical solution neglecting the thermal dispersion (only 1 vol.% case is shown for clarity).