• REFERENTS:
  RADA NOVAKOVIC
  

• UNITS:
  GENOA

The aim is to increase the basic understanding of the properties and phenomena at the nano-scale length for tailoring materials by controlling composition and structure, in order to optimize their final properties. In the framework of Actions COST 531 and COST MPO602 some binary and ternary alloys of the Ag-Cu-Sn (SAC) nanosized reference systems and Sn-based alloys with metal nanoparticle (such as Bi, Sb, Co, Ni, Zn, Ge, Ag, Au) additions have been/are studied as Pb-free candidate materials. The alloy catalysts (Ag-Pd, Mg-Pd, Cu-Pd, Cu-Pt, Ni-Pt,..) and biomedical alloys (Ag-Au, Ag-Cu, Co-Cr, Ni-Ti, Ti-Al-V). have been/are investigated last few years (Action COST MPO903). The models and methods relevant for optimization and design of the aforementioned alloy systems have been developed in the framework of thermodynamics, kinetics and statistical mechanics can be summarized as: CALPHAD method for calculations of bulk and nano-sized phase diagrams, thermodynamic models for prediction of the surface (surface energy, segregation, gas adsorption), transport (diffusivity, viscosity, compressibility, el. resistivity) and structural (the concentration-concentration fluctuations in the long wavelength limit and the Waren-Cowley short-range order parameter) properties of the liquid or/and solid phases as well as the melting temperature depression and shift of invariant reactions in small systems with a decrease in particle size and coalescence (surface diffusion and/or Ostwald ripening).