Al-Si alloys is formulated using Butler equation and with the help of Redlich-Kister polynomials, excess Gibbs-free energy of nanoparticles in Al-Si system has been calculated considering particle size as 2 and 10 nm. Calculated results extend the thermodynamic information about the Al-Si system from bulk to nanomaterials. With the decrease of particle diameter, change in thermodynamic properties of the Al-Si system has been observed. Also, reduction in eutectic temperature, eutectic composition, and melting temperature of the constituents were observed. Liquidus and solidus boundaries of Al-Si phase diagram are also shift towards the lower temperature.
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