Predictions of the Al-rich region of the Al-Co-Ni-Y system based upon first-principles and experimental data

A thermodynamic database has been produced for the Al-Co-Ni-Y quaternary system, with an emphasis on the Al-rich region of the Al-Ni-Y ternary system. The database was created using the CALPHAD method, combining existing binary systems with relevant experimental and first-principles information for selected Al-Ni-Y and Co-containing compounds. The thermodynamic database was used to produce equilibrium and non-equilibrium Scheil simulations to determine the phases present in Al-Co-Ni-Y alloys. The values for the Scheil simulation show good agreement, when compared with experimentally determined phase fractions of intermetallic particles dispersed in an Al matrix for three Al-rich quaternary alloys.