The thermodynamic calculations for the Al-Be and Be-Si binary systems and the Al-Be-Si ternary system are conducted via two steps. In the first step, all of the experimental phase diagram and thermodynamic data available from the literature are critically reviewed, and the binary Al-Be and Be-Si phase diagrams are refined by means of X-ray diffraction (XRD), differential thermal analysis (DTA), optical microscope, and SEM/EDX techniques. Using the experimental data form the literature and the present work, the thermodynamic parameters for the Al-Be and Be-Si binary systems are obtained. In the second step, direct calculation was performed for the ternary system without using any ternary parameter. The calculations show that no excess ternary term is necessary for the thermodynamic description of the ternary system. The liquids projection, isothermal section at 1273K, as well as vertical sections at 94 and 88 wt.% Al, 2 wt.% Be, and 50 at.% Be are calculated and compared with the experimental data from the literature and the present work. The calculated results are in reasonable agreement with the experimental data.
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