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Phase equilibria of the In–Pd–Sn system were investigated by a combination of key experiments and thermodynamic modeling. Phase equilibria were studied experimentally using scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDX) and X-ray diffraction (XRD) at 500 and 800 °C and Pd content of more than 50 at.%. The calculation of phase equilibria was carried out using the Thermo-Calc® software. Thermodynamic descriptions of the binary systems were accepted from [1–3]. However, the parameters of the (Sn) and beta phases of the In–Sn binary had to be revised to account for the new stability parameters of indium and tin from PURE5. The disordered phases were described using the Muggianu model with assessing the ternary interactions. Good agreement between the calculated phase equilibria and experiment was achieved. [1] C. Jiang et al., Metallurgical and Materials Transactions A, 33 (2002) 3597-3603. [2] S. Cui et al., Intermetallics, 126 (2020) 106945. [3] B.J. Lee et al., Journal of Electronic Materials, 25 (1996) 983-991. Conference materials on the Internet: https://calphad.org/registration-payment-abstract/posters-in-category-calphad-assessments-and-database-development Abstract: https://calphad.org/registration-payment-abstract/content/students/2591/Abstract_CALPHAD_2021_Raimov_Kozimzhon.docx Poster: https://calphad.org/registration-payment-abstract/content/students/2591/Poster_CALPHAD_2021_Raimov_Kozimzhon.pdf
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