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Phase equilibria of the Ag–Sn–Cu ternary system

Published online by Cambridge University Press:  03 March 2011

Yee-wen Yen  and
Sinn-wen Chen
Yee-wen Yen
Affiliation:
Department of Chemical Engineering, National Tsing-Hua University, Hsin-Chu, Taiwan 300, Republic of China
Sinn-wen Chen
Affiliation:
Department of Chemical Engineering, National Tsing-Hua University, Hsin-Chu, Taiwan 300, Republic of China
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Abstract

Phase equilibria of the Ag–Sn–Cu ternary system have been determined experimentally as well as using the calculation of phase diagram (CALPHAD) method. Various Ag–Sn–Cu alloys were prepared to study the isothermal sections of the Ag–Sn–Cu ternary system at 240 and 450 °C. No ternary compounds were found and all the binary compounds had only limited ternary solubility. The ∈1–Cu3Sn phase is a very stable phase. It is in equilibrium with the Ag, ζ–Ag4Sn, ∈2–Ag3Sn, η–Cu6Sn5, and Cu phases at 240 °C, and is in equilibrium with the Ag, ζ, ∈2, L, and δ–Cu4Sn phases at 450 °C. Thermodynamic models of the Ag–Sn–Cu ternary system were developed based on available thermodynamic models of the constituent binary systems without introducing ternary interaction parameters. The isothermal sections at 240 and 450 °C were calculated, and the results were in good agreement with those determined experimentally. In addition to the isothermal sections, stability diagrams of Sn and Cu were calculated as well.

Keywords

Phase equilibriaAlloyElectronic material
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 8 , August 2004 , pp. 2298 - 2305
Copyright
Copyright © Materials Research Society 2004

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