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250 °C isothermal section of ternary Sn-In-Cu phase equilibria

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Abstract

Ternary Sn-In-Cu alloys are prepared and equilibrated at 250 °C for 2 to 20 weeks. The phases formed in these alloys are experimentally determined. The 250 °C Sn-In-Cu isothermal section is established according to the phase equilibrium information obtained in this study and that of the three constituent binary systems. It has eight single-phase regions, namely liquid, δ1-Cu41Sn11, ε-Cu3Sn, δ2-Cu7In3, η-(Cu6Sn5 Cu2In), Cu11In9, Cu2In3Sn, and α-(Cu) phases, 14 two-phase regions, and seven three-phase regions. In the Sn-In-Cu system at 250 °C, the η-Cu6Sn5 and η-Cu2In phases form a continuous solid solution and the ternary Cu2In3Sn compound is observed. The δ1-Cu41Sn11 phase is stabilized at 250 °C with the introduction of indium although it transforms into α-(Cu) and ε-Cu3Sn phases via a eutectoid reaction around 350 °C in the binary Sn-Cu system. Except for the Cu11In9 phase and the Cu2In3Sn ternary compound, the other binary compounds all have significant indium and tin mutual solubilities.

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Authors and Affiliations

  1. Department of Chemical Engineering, National Tsing Hua University, Hsin-chu, 300, Taiwan

    Shih-kang Lin, Ting-ying Chung, Sinn-wen Chen & Chih-horng Chang

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  1. Shih-kang Lin
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  2. Ting-ying Chung
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Correspondence to Sinn-wen Chen.

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Lin, Sk., Chung, Ty., Chen, Sw. et al. 250 °C isothermal section of ternary Sn-In-Cu phase equilibria. Journal of Materials Research 24, 2628–2637 (2009). https://doi.org/10.1557/jmr.2009.0317

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  • DOI: https://doi.org/10.1557/jmr.2009.0317

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