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

Published online by Cambridge University Press:  31 January 2011

Shih-kang Lin ,
Ting-ying Chung ,
Sinn-wen Chen  and
Chih-horng Chang
Sinn-wen Chen*
Affiliation:
Department of Chemical Engineering, National Tsing Hua University, Hsin-chu 300, Taiwan
Chih-horng Chang
Affiliation:
Department of Chemical Engineering, National Tsing Hua University, Hsin-chu 300, Taiwan
*
a) Address all correspondence to this author. e-mail: [email protected]
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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.

Keywords

AlloyPhase equilibriaSoldering
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 8 , August 2009 , pp. 2628 - 2637
Copyright
Copyright © Materials Research Society 2009

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