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- Title
Phase Equilibria of the Ternary Sn-Zn-Co System at 250°C and 500°C.
- Authors
Wang, Chao-hong; Huang, Sheng-en; Huang, Po-yen
- Abstract
The isothermal sections of the ternary Sn-Zn-Co system (<60 at.% Co) at 250°C and 500°C have been experimentally determined. A series of Sn-Zn-Co alloys of various compositions were prepared and annealed at the respective temperatures to reach phase equilibrium. The equilibrium phases in these alloys were examined metallographically and characterized by electron probe microanalysis and x-ray diffraction. In this system, the ternary solubilities of all the binary Sn-Co and Co-Zn intermetallic compounds (IMCs) are very limited. For the phase equilibria at 250°C, two ternary IMCs, T and T, were found, whose compositions were Sn-25 at.%Zn-25 at.%Co and Sn-15 at.%Zn-41 at.%Co, respectively. For the phase equilibria at 500°C, in addition to the T phase, another ternary IMC, namely T (Sn-18 at.%Zn-37 at.%Co), was also found. Moreover, the phase stability of the T and T phases was investigated at temperatures of 260°C to 400°C in detail. The equilibrium phase was the T phase below 300°C, and changed to the T phase at 400°C. The crystal structures of these three ternary IMCs were also studied. The T phase has a cubic structure ( Pm3m), and the T and T phases are orthorhombic in space group Cmcm and Pnma, respectively.
- Subjects
TIN alloys; PHASE equilibrium; ELECTRON probe microanalysis; TERNARY alloys; ISOTHERMAL processes; X-ray diffraction
- Publication
Journal of Electronic Materials, 2015, Vol 44, Issue 12, p4907
- ISSN
0361-5235
- Publication type
Article
- DOI
10.1007/s11664-015-4084-y