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Redetermination of the Eutectic Composition of the Co-Sn Binary Alloy

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Abstract

A series of Co-Sn alloys was solidified. It was found that the as-cast microstructure of the Co-20.5at.%Sn alloy, which on the basis of literature reports has long been thought to be the eutectic composition, contains much primary phase besides lamellar eutectics. The cooling curve of this alloy contains two exothermic peaks. In contrast, when a Co-24.0at.%Sn alloy was solidified, an entire lamellar eutectic was obtained in the as-cast microstructure. Also, the thermal analyses indicate that there is only one solidification reaction in this alloy. It is suggested that the actual eutectic composition of the Co-Sn system is around Co-24.0at.%Sn, and the corresponding eutectic temperature is about 1385 K.

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Acknowledgment

The financial support from the National Natural Science Foundation of China under Grant No. 50571068 is greatly appreciated.

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Authors and Affiliations

  1. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China

    L. Liu, J. F. Li, S. Zhao & Y. H. Zhou

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  1. L. Liu
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  2. J. F. Li
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  3. S. Zhao
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  4. Y. H. Zhou
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Correspondence to J. F. Li.

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Liu, L., Li, J.F., Zhao, S. et al. Redetermination of the Eutectic Composition of the Co-Sn Binary Alloy. J. Phase Equilib. Diffus. 30, 242–245 (2009). https://doi.org/10.1007/s11669-009-9504-3

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  • DOI: https://doi.org/10.1007/s11669-009-9504-3

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