Abstract
The effect of the presence of two different primary phases on the microstructural characteristics and solidification kinetics of Pb-Sn eutectic was analyzed using Fourier thermal analysis method (FTA) and microstructural characterization. Three Pb-Sn alloys, a hypoeutectic, an eutectic, and a hypereutectic alloy, were melted in an electric furnace under an argon atmosphere and poured into sand molds. Cooling curves were obtained and numerically processed using FTA. Microstructural observations of the probes indicate a lamellar morphology for the eutectic microconstituent of the hypereutectic alloy; the eutectic alloy shows the presence of both lamellar and anomalous eutectic and the hypoeutectic alloy shows only the presence of anomalous eutectic. FTA results indicate that in the case of the probes showing the presence of anomalous eutectic, there is a primary eutectic formed during recalescence at high undercooling and a secondary eutectic yielded at low undercooling at the eutectic plateau temperature. This result shows that the cause behind the observed differences in the eutectic morphologies of the experimental alloys lies on the nucleating ability of the primary phase available as a potential substrate for nucleation of the eutectic microconstituent.
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References
B.E. Sundquist; L.F. Mondolfo, Heterogeneous Nucleation in the liquid to solid Transformation in alloys, Transactions of AIME 221, 1961, p157–164.
S.T. Bluni; M.R. Notis; A.R. Merder Nucleation characteristics and microstructure of eutectic Al-Zn alloys. Acta Metallurgica et Materialia 43 (5), 1995,p1775–1782.
De Castro W.B.; Kiminami C.S. Heterogeneous nucleation behavior in undercooled Sn-Bi alloys. Journal of Materials Science Letters 18, 1999, p487–488.
Chu M. G., Shiohara Y., Fleming M. C., Solidification of highly undercooled Pb - Sn alloy droplets, Metallurgical Transactions A, 15A, 1984,p1303 – 1310.
De Groth H.C., Laxmanan V., Bulk undercooling, nucleation and macrosegregation of Pb–Sn alloys, Metallurgical Transactions A, 19A, 1988, p2651 – 2658.
Li J.F.,JIE W.Q., Zhao S and Zhou Y.H. Structural Evidence for the transition fron Coupled to Decoupled Growth in the solidification of Undercooled Ni-Sn Eutectic Melt, Metallurgical and Materials Transactions A, 38A 2007, p1806–1816.
De Castro W.B.; de Lucena M,; Kiminami C.S.; Bolfarini C. Microstructure of undercooled Pb-Sn alloys Materials Science and Engineering A, 304–306 (1–2), 2001,p 255–261
Kang H., Yoon W., Microstructural morphology changes of the lead- tin eutectic alloy by different undercooling levels, Materials Transactions, 10, 2004, p2956–2959.
Kapturkiewicz W.; Burbielko A.; Lopez H.F. A new concept in thermal analysis of castings. AFS Transactions 101, 1993, p505–511.
Barlow J.O.; Stefanescu D.M., Computer aided cooling curve analysis revisited. AFS Transactions,105, 1997, p339–354.
Fras E.; Kapturkiewicz W.; Burbielko A.; Lopez H.F. Numerical Simulation and Fourier Thermal Analysis in High Carbon Fe-C alloys. Metallurgical and Materials Transactions B,28B, 1997, p115–123.
Emadi D.; Whiting L., Determination of solidification characteristics of Al-Si alloys by thermal analysis. AFS Transactions 110, 2002, p285–296.
Goetzinger R., Barth M., and Herlach D.M. Mechanism of Formation of the Anomalous Eutectic Structures in Rapidly Solidified Ni-Si, Co-Sb and Ni-Al-Ti Alloys Acta Materialia, (46),5, 1998,p1647 1655.
Wei B.; Herlach D.M.; Feuerbacher B.; Sommer F. Dendritic and eutectic solidification of undercooled Co-Sb alloys. Acta Metallurgica and Materialia 41 (6), 1993, p1801–1809.
Li M.and Kuribayashi K. Nucleation-Controlled Microstructures and Anomalous Eutectic Formation in Undercooled Co-Sn and Ni-Si Eutectic Melts. Metallurgical and Materials Transactions: A, Vol. 34A, 12; 2003,.p2999 3008
Li M.and Kuribayashi K. Further Discussion on the Free Growth Behavior in the Solidification of Undercooled Eutectic Melts . Metallurgical and Materials Transactions: A Vol. 34A, 6, 2003, p1393–1396
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The authors acknowledge the DGAPA (UNAM) for the financial support and A. Amaro, I. Puente, I. Beltran, and C. Atlatenco for their valuable technical assistance.
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Cruz, H., Ramírez-Argaez, M., Juarez, A. et al. Fourier Thermal Analysis of the Eutectic Formed in Pb-Sn Alloys. J. of Materi Eng and Perform 18, 441–445 (2009). https://doi.org/10.1007/s11665-008-9312-7
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DOI: https://doi.org/10.1007/s11665-008-9312-7