| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Metastable Phase Separation and Concomitant Solute Redistribution of Liquid Fe-Cu-Sn Ternary Alloy |
ZHANG Xiao-Mei, WANG Wei-Li, RUAN Ying, WEI Bing-Bo
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| Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072 |
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| Cite this article: |
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ZHANG Xiao-Mei, WANG Wei-Li, RUAN Ying et al 2010 Chin. Phys. Lett. 27 026401 |
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Abstract Liquid Fe-Cu-Sn ternary alloys with lower Sn contents are usually assumed to display a peritectic-type solidification process under equilibrium condition. Here we show that liquid Fe47.5Cu47.5Sn5 ternary alloy exhibits a metastable immiscibility gap in the undercooling range of 51-329 K (0.19TL). Macroscopic phase separation occurs once undercooling exceeds 196 K and causes the formation of a floating Fe-rich zone and a descending Cu-rich zone. Solute redistribution induces the depletion of Sn concentration in the Fe-rich zone and its enrichment in the Cu-rich zone. The primary Fe phase grows dendritically and its growth velocity increases with undercooling until the appearance of notable macrosegregation, but will decrease if undercooling further increases beyond 236 K. The microsegregation degrees of both solutes in Fe and Cu phases vary only slightly with undercooling.
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| Keywords:
64.70.Ja
81.10.Eq
81.30.Fb
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Received: 24 November 2009
Published: 08 February 2010
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