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|Title:||Kinetics of β-phase transformation in the heat treatment of FeSi 2- and Fe2Si5-based thermoelectric alloys|
|Authors:||Zhu, T.J. |
|Citation:||Zhu, T.J., Zhao, X.B., Lü, L. (2003-09-01). Kinetics of β-phase transformation in the heat treatment of FeSi 2- and Fe2Si5-based thermoelectric alloys. Philosophical Magazine 83 (25) : 2865-2873. ScholarBank@NUS Repository. https://doi.org/10.1080/1478643031000152834|
|Abstract:||FeSi2- and Fe2Si5-based thermoelectric alloys have been fabricated by melt spinning and levitation melting. It was found that the levitation-melted FeSi2based alloy must be annealed at 800°C for 10 h to complete transformation of the β phase, while an anneal for only 6 h was needed for the melt-spun alloy. On the other hand, annealing the levitation-melted Fe2Si5-based alloy for 4 h was enough to complete β-phase formation, whereas 14 h was required for the melt-spun alloy. Annealing temperature dependence of the Seebeck coefficient showed that the maximum rate of transformation to β phase occurred at about 800°C for all samples. Application of the Johnson-Mehl-Avrami equation revealed that grain-boundary nucleation was predominant in the levitation-melted FeSi2-based alloy (time exponent n = 1.1), while the zero nucleation mechanism was operative in the melt-spun alloy (n = 3.1). For the eutectoid reactions in the Fe 2Si5-based alloys, several kinds of nucleation site were active. However, nuclei formed at grain edges were dominant in the melt-spun alloy since n = 1.6.|
|Source Title:||Philosophical Magazine|
|Appears in Collections:||Staff Publications|
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