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Thermal analysis of the ω nanophase transformation from the metastable β Ti–12Mo alloy

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Abstract

In this study, the thermal analysis of the ω nanophase transformation from a quenched metastable β Ti–12Mo alloy composition (mass%) was investigated by electrical resistivity and dilatometry measurements. The activation energy was observed to be 121 ± 20 kJ mol−1 (from resistivity measurements) and 114 ± 12 kJ mol−1 (from dilatometry measurements) during the early stage of the transformation process. The kinetic of the ω nanophase transformation was modelized by using the classical Johnson–Mehl–Avrami (JMA) theory and a modified Avrami (MA) analysis. An Avrami exponent close to 1.5 was found at the early stage of the transformation suggesting a pure growth mechanism from pre-existing nucleation sites. Nevertheless, it was observed a decrease of the Avrami exponent to 0.5 at higher transformed fraction demonstrating a dimension loss in the growth mechanism due to the existence of the high misfit strain at the interface β/ω.

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Acknowledgements

This study was supported by China Scholarship Council (CSC) and INSA-Rennes (France) in the framework of UT-INSA project (2006–2009).

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  1. INSA Rennes, UMR CNRS 6226 Sciences Chimiques de Rennes/Chimie-Métallurgie, 20 avenue des Buttes de Coësmes, Rennes, 35043, France

    Fan Sun, Denis Laillé & Thierry Gloriant

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  1. Fan Sun
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  2. Denis Laillé
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  3. Thierry Gloriant
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Correspondence to Thierry Gloriant.

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Sun, F., Laillé, D. & Gloriant, T. Thermal analysis of the ω nanophase transformation from the metastable β Ti–12Mo alloy. J Therm Anal Calorim 101, 81–88 (2010). https://doi.org/10.1007/s10973-010-0713-0

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  • DOI: https://doi.org/10.1007/s10973-010-0713-0

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