Scholars@Duke publication: Entropy of the γ- α martensitic transformation in Fe <inf>71</inf>Ni<inf>29</inf>

Entropy of the γ- α martensitic transformation in Fe 71Ni29

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Delaire, O; Kresch, M; Fultz, B

Published in: Proceedings of an International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005

December 1, 2005

The low-temperature martensitic phase transformation in FeriNija was studied by x-ray diffractometry, differential scanning calorimetry and inelastic neutron scattering. From inelastic neutron scattering spectra, the phonon density of states of the high-temperature austenite and low-temperature martensite were obtained, showing a substantial stiffening in the martensite phase. The change in vibrational entropy associated with this stiffening was found to be ΔSvibγ→α= -0.12 ±0.02 kB atom-1. The forward and reverse transformations occur at different temperatures and the total entropies of transformation were measured by differential scanning calorimetry for both. From these measurements and published magnetization results for this alloy, it is found that the change in magnetic entropy is twice as large as the phonon contribution in the reverse martensitic transformation, accounting for the inequality of the total entropies of the forward and reverse transformations.

Duke Scholars

Author Olivier Delaire Thomas Lord Department of Mechanical Engineering and Materia ...

Published In

Proceedings of an International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005

Publication Date

December 1, 2005

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Start / End Page

75 / 80

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Delaire, O., Kresch, M., & Fultz, B. (2005). Entropy of the γ- α martensitic transformation in Fe 71Ni29. In Proceedings of an International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 (Vol. 2, pp. 75–80).

Delaire, O., M. Kresch, and B. Fultz. “Entropy of the γ- α martensitic transformation in Fe 71Ni29.” In Proceedings of an International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005, 2:75–80, 2005.

Delaire O, Kresch M, Fultz B. Entropy of the γ- α martensitic transformation in Fe 71Ni29. In: Proceedings of an International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005. 2005. p. 75–80.

Delaire, O., et al. “Entropy of the γ- α martensitic transformation in Fe 71Ni29.” Proceedings of an International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005, vol. 2, 2005, pp. 75–80.

Delaire O, Kresch M, Fultz B. Entropy of the γ- α martensitic transformation in Fe 71Ni29. Proceedings of an International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005. 2005. p. 75–80.

Published In

Proceedings of an International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005