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Orientational dependence of Poisson’s ratio in tetragonal γ-TiAl single crystal

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Abstract

The orientational dependence of Poisson’s ratio ν in tetragonal single crystalline γ-TiAl was calculated based on previously measured single crystal elastic constants. Depending on the orientation of the applied stress, ν can be quite isotropic or highly anisotropic when the transverse direction varies. For example, when the stress axis is along the [001] direction, the resulting Poisson’s ratio is a constant independent of the transverse direction; when the stress tensile axis is perpendicular to the \(\left(\overline{1 }01\right)\) crystallographic plane, ν is highly anisotropic, varying from a slightly negative value to more than 0.40.

Graphical abstract

Orientational dependence of Poisson’s ratio ν in γ-TiAl single crystal for a [110] tensile direction at \(T=298 K\). θ is the angle between the [001] crystal axis and the transverse direction.

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Data availability

All data generated during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

I would like to thank Drs. R. B. Schwarz, A. Migliori, S. H. Whang for their help and useful discussions during the elastic constant measurements of γ-TiAl.

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  1. Assembly Materials Characterization Laboratory, Assembly Test & Technology Development, Intel Corporation, CH5-157, 5000 W. Chandler Blvd., Chandler, AZ, 85226-3699, USA

    Yi He

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He, Y. Orientational dependence of Poisson’s ratio in tetragonal γ-TiAl single crystal. MRS Communications 13, 431–437 (2023). https://doi.org/10.1557/s43579-023-00376-9

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