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Nano-indentation modulus and hardness of β-Ti and γ-TiAl phases in Ti–Al–Cr system

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Abstract

Mechanical properties of TiAl base alloys strongly depend on the microstructure. To understand the effect of microstructures on the properties, it is essential to evaluate the properties of constituent phases. In this study, the Young’s modulus and hardness of β-Ti and γ-TiAl phases were measured using nano-indentation method in Ti–Al–Cr ternary system, and their Cr content dependence was examined. In Ti–44Al–4Cr alloy equilibrated at 1373 K, β phase, indented from 001 direction, shows the Young’s modulus of 140 GPa and the hardness of 6.8 GPa. In contrast, γ phase, indented from 001 direction, shows the Young’s modulus of 154 GPa and the hardness of 3.1 GPa. The Young’s modulus of β phase increases with Cr content and the hardness does not depend on Cr content. On the other hand, either the Young’s modulus or hardness of γ phase does not change much with Cr content.

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Data availability

The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

Part of this work was supported by Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), “Material Integration” for revolutionary design system of structural materials.

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Authors and Affiliations

  1. School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 Ookayama Meguro-ku, Tokyo, 152-8552, Japan

    Yotaro Okada, Sota Taniguchi, Ryosuke Yamagata, Hirotoyo Nakashima & Masao Takeyama

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  1. Yotaro Okada
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  2. Sota Taniguchi
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  3. Ryosuke Yamagata
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  4. Hirotoyo Nakashima
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  5. Masao Takeyama
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Correspondence to Yotaro Okada.

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Okada, Y., Taniguchi, S., Yamagata, R. et al. Nano-indentation modulus and hardness of β-Ti and γ-TiAl phases in Ti–Al–Cr system. MRS Advances 6, 183–186 (2021). https://doi.org/10.1557/s43580-021-00046-9

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  • DOI: https://doi.org/10.1557/s43580-021-00046-9

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