Abstract
In this paper, the effects of grain size on the Young’s modulus and hardness of nanocrystalline NiTi are investigated by macroscopic isothermal tension and microscopic nanoindentation. Amorphous NiTi with nanocrystalline debris is fabricated through 50% thickness reduction cold-rolling. Polycrystalline NiTi with average grain size of 10–100 nm are obtained by annealing and subsequent water quenching. It’s shown that as the grain size decreases in the nano region (below 100 nm), hardness of the nanocrystalline NiTi consistently increase but the change of modulus is non-monotonic with a minimum value at around 60 nm.
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Acknowledgements
The financial support from the Hong Kong Research Grants Council through Project No. N_HKUST 617/14 and the National Science Foundation of China through Project No. 11532010 is gratefully acknowledged. Technical assistance from the Materials Characterization and Preparation Facility (MCPF) of the Hong Kong University of Science and Technology is highly appreciated.
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Xia, M., Liu, P., Sun, Q. (2017). Grain Size Effects on Young’s Modulus and Hardness of Nanocrystalline NiTi Shape Memory Alloy. In: Sun, Q., Matsui, R., Takeda, K., Pieczyska, E. (eds) Advances in Shape Memory Materials. Advanced Structured Materials, vol 73. Springer, Cham. https://doi.org/10.1007/978-3-319-53306-3_15
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DOI: https://doi.org/10.1007/978-3-319-53306-3_15
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