Abstract
We report recent progress in tailoring the thermal expansion (TE) of nanocrystalline (NC) NiTi by microstructure hierarchical design and control without composition change. Fabrication and characterization methods are outlined and preliminary results of both experiment and mechanism-based modeling are presented to understand and get insight into the unusual TE phenomena. The important roles of the intrinsic thermal expansion anisotropy of B19′ lattice and the suppression of phase transition by the extrinsic fabricated microstructure (cold rolling and annealing, grain size, defects, textures and volume fractions of nanoscaled B2 and B19′ lattices) in the overall macroscopic TE behaviors of the superelastic NC NiTi polycrystal SMAs are emphasized.
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Acknowledgement
The authors are grateful to the financial support from the Hong Kong Research Grants Council (Project No. 16209817) and the Natural Science Foundation of China (Project No. 11532010) to the work of this paper.
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Sun, Q., Yu, C. & Kang, G. Negative and Zero Thermal Expansion NiTi Superelastic Shape Memory Alloy by Microstructure Engineering. Shap. Mem. Superelasticity 4, 158–164 (2018). https://doi.org/10.1007/s40830-018-0151-6
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DOI: https://doi.org/10.1007/s40830-018-0151-6