Abstract
A direct-current-assisted (DC-assisted) healing method is proposed to deal with the functional degradation of nanocrystalline superelastic NiTi shape memory alloys. Based on microstructural observation, we clarify that DC-assisted healing is mainly attributable to the elimination of residual martensite and transformation-induced dislocations via Joule effect. The proposed healing strategy is suitable for nanocrystalline samples with small grain size (less than ~ 30 nm) and high initial dislocation density (~1 × 1016 m−2), and the appropriate healing parameters are determined.
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Acknowledgments
Y. Xiao and S. Ju are sponsored by Shanghai Sailing Program and the Fundamental Research Funds for the Central Universities. Y. Xiao and C. Fang are supported by Tongji University Interdisciplinary Joint Research Project. J. Lin is grateful to the National Natural Science Foundation of China (Grant No. 52075390).
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Ju, S., Xiao, Y., Lin, J. et al. Direct-Current-Assisted Healing for Functional Degradation of Nanocrystalline Superelastic NiTi Shape Memory Alloys. Metall Mater Trans A 54, 4625–4633 (2023). https://doi.org/10.1007/s11661-023-07226-2
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DOI: https://doi.org/10.1007/s11661-023-07226-2