Abstract
The impact of Cu doping on the martensitic transformation and shape memory properties of a high-temperature shape memory alloy system, Ti31.5Hf15Zr5Ni48.5−xCux (x = 0, 5, 10, 15, 20), was investigated. Both the martensitic transformation temperature (Ms) and the transformation enthalpy decrease monotonically with increasing Cu content x, while the recoverable strain exhibits a saddle curve with a minimum value at x = 10. These Cu content-dependent behaviors were attributed to the constraint effect caused by the different size distribution of Ti2Ni-like second phases. Additionally, a scaled linear relationship between Ms and several elemental features, including the modified valence electron concentration, electronegativity, and atomic volume, was established to describe the Cu content dependence of Ms across various Cu-containing TiNi-based systems. The experimental results presented herein, along with the proposed functional form, offer insights for the design of Cu-containing shape memory alloys.
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The authors gratefully acknowledge the support of the National Natural Science Foundation of China (Nos. 52173228, 52271190 and 51931004).
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Pang, J., Dang, P., Tian, J. et al. Effect of Cu content on martensitic transformation and shape memory behavior in Ti31.5Hf15Zr5Ni48.5−xCux alloys. J Mater Sci 59, 11096–11109 (2024). https://doi.org/10.1007/s10853-024-09820-0
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DOI: https://doi.org/10.1007/s10853-024-09820-0