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Effect of electropulsing treatment on the microstructure and superelasticity of TiNi alloy

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Abstract

Cold-rolled TiNi alloy was treated by electropulsing with different process parameters. The superelasticity, electrical resistivity and microstructure evolution of the TiNi alloy were investigated. The recrystallization is found to happen in the cold-rolled TiNi alloys during electropulsing treatment (EPT) processing and it took 9 s to complete the crystallization in the EPT process. In addition, the grain size increases with the charge voltage and the discharge frequency of the electropulse. The maximum superelasticity of 6.94 % is gained when the TiNi alloy is treated by the electropulsing with the frequency of 300 Hz. The short recrystallization time of the alloy is attributed to the acceleration of atomic diffusion and the movement velocity of the grain boundary by electropulsing. This research provides an in-depth understanding of how the electropulsing affects the microstructure and superelasticity of TiNi alloy.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant No. 50571048). The authors would like to express their sincere thanks for the technical assistance from Mr. F.Y.F. Chan, Electron Microscope Unit, The Hong Kong University and Dr. H. Yin, Department of Mechanics, The Hong Kong University of Science and Technology.

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Authors and Affiliations

  1. Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, P.R. China

    R. F. Zhu & G. Y. Tang

  2. Key Laboratory of Advanced Materials of Ministry of Education, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, P.R. China

    R. F. Zhu & G. Y. Tang

  3. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, P.R. China

    S. Q. Shi & M. W. Fu

  4. Department of Physics, Siberian State University of Industry, Novokuznetsk, 654007, Russia

    V. E. Gromov

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  1. R. F. Zhu
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  2. G. Y. Tang
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Correspondence to G. Y. Tang.

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Zhu, R.F., Tang, G.Y., Shi, S.Q. et al. Effect of electropulsing treatment on the microstructure and superelasticity of TiNi alloy. Appl. Phys. A 111, 1195–1201 (2013). https://doi.org/10.1007/s00339-012-7342-3

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  • DOI: https://doi.org/10.1007/s00339-012-7342-3

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