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Superelastic Porous NiTi with Adjustable Porosities Synthesized by Powder Metallurgical Method

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Abstract

The effects of cold compaction pressure, TiH2, and NH4HCO3 on the physical and mechanical properties of porous NiTi fabricated by capsule-free-hot isostatic pressing (CF-HIP) were investigated. The porosities vary from 20 to 48% depending on the pressure. Porous NiTi with as great as 42% porosity and irregular pores can be prepared by the addition of TiH2, whereas 48% porosity and circular pores can be achieved by NH4HCO3 addition. All the porous NiTi fabricated by CF-HIP using these three methods exhibit superelastic behavior that closely matches human bones.

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Acknowledgments

This study was jointly supported by City University of Hong Kong Applied Research Grant (ARG) No. 9667038, National Natural Science Foundation of China No. 50901032, 51101053, Ministry of Education Specialized Research Foundation for Doctoral Program of Universities No. 20094208120003, Hubei Provincial Middle-Young Research Fund Grant no. Q20101010, and Wuhan ChenGuang Research Program Grant no. 201150431134.

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Authors and Affiliations

  1. Ministry-of-Education, Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, People’s Republic of China

    Xiangmei Liu, Shuilin Wu & Z. S. Xu

  2. Department of Physics & Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People’s Republic of China

    Shuilin Wu, C. Y. Chung & Paul K. Chu

  3. Division of Spine Surgery, Department of Orthopaedics and Traumatology, The University of Hong Kong, Pokfulam, Hong Kong, People’s Republic of China

    K. W. K. Yeung

Authors
  1. Xiangmei Liu
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  2. Shuilin Wu
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  3. K. W. K. Yeung
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  4. Z. S. Xu
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  5. C. Y. Chung
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  6. Paul K. Chu
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Corresponding authors

Correspondence to Shuilin Wu or Paul K. Chu.

Additional information

This article is an invited paper selected from presentations at the International Conference on Shape Memory and Superelastic Technologies 2011, held November 6-9, 2011, in Hong Kong, China, and has been expanded from the original presentation.

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Liu, X., Wu, S., Yeung, K.W.K. et al. Superelastic Porous NiTi with Adjustable Porosities Synthesized by Powder Metallurgical Method. J. of Materi Eng and Perform 21, 2553–2558 (2012). https://doi.org/10.1007/s11665-012-0333-x

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  • DOI: https://doi.org/10.1007/s11665-012-0333-x

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