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High-porosity NiTi superelastic alloys fabricated by low-pressure sintering using titanium hydride as pore-forming agent

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Abstract

Porous NiTi shape memory alloys (SMAs) were successfully fabricated by low-pressure sintering (LPS), and the pore features have been controlled by adjusting the processing parameters. The porous NiTi SMAs with high porosity (45%) and large pore size (200–350 μm) can be prepared by LPS using TiH1.5 as pore-forming agent. These alloys exhibit isotropic pore structure with three-dimensional interconnected pores. The porous NiTi SMA produced by LPS exhibits superelasticity and mechanical properties superior to that by conventional sintering.

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Acknowledgements

The authors acknowledge the support from National Natural Science Foundation of China (No.50701019), China Postdoctoral Science Foundation (No. 20060390199), the Ministry of Education (Project No IRT0551), Guangdong Provincial Natural Science Foundation (2005 Team project), and City University of Hong Kong Grant (Project No.7002215).

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Authors and Affiliations

  1. School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, People’s Republic of China

    H. Li, B. Yuan, Y. Gao & M. Zhu

  2. Department of Physics & Materials Science, City University of Hong Kong, Kowloon, Hong Kong

    C. Y. Chung

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  1. H. Li
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  2. B. Yuan
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  3. Y. Gao
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  4. C. Y. Chung
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  5. M. Zhu
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Correspondence to M. Zhu.

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Li, H., Yuan, B., Gao, Y. et al. High-porosity NiTi superelastic alloys fabricated by low-pressure sintering using titanium hydride as pore-forming agent. J Mater Sci 44, 875–881 (2009). https://doi.org/10.1007/s10853-008-3193-x

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  • DOI: https://doi.org/10.1007/s10853-008-3193-x

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