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A Comparative Study on the Mechanical Behavior of Porous Titanium and NiTi Produced by a Space Holder Technique

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Abstract

NiTi and Ti porous specimens with appropriate pore characteristics for biomedical applications are produced by space holder method. Porosities of the specimens linearly increase from 14 to 65 and 42 to 70% for the Ti and NiTi specimens, respectively, with the urea space holder. Mechanical properties such as stiffness, fracture strain, and strength of the porous NiTi and Ti are adjustable with pore characteristics. The apparent elasticity modulus of NiTi specimens decrease from 3.5 to 0.73 GPa as porosity increases. Since the initial linear part of the stress-strain curve consists of elastic behavior, formation of stress-induced martensite, deformation and/or detwinning of martensite variants, and plastic deformation, the unloading slope of stress-strain curves is a better approximation for the elasticity modulus of the NiTi porous specimens as it is proved by an isotropic cubic cell model. The unloading slope of the NiTi specimen with 61% porosity is 3.1 GPa, while the apparent elasticity or loading slope is 0.85 GPa. In comparison to Ti, the high, recoverable strain of NiTi improves capability of it as a good candidate for bone replacement. Moreover, in contrast to Ti specimens, hysteresis loops are clearly observed in the stress-strain curves of NiTi specimens.

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Acknowledgments

The authors would like to thank Eng. Abedi and the staff from the School of Metallurgy and Material Engineering of the University of Tehran for their support in performing mechanical experiments.

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Authors and Affiliations

  1. Materials and Energy Research Center, P.O. Box 14155-4777, Tehran, Iran

    S. A. Hosseini, R. Yazdani-Rad, A. Kazemzadeh & M. Alizadeh

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  1. S. A. Hosseini
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  2. R. Yazdani-Rad
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  3. A. Kazemzadeh
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  4. M. Alizadeh
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Correspondence to S. A. Hosseini.

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Hosseini, S.A., Yazdani-Rad, R., Kazemzadeh, A. et al. A Comparative Study on the Mechanical Behavior of Porous Titanium and NiTi Produced by a Space Holder Technique. J. of Materi Eng and Perform 23, 799–808 (2014). https://doi.org/10.1007/s11665-013-0810-x

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  • DOI: https://doi.org/10.1007/s11665-013-0810-x

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