Abstract
The superelastic material Nitinol, a nearly equiatomic alloy of nickel and titanium, is rapidly becoming one of the most important metallic implant materials in the biomedical industry, especially for the fabrication of endovascular stents. The manufacture of these stents, and countless other Nitinol products, originates from various forms of raw material such as tube, sheet or rod. However, depending upon which product form is used, the crystallographic texture in Nitinol can be significantly different, which can lead to marked changes in its mechanical properties. In this paper, we present a study to show the characteristic texture in various Nitinol product forms (tube, sheet, and rod), before and after annealing heat treatments, with specific quantification of the major texture components. We further present predictions of the mechanical response based upon such texture, and provide experimental verification with uniaxial tensile tests. Results show that the form of the starting material has a profound influence on characteristic texture and predicted mechanical response. Furthermore, annealing heat treatments, rather than reducing the texture, are found to increase the strength of this texture.
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References
L. A. MONASEVICH, Y. I. PASKAL, V. E. PRIB, G. D. TIMONIN and D. B. CHERNOV, Met. Sci. Heat Treat. 21 (1979) 735.
D. Y . LI, X. F. WU and T. KO, Acta Metall. Mater. 38 (1990) 19.
J. H . MULDER, P. E. THOMA and J . BEYER, Z. Metallkd. 84 (1993) 501.
H. INOUE, N. MIWA and N. INAKAZU, Acta Mater. 44 (1996) 4825.
K. KITAMURA, S. MIYAZAKI, H. IWAI and M. KOHL, in the Proceedings of the Second International Shape Memory and Superelastic Technologies Conference, Asilomar, edited by A. R. Pelton, D. E. Hodgson, S. M. Russell and T. W. Duerig, CA, USA, March 1997, p. 47.
Y. C. SHU and K. BHATTACHARYA, Acta Mater. 46 (1998) 5457.
K. GALL and H. SEHITOGLU, Int. J. Plasticity 15 (1999) 69.
W. Q. YUAN and S. YI, Mater. Sci. Eng. A 271 (1999) 439.
R. VAIDYANATHAN, M. A. M. BOURKE and D. C. DUNAND, Metall. Mater. Trans. A 32A (2001) 777.
E. HORNBOGEN, G. BRUCKNER and G. GOTTSTEIN, Z. Metallkd. 93 (2002) 3.
H. SITEPU, W. SCHMAHL and B. VON DREELE, Appl. Phys. A 74 (2002) S1676.
J. M. MCNANEY, V. IMBENI, Y. JUNG, P. PAPADOPOULOS and R. O. RITCHIE, Mech. Mater. 35 (2003) 969.
S. GAO and S. YI, Mater. Sci. Eng. A362 (2003) 107.
S. W. ROBERTSON, V. IMBENI, H. R. WENK and R. O. RITCHIE, in Proceedings of the Shape Memory and Superelastic Technologies Conference (Baden-Baden, Germany, 2004) in press.
S. MATTHIES and G. W. VINEL, Phys. Stat. Sol. B 112 (1982) K111.
H. R. WENK, S. MATTHIES, J. DONOVAN and D. CHATEIGNER, J. Appl. Cryst. 31 (1998) 262.
U. F. KOCKS, C. N. TOME and H. R. WENK in “Texture and Anisotropy” (Cambridge University Press, 1998) p. 195.
C. P. FRICK, A. M. ORTEGA, J. TYBER, K. GALL and H. J. MAIER, Metall. Mater. Trans. A 35A (2004) 2013.
N. ONO and A. SATO, Trans. Jpn. Inst. Metals 29 (1988) 267.
N. ONO, A. SATOH and H. OHTA, ibid. 30 (1989) 756.
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Robertson, S.W., Gong, X.Y. & Ritchie, R.O. Effect of product form and heat treatment on the crystallographic texture of austenitic Nitinol. J Mater Sci 41, 621–630 (2006). https://doi.org/10.1007/s10853-006-6478-y
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DOI: https://doi.org/10.1007/s10853-006-6478-y