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Microstructural characterization of NiTi shape memory alloy produced by rotary hot forging

Published online by Cambridge University Press:  29 May 2017

P. Rodrigues ,
F. M. Braz Fernandes ,
A. S. Paula ,
J. P. Oliveira ,
S. B. Ribeiro ,
E. N. Texeira  and
N. Schell
P. Rodrigues*
Affiliation:
CENIMAT, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Portugal
F. M. Braz Fernandes
Affiliation:
CENIMAT, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Portugal
A. S. Paula
Affiliation:
Mechanical Engineering and Materials Department-SE-4, Instituto Militar de Engenharia–IME, Brazil Metallurgical Engineering Post-Graduation Program (PPGEM), Universidade Federal Fluminense (UFF), Brazil
J. P. Oliveira
Affiliation:
CENIMAT, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Portugal
S. B. Ribeiro
Affiliation:
Centro Universitário de Volta Redonda – UNIFOA, Brazil
E. N. Texeira
Affiliation:
Centro Universitário de Volta Redonda – UNIFOA, Brazil
N. Schell
Affiliation:
HZG, Geesthacht, Germany
*
a)Author to whom correspondence should be addressed. Electronic mail: pf.rodrigues@campus.fct.unl.pt
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Abstract

The thermomechanical processing of NiTi shape memory alloys usually involves several steps of hot and/or cold deformation. The present work presents the structural characterization of a Ni-rich NiTi alloy bar, produced by vacuum-induced melting and thermomechanical processing in laboratory scale, aiming at massive production in the future. This study focused on the first step of hot working at 800 °C during rotary forging. Microstructural characterization was performed using differential scanning calorimetry, high- and low-temperature X-ray diffraction (XRD) using a laboratory source and synchrotron XRD. Thus, it was possible to obtain the phase transformation characteristics of the material: the transformation temperatures and the transformation sequence. Proposed thermomechanical processing is intended for production of bars and wires that will be subsequently drawn to get thin wires, for different applications, including orthodontic arch wires.

Keywords

rotary hot forgingX-ray diffractionphase transformationNiTi alloymicrostructural characterization
Type
Technical Articles
Information
Powder Diffraction , Volume 32 , Supplement S1 , September 2017 , pp. S201 - S206
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Copyright
Copyright © International Centre for Diffraction Data 2017 

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References

Chu, C. L., Wu, S. K., and Yen, Y. C. (1996). “Oxidation behavior of equiatomic TiNi alloy in high temperature air environment,” Mater. Sci. Eng. A 216, 193–200.CrossRefGoogle Scholar
Dehghani, K. and Khamei, A. A. (2010a). “Hot deformation behavior of 60Nitinol (Ni60 wt%–Ti40 wt%) alloy: experimental and computational studies,” Mater. Sci. Eng. A 527, 684–690.CrossRefGoogle Scholar
Dehghani, K. and Khamei, A. A. (2010b). “Modeling the hot-deformation behavior of Ni60 wt%–Ti40 wt% intermetallic alloy,” J. Alloys Compd. 490, 377–381.Google Scholar
Frenzel, J., Zhang, Z., Somsen, C., Neuking, K., and Eggeler, G. (2007). “Influence of carbon on martensitic phase transformations in Niti shape memory alloys,” Acta Mater. 55, 1331–1341.Google Scholar
Frenzel, J., George, E. P., Dlouhy, A., Somsen, Ch., Wagner, M. F.-X., and Eggeler, G. (2010). “Influence of Ni on martensitic phase transformations in NiTi shape memory alloys,” Acta Mater. 58, 3444–3458.Google Scholar
Funakubo, H. (1987). Shape Memory Alloys (Science Publishers, New York, Gordon and Breach), Vol. 1.Google Scholar
Khamei, A. and Dehghani, K. (2010a). “Microstructural evolution during the hot deformation of Ti-55Ni (at. pct) intermetallic alloy,” Metall. Mater. Trans. A 41, 2595–2605.CrossRefGoogle Scholar
Khamei, A. A. and Dehghani, K. (2010b). “A study on the mechanical behavior and microstructural evolution of Ni60 wt%–Ti40 wt% (60Nitinol) intermetallic compound during hot deformation,” Mater. Chem. Phys. 123, 269–277.CrossRefGoogle Scholar
Massalski, T. B., Okamoto, H., Subramanian, P. R., and Kacprzak, L. (Eds.) (1990). Binary Alloy Phase Diagrams (ASM International 2874, Materials Park, OH), 2nd ed., Vol. 3.Google Scholar
Mohd Jani, J., Leary, M., Subic, A., and Gibson, M. A. (2014). “Review: a review of shape memory alloy research, applications and opportunities,” Mater. Des. 56, 1078–1113.CrossRefGoogle Scholar
Morakabati, M., Kheirandisha, Sh., Aboutalebia, M., Karimi Taherib, A., and Abbasic, S. M. (2011a). “A study on the hot workability of wrought NiTi shape memory alloy,” Mater. Sci. Eng. A 528, 5656–5663.Google Scholar
Morakabati, M., Aboutalebi, M., Kheirandish, Sh., Karimi Taheri, A., and Abbasi, S. M. (2011b). “High temperature deformation and processing map of a NiTi intermetallic alloy,” Intermetallics 19, 1399–1404.Google Scholar
Otsuka, K. and Ren, X. (2005). “Physical metallurgy of Ti–Ni-based shape memory alloys,” Prog. Mater. Sci. 516, 669.Google Scholar
Otsuka, K. and Wayman, C. M. (1998). Shape Memory Materials (Cambridge University Press, Cambridge, UK).Google Scholar
Otubo, J., Rigo, O. D., Moura Neto, C., and Mei, P. R. (2006). “The effects of vacuum induction melting and electron beam melting techniques on the purity of NiTi shape memory alloys,” Mater. Sci. Eng. 438–440, 679–682.Google Scholar
Otubo, J., Rigo, O. D., Coelho, A. A., Neto, C. M., and Mei, P. R. (2008). “The influence of carbon and oxygen content on the martensitic transformation temperatures and enthalpies of NiTi shape memory alloy,” Mater. Sci. Eng. A 481–482, 639–642.CrossRefGoogle Scholar
Ramaiah, K. V., Saikrishna, C. N., and Bhaumik, S. K. (2005). “Processing of Ni-Ti Shape Memory Alloy Wires,” Int. Conf. of Smart Materials Structures and Systems 2005:SC141.Google Scholar
Yeom, J.-T., Kim, J. H., Hong, J.-K., Kim, S. W., Park, C.-H., Nam, T. H., and Lee, K.-Y. (2014). “Hot forging design of as-cast NiTi shape memory alloy,” Mater. Res. Bull. 58, 234–238.Google Scholar