Abstract
The properties of widely used Ni–Ti-based shape memory alloys (SMAs) are highly sensitive to the underlying microstructure. Hence, controlling the evolution of microstructure during high-temperature deformation becomes important. In this article, the “processing maps” approach is utilized to identify the combination of temperature and strain rate for thermomechanical processing of a Ni42Ti50Cu8 SMA. Uniaxial compression experiments were conducted in the temperature range of 800–1050 °C and at strain rate range of 10−3 and 102 s−1. Two-dimensional power dissipation efficiency and instability maps have been generated and various deformation mechanisms, which operate in different temperature and strain rate regimes, were identified with the aid of the maps and complementary microstructural analysis of the deformed specimens. Results show that the safe window for industrial processing of this alloy is in the range of 800–850 °C and at 0.1 s−1, which leads to grain refinement and strain-free grains. Regions of the instability were identified, which result in strained microstructure, which in turn can affect the performance of the SMA.
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References
K. Otsuka and C.M. Wayman: Shape Memory Materials (Cambridge University Press, MA, 1998).
K. Otsuka and X. Ren: Physical metallurgy of Ti Ni based shape memory alloys. Prog. Mater. Sci. 50, 511–678 (2005).
T.W. Duerig, A.R. Pelton, and D. Stockel: An overview of nitinol medical applications. Mater. Sci. Eng., A 273–, 149 (1999).
A.R. Pelton, D. Stockel, and T.W. Duerig: Medical uses of nitinol. Mater. Sci. Forum 327–, 63 (2000).
Z.D. Cui, H.C. Man, F.T. Cheng, and T.M. Yue: Cavitation erosion–corrosion characteristics of laser surface modified NiTi shape memory alloy. Surf. Coat. Tech. 162, 147 (2003).
P. Rocher, L. El Medawar, J.C. Hornez, M. Traisnel, J. Breme, and H.F. Hildebrand: Biocorrosion and cytocompatibility of NiTi shape memory alloys. Scr. Mater. 50, 255 (2004).
R.D. Jean and J.C. Tsai: Effect of hot working on the martensitic transformation of Ni-Ti alloys. Scr. Metall. Mater. 30, 1027 (1994).
I. Karaman, H. Ersin Karaca, Z.P. Luo, and H.J. Maier: The effect of severe marforming on shape memory characteristics of a Ti rich NiTi alloy processed using equal channel angular extrusion. Metall. Mater. Trans. A 34, 2527 (2003).
T. Kurita, H. Matsumoto, and H. Abe: Transformation behavior in rolled NiTi. J. Alloy. Comp. 381, 158 (2004).
D. Favier, Y. Liu, L. Orgeas, A. Sandel, L. Debove, and P. Comte-Gaz: Influence of thermomechanical processing on the superelastic properties of a Ni-rich nitinol shape memory alloy. Mater. Sci. Eng., A 429, 130 (2006).
N.N. Popov, S.D. Prokoshkin, M.Yu. Sidorkin, T.I. Sysoeva, D.V. Borovkov, A.A. Aushev, I.V. Kostylev, and A.E. Gusarov: Effect of thermomechanical treatment on the structure and functional properties of a 45Ti-45Ni-10Nb alloy. Russ. Metall. 1, 59 (2007).
B. Kockar, I. Karaman, A. Kulkarni, Y. Chumlyakov, and I.V. Kireeva: Effect of severe ausforming via equal channel angular extrusion on the shape memory response of a NiTi alloy. J. Nucl. Mater. 361, 298 (2007).
S.K. Sadrnezhaad and S.H. Mirabolghasemi: Optimum temperature for recovery and recrystallization of 52Ni48Ti shape memory alloy. Mater. Des. 28, 1945 (2007).
A.S. Paula, K.K. Mahesh, and F.M.B Fernandes: Evolution of phase transformations after multiple steps of marforming in Ti- rich Ni-Ti SMA. Eur. Phys. J. Spec. Top. 158, 45 (2008).
A.S. Paula, K.K. Mahesh, C.M.L.D Santos, F.M.B Fernandes and C.S.D.C Viana: Thermomechanical behavior of Ti-rich NiTi shape memory alloys. Mater. Sci. Eng., A 481–, 146 (2008).
H.C. Lin and S.K. Wu: Effects of hot rolling on the martensitic transformation of an equiatomic Ti-Ni alloy. Mater. Sci. Eng., A 158, 87 (1992).
H.G. Suzuki, E. Takakura, and D. Eylon: Hot strength and hot ductility of titanium alloys—a challenge for continuous casting process. Mater. Sci. Eng., A 263, 230 (1999).
C.P. Frick, A.M. Ortega, J. Tyber, A.El.M. Maksound, H.J. Maier, Y. Liu, and K. Gall: Thermal processing of polycrystalline NiTi shape memory alloys. Mater. Sci. Eng., A 405, 34 (2005).
K. Dehghani and A.A. Khamei: Hot deformation behavior of 60Nitinol (Ni60 wt%–Ti40 wt%) alloy: Experimental and computational studies. Mater. Sci. Eng., A 527, 684 (2010).
A.A. Khamei and K. Dehghani: Modeling the hot-deformation behavior of Ni60 wt%–Ti40 wt% intermetallic alloy. J. Alloy. Comp. 490, 377 (2010).
M. Morakabati, Sh. Kheirandish, M. Aboutalebi, A. Karimi Taheri, and S.M. Abbasi: The effect of Cu addition on the hot deformation behavior of NiTi shape memory alloys. J. Alloy. Comp. 499, 57 (2010).
K.N. Melton and O. Mercier: Deformation behaviour of NiTi alloys. Metall. Trans. A 9, 1487 (1978).
T.H. Nam, T. Saburi, Y. Kawamura, and K. Shimizu: Shape memory characteristics associated with the B2↔B19 and B19↔B19’ transformations in a Ti-40Ni-10 Cu (at.%) alloy. Mater. Trans. JIM 31, 262 (1990).
T.H. Nam, T. Saburi, and K. Shimizu: Cu-content dependence of shape memory characteristics in Ti-Ni-Cu alloys. Mater. Trans. JIM 31, 959 (1990).
T.H. Nam, T. Saburi, Y. Nakata, and K. Shimizu: Shape memory characteristics and lattice deformation in Ti-Ni-Cu alloys. Mater. Trans. JIM 31, 1050 (1990).
T.H. Nam, T. Saburi, and K. Shimizu: Effect of thermo-mechanical treatment on shape memory characteristics in a Ti-40Ni-10Cu (at%) alloy. Mater. Trans. JIM 32, 814 (1991).
Y.C. Lo, S.K. Wu, and H.E. Horng: A study of B2↔B19↔B19′ two-stage martensitic transformation in a Ti50Ni40Cu10 alloy. Acta Metall. Mater. 41, 747 (1993).
W. Tang, R. Sandstrom, Z.G. Wei, and S. Miyazak: Experimental investigation and thermodynamic calculation of the Ti-Ni-Cu shape memory alloys. Metall. Mater. Trans. A 31, 2423 (2000).
F.J. Gil, E. Solano, J. Penal, E. Engel, A. Mendoza, and J.A. Planell: Microstructural, mechanical and cytotoxicity evaluation of different NiTi and NiTiCu shape memory alloys. J. Mater. Sci.- Mater. Med. 15, 1181 (2004).
S. Colombo, C. Cannizzo, F. Gariboldi, and G. Airoldi: Electrical resistance and deformation during the stress-assisted two-way memory effect in Ni45Ti50Cu5 alloy. J. Alloy. Comp. 422, 313 (2006).
Ch. Grossmann, J. Frenzel, V. Samphath, T. Depka, and G. Eggeler: Elementary transformation and deformation processes and the cyclic stability of NiTi and NiTiCu shape memory spring actuators. Metall. Mater. Trans. A 40, 2530 (2009).
I. Sen and U. Ramamurty: High-temperature (1023 K to 1273 K [750 °C to 1000 °C]) plastic deformation behavior of B-modified Ti-6Al-4V alloys: Temperature and strain rate effects. Metall. Mater. Trans. A 41, 2959 (2010).
R.L. Goetz and S.L. Semiatin: The adiabatic correction factor for the deformation heating during the uniaxial compression test. J. Mater. Eng. Perform. 10, 710 (2001).
Y.V.R.K Prasad and S. Sasidhara: Hot Working Guide (ASM International, Materials Park, OH, 1997).
P.L. Charpentier, B.C. Store, S.C. Earnest, and J.F. Thomas Jr.: Characterization and modeling of the high temperature flow behavior of aluminum alloy 2024. Metall. Trans. A 17, 2227 (1986).
S.I. Oh, S.L. Semiatin, and J.J. Jonas: An analysis of the isothermal hot compression test. Metall. Trans. A 23, 963 (1992).
A.K. Mukherjee: High temperature creep mechanism of TiNi. J. Appl. Phys. 39, 2201 (1968).
H. Kato, T. Yamamoto, S. Hashimoto, and S. Miura: High-temperature plasticity of the β-phase in nearly-equiatomic nickel-titanium alloys. Mater. Trans. JIM 40, 343 (1999).
Y.V.R.K Prasad: Recent advances in the science of mechanical processing. Indian J. Technol. 28, 435 (1990).
I. Sen, R.S. Kottada, and U. Ramamurty: High temperature deformation processing maps for boron modified Ti–6Al–4V alloys. Mater. Sci. Eng., A 527, 6157 (2010).
E.M. Lehockey, Y.P. Lin, and O.E. Lepik: Mapping residual plastic strain in materials using electron backscatter diffraction, in Electron Backscatter Diffraction in Materials Science, edited by A.J. Schwartz, M. Kumar, and B.L. Adams (Kluwer Academic/Plenum Publishers, New York, 2000), pp 247–264.
V. Randle and O. Engler: Introduction to Texture Analysis—Macrotexture, Microtexture and Orientation Mapping (CRC Press, Boca Raton, FL, 2000), pp 245–261.
Acknowledgments
The authors acknowledge financial support by Rolls–Royce Plc and The Boeing Company for this work. The authors are also thankful to S. Sasidhara and K. Rajasimha for their assistance in conducting the compression experiments, K. Shyamprasad for his help in writing the code that is used for the processing maps, and R. Basu for conducting the EBSD scans at the National Facility (OIM and x-ray bulk texture) at IIT-B under the guidance of I. Samajdar. Technical discussions with Y.V.R.K. Prasad, R.S. Kottada, I. Sen, and K. Suresh, which helped this work in many ways, are gratefully acknowledged.
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Shastry, V.V., Maji, B., Krishnan, M. et al. High-temperature deformation processing maps for a NiTiCu shape memory alloy. Journal of Materials Research 26, 2484–2492 (2011). https://doi.org/10.1557/jmr.2011.257
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DOI: https://doi.org/10.1557/jmr.2011.257