Abstract
Why do some materials exhibit shape memory effect while others do not? Taking steel and NiTi, for example, in both materials a martensitic transformation takes place when the temperature is lowered, and a reverse transformation occurs when they are subsequently heated [1–6]. Upon heating, steels normally do not show a well defined shape memory effect while NiTi does. One of the major differences between these two materials is the deformation mechanism. When steel is stressed beyond its yield limit in martensite, dislocations are generated and are responsible for the observed plastic deformation. However, when a martensitic NiTi is stressed beyond its yield limit, a “detwinning” process is responsible for the observed inelastic deformations [7–12]. This inelastic deformation can reach about 6% strain without a significant increase in dislocation density. The critical stress for activating the detwinning process is lower than that for dislocation generation and, owing to an insignificant dislocation process, the associated shape change can be partially or even fully restored through a reverse phase transformation. This phenomenon is widely observed in shape memory alloys (SMAs). What makes SMAs so attractive is their unique combination of various novel properties including the shape memory effect, superelasticity, high damping capacity, good fatigue and wear resistance, high kinetic output per volume and, of significant importance, an excellent biocompatibility of NiTi. As listed in Figure 1, most of these properties are somehow related to the detwinning process.
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References
Kurdjumov, G.V.: The nature of martensitic transformations, Journal of Metals July (1959), 449–453.
Cohen, M: The strengthening of steel, Transactions of the Metallurgical Society of AIME 224 (1962), 638–656.
Winchell, P.G., and Cohen, M.: The strength of martensite, Transactions of the ASM 55 (1962), 347–361.
Wayman, CM.: The growth of martensite since E.C. Bain (1924) — some milestones, Materials Science Forum 56–58 (1990), 1–32.
Olson G.B., and Owen, W.S.: Martensite, ASM International, 1992.
Xie, Z.L., Liu, Y., and Hänninen, H.: Stabilization of retained austenite due to partial martensitic transformations, Acta Metall et Mater. 42 (1994), 4117–4133.
Otsuka K., and Shimizu, K.: Pseudoelasticity and shape memory effects in alloys, International Metals Reviews 31, no. 3 (1986), 93–114.
Otsuka K., and Wayman, CM.: Shape Memory Materials, Cambridge University Press, 1998.
Miyazaki, S., Otsuka, K., and Wayman, CM.: The shape memory mechanism associated with the martensitic transformation in Ti-Ni alloys -I. Self-accommodation., Acta Metall. 37 (1989), 1873–1884.
Miyazaki, S., Otsuka, K., and Wayman, CM.: The shape memory mechanism associated with the martensitic transformation in Ti-Ni alloys — II. Variant coalescence and shape recovery, Acta Metall. 37 (1989), 1885–1890.
Wayman, CM.: Shape memory and related phenomena, Progress in Materials Science 36 (1992), 203–224.
Liu, Y., Xie, Z.L., Van Humbeeck, J., Delaey, L., and Liu, Y.N.: On the deformation of twinned domain in NiTi shape memory alloys, Phil. Mag. A 80 (2000), 1935–1953.
Knowles, K.M., and Smith, D.A.: The crystallography of the martensitic transformation in equiatomic nickel-titanium, Acta Metall. 29 (1981), 101–110.
Liu, Y., Xie, Z.L., Van Humbeeck, J., and Delaey, L.: Effect of texture orientation on the martensite deformation of NiTi shape memory alloy sheet, Acta Mater. 47 (1999), 645–660.
Cross, W.B., Kariotis, A.H., and Stimler, F.J.: NASA CR-1433, 09/1969.
Saburi, T., Tatumi, T., and Nenno, S.: Effects of heat treatment on mechanical behavior of Ti-Ni alloys, J. de Physique 34, Suppl. 12 (1982), C4–261–266.
Liu Y.N., and McCormick, P.G.: Influence of heat treatment on the mechanical behaviour of a NiTi alloy, ISIJ International 29/5 (1989), 417–422.
Liu, Y., Van Humbeeck, J., Stalmans, R., and Delaey, L.: Some aspects of the properties of NiTi shape memory alloy, J. of Alloys and Compounds 247 (1997), 115–121.
Wayman, CM.: Deformation mechanisms and other characteristics of shape memory alloys, in Shape Memory Effects in Alloys, edited by J. Perkins, The Metallurgical Society of AIME, Plenum Press, New York, 1975, 1–27.
Motohashi, Y., Sakuma, T., Suzuki, M., Hoshiya, T., and Ohsawa, K.: Effect of grain refinement on phase transformation characteristics and mechanical properties of Ti-Ni shape memory alloys, Proc. of ICOMAT-92, pp. 993–998, Monterey Institute for Advanced Studies, 1992.
Wasilewski, R.J.: The effects of applied stress on the martensitic transformation in TiNi, Metall. Trans. 2 (1971), 2973–2981.
Wasilewski, R.J.: The shape memory effect in TiNi — one aspect of stress-assisted martensitic transformation, in Shape Memory Effects in Alloys, edited by J. Perkins, The Metallurgical Society of AIME, Plenum Press, New York, 1975, 245–271.
Adler, P.H., Yu, W., Pelton, A.R., Zadno, R., Duerig, T.W., and Barresi, R.: Scripta Metall. 24 (1990), 943.
Liu, Y., Xie, Z.L., Van Humbeeck, J., and Delaey, L.: Asymmetry of stress-strain curves under tension and compression for NiTi SMAsActa Mater. 46 (1998), 4325–4338.
Mulder, J.H., Thoma, P.E., and Beyer, J.: Anisotropy of the shape memory effect in tension of cold-rolled 50.8Ti49.2Ni (at.%) sheet, Z. Metallkd. 84/7 (1993), 501–508.
Inoue, H., Miwa, N., and Inakazu, N.: Texture and shape memory strain in TiNi alloy sheets, Acta Mater. 44 (1996), 4825–4834.
Zhao, L.: Texture development and anisotropic behaviour in a Ti-45Ni-5Cu (at.%) shape memory alloy, Ph.D. thesis, ISBN 90–9011069–0, University of Twente, Enschede, The Netherlands, 1997.
Melton, K.N.: Ni-Ti based shape memory alloys, in Engineering Aspects of Shape Memory Alloys, edited by T.W. Duerig, K. N. Melton, D. Stöckel and C. M. Wayman, Butterworth-Heinemann, London, 1990,21–35.
Liu, Y.N., Liu, Y., and Van Humbeeck, J.: Lüders-like deformation associated with martensite reorientation in NiTi, Scripta Mater. 38 (1998), 1047–1055.
Zheng, Q.S. and Liu, Y.: Prediction of the detwinning anisotropy in textured NiTi shape memory alloy, Philosophical Magazine A (in press).
Liu, Y., Li, Y.L., Ramesh, K.T., and Van Humbeeck, J.: High rate deformation of martensitic NiTi shape memory alloy, Scripta Mater. 41 (1999), 89–95.
Liu, Y., Li, Y.L., Ramesh, K.T.: Rate dependence of deformation mechanisms in shape memory alloy, Phil. Mag. A, submitted.
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Liu, Y. (2002). On the Detwinning Mechanism in Shape Memory Alloys. In: Sun, Q.P. (eds) IUTAM Symposium on Mechanics of Martensitic Phase Transformation in Solids. Solid Mechanics and Its Applications, vol 101. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0069-6_5
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DOI: https://doi.org/10.1007/978-94-017-0069-6_5
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