Effects of Pseudoelastic Cycling under Different Temperatures on Physical and Mechanical Properties of a NiTi Alloy

Abstract:

Article Preview

The effects of pseudoelastic cycling under different temperatures on physical and mechanical properties of a NiTi superelastic wire were investigated by uniaxial tensile testing. The samples were cyclically deformed up to 6% strain under several test temperatures above the austenite finish temperature (Af). In order to approach a cyclic saturation level, number of cycles was established as 20. The temperature at which mechanical cycling was performed played a strong role on residual strain, dissipated energy and also on the critical stress to induce martensite, being consistent with the Clausius-Clapeyron relationship. It was found that an increase in test temperature resulted in more significant changes in the alloy’s functional behavior, but cyclic stability tended to be reached within fewer cycles. X-ray diffraction results showed that no martensite was stabilized at any condition and that austenite diffraction peaks intensities increased with test temperature, which was attributed to stress relaxation. Tensile tests until rupture and three point bending tests revealed that the mechanical response of the specimens cycled at higher temperatures and as received were fairly similar, and that specimens cycled at lower temperatures exhibited a slightly higher flexibility.

Info:

Periodical:

Edited by:

Pietro Vincenzini

Pages:

134-140

Citation:

M. C. Mendes Rodrigues et al., "Effects of Pseudoelastic Cycling under Different Temperatures on Physical and Mechanical Properties of a NiTi Alloy", Advances in Science and Technology, Vol. 97, pp. 134-140, 2017

Online since:

October 2016

Export:

Price:

$41.00

* - Corresponding Author

[1] K. Otsuka, C. M. Wayman, Shape memory materials, Cambridge, New York, (1998).

[2] S. Gupta, A. R. Pelton, J. D. Weaver, High compressive pre-strains reduce the bending fatigue life of nitinol wire, J. Mech. Behav. Biomed. Mater. 44 (2015) 96-108.

DOI: https://doi.org/10.1016/j.jmbbm.2014.12.007

[3] D. Vojtech, A. Michalcová, J. Capek, I. Marek, L. Dragounová, Structural and mechanical stability of the nano-crystalline Ni-Ti (50. 9 at. % Ni) shape memory alloy during short-term heat treatments, Intermetallics. 49 (2014) 7-13.

DOI: https://doi.org/10.1016/j.intermet.2013.12.013

[4] W. Tang, R. Sandström, Analysis of the influence of cycling on TiNi shape memory alloys properties, Mater. Design. 14 (1993) 103-113.

[5] S. Myiazaki, T. Imai, Y. Igo, K. Otsuka, Effect of cyclic deformation on the pseudoelasticity characteristics of Ti-Ni alloys, Metall. Trans. A17 (1986) 115-120.

DOI: https://doi.org/10.1007/bf02644447

[6] K. C. Atli, B. E. Franco, I. Karaman, D. Gaydosh, R. D. Noebe, Influence of crystallographic compatibility on residual strain of TiNi based shape memory alloys during thermo-mechanical cycling, Mater. Sci. Eng. A574 (2013) 9-16.

DOI: https://doi.org/10.1016/j.msea.2013.02.035

[7] C. Maletta, E. Sgambitterra, F. Furgiuele, R. Casati, A. Tuissi. Fatigue properties of a pseudoelastic NiTi alloy: Strain ratcheting and hysteresis under cyclic tensile loading, Int. J. Fatigue. 66 (2014) 78-85.

DOI: https://doi.org/10.1016/j.ijfatigue.2014.03.011

[8] Q. Kan, C. Yu, G. Kang, J. Li, W. Yan, Experimental observations on rate-dependent cyclic deformation of super-elastic NiTi shape memory alloy, Mech. Mater. 97 (2016) 48-58.

DOI: https://doi.org/10.1016/j.mechmat.2016.02.011

[9] J. Olbricht, A. Yawny, A. M. Condó, F. C. Lovey, G. Eggeler, The influence of temperature on the evolution of functional properties during pseudoelastic cycling of ultra fine grained NiTi, Mater. Sci. Eng. A481-482 (2008) 142-145.

DOI: https://doi.org/10.1016/j.msea.2007.01.182

[10] H. Tobushi, K. Tanaka, T. Hori, T. Sawada, T. Hattori, Pseudoelasticity of TiNi shape memory alloy, JSME Int. J. 36 (1993) 314-318.

DOI: https://doi.org/10.1299/jsmea1993.36.3_314

[11] E. Pieczyska, S. Gadaj, W. K. Nowacki, K. Hoshio, Y. Makino, H. Tobushi, Characteristics of energy storage and dissipation in TiNi shape memory alloy, Sci. Technol. Adv. Mater. 6 (2005) 889-894.

DOI: https://doi.org/10.1016/j.stam.2005.07.008

[12] ASTM International, F 2516-07; Standard Test Method for Tension Testing of Nickel-Titanium Superelastic Materials, West Conshohocken, 2008, 6p.

[13] L. C. Brinson, I. Shmidt, R. Lammering, Stress-induced transformation behavior of a polycrystalline NiTi shape memory alloy: micro and macromechanical investigations via in situ optical microscopy, J. Mech. Phys. Solids. 52 (2004) 1549-1571.

DOI: https://doi.org/10.1016/s0022-5096(04)00007-9

[14] S. Padula II, S. Qiu, D. Gaydosh, R. Noebe, G. Bigelow, A. Garg, R. Vaidyanathan, Effect of upper-cycle temperature on the load-biased, strain-temperature response of NiTi, Metall. Mater. Trans. A. 43 (2012) 4610-4621.

DOI: https://doi.org/10.1007/s11661-012-1267-5