Abstract
NiTi (aka Nitinol) shape memory alloys can be alloyed with Nb in order facilitate a wider thermal hysteresis. The ternary alloy thermal hysteresis is nearly 100 °C, which is considerably higher than binary Nitinol. The wider hysteresis for NiTiNb makes the alloy suitable for the civil engineering operating temperature ranges. Thus the alloys are promising for integration into structures and can lead to the development of SMA hybrid composite smart structures. The wider hysteresis is attributed to the presence of second phases within the microstructure. The microstructure consists of a matrix, which undergoes the martensitic transformation and thus gives rise to shape memory behavior. A eutectic-like microstructure constituent is evident, with a substantial volume fraction of nano-precipitates dispersed throughout, and neither takes part in the transformation. Consequences of tailoring the microstructure via thermo-mechanical treatments are explored. In this work, the interaction of the non-transforming microstructural constituents with the martensitic transformation morphology is characterized using a fundamental thermo-mechanical framework. The bulk scale deformation measurement are reported as well as the meso-/micro-structure scale full-field and local deformation analyses. The technique used in this work is in-situ Digital Image Correlation (DIC). With this, the current work assesses the surface strain morphology in order to elucidate the influence of microstructure on the bulk scale shape memory responses.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Choi E, Chung Y-S, Choi J-H, Kim H-T, Lee H (2010) The confining effectiveness of NiTiNb and NiTi SMA wire jackets for concrete. Smart Mater Struct 19(3):035024
Li L, Li Q, Zhang F (2007) Behavior of smart concrete beams with embedded shape memory alloy bundles. J Intell Mater Syst Struct 18(10):1003–1014
Siegert W, Neuking K, Mertmann M, Eggeler GF (2002) Influence of Nb content and processing conditions on microstructure and functional properties of NiTiNb shape-memory alloys. Mater Sci Forum 394–395:361–364
Zhang CS, Zhao LC, Duerig TW, Wayman CM (1990) Effects of deformation on the transformation hysteresis and shape memory effect in a Ni47Ti44Nb9 alloy. Scr Metall Mater 24:1807–1812
Kusagawa M, Nakamura T, Asada Y (2001) Fundamental deformation and recovery behaviors of NiTiNb shape memory alloy. JSME Int J 44(1):57–63
Schryvers D, Shi H, Martinez GT, Van Aert S, Frenzel J, Van Humbeeck J (2013) Nano- and microcrystal investigations of precipitates, interfaces and strain fields in Ni-Ti-Nb by various TEM techniques. Mater Sci Forum 738–739:65–71
Piao M, Miyazaki S, Otsuka K (1992) Characteristics of deformation and transformation in Ti44Ni47Nb9 shape memory alloy. Mater Trans JIM 33(4):346–353
Wang M, Jiang M, Liao G, Guo S, Zhao X (2012) Martensitic transformation involved mechanical behaviors and wide hysteresis of NiTiNb shape memory alloys. Prog Nat Sci Mater Int 22(2):130–138
Zheng Y, Cai W, Luo Y, Zhao L (1997) Effects of heat treatment on tensile properties and shape memory effects of Ni-Ti-Nb alloy. Trans Nonferrous Met Soc China 7(4):92–96
Hamilton RF, Sehitoglu H, Aslantas K, Efstathiou C, Maier HJ (2008) Inter-martensite strain evolution in NiMnGa single crystals. Acta Mater 56(10):2231–2236
Hamilton RF, Dilibal S, Sehitoglu H, Maier HJ (2011) Underlying mechanism of dual hysteresis in NiMnGa single crystals. Mater Sci Eng A 528(3):1877–1881
Daly S, Ravichandran G, Bhattacharya K (2007) Stress-induced martensitic phase transformation in thin sheets of Nitinol. Acta Mater 55(10):3593–3600
Chu TC, Ranson WF, Sutton MA, Peters WH (1985) Applications of digital-image-correlation techniques to experimental mechanics. Exp Mech 25(3):232–244
Sutton MA, Walters WJ, Peters WH, Ranson WF, Mcneil SR (1983) Determination of displacements using an improved digital correlation method. Image Vis Comput 1(3):133–139
Sutton M, Mingqi C, Peters W, Chao Y, McNeill S (1986) Application of an optimized digital correlation method to planar deformation analysis. Image Vis Comput 4(3):143–150
Acknowledgements
This study has been supported by the Mid-Atlantic Universities Transportation Center (MAUTC) Pooled Research Program issued by the Research and Innovative Technology Administration of the US DOT (Grant No. DTRT12-G-UTC03).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2015 The Society for Experimental Mechanics, Inc.
About this paper
Cite this paper
Hamilton, R.F., Lanba, A., Ozbulut, O. (2015). Characterization of Martensitic Transformation Morphology in Wide Hysteresis Shape Memory Alloys. In: Carroll, J., Daly, S. (eds) Fracture, Fatigue, Failure, and Damage Evolution, Volume 5. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-06977-7_19
Download citation
DOI: https://doi.org/10.1007/978-3-319-06977-7_19
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-06976-0
Online ISBN: 978-3-319-06977-7
eBook Packages: EngineeringEngineering (R0)