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Effect of thermal cycling on the thermomechanical behaviour of NiTi shape memory alloys

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Title: Effect of thermal cycling on the thermomechanical behaviour of NiTi shape memory alloys
Authors: Urbina, C. cristina.urbina@urv.cat, De la Flor, S.1, Ferrando, F.1
Source: Materials Science & Engineering: A. Feb2009, Vol. 501 Issue 1/2, p197-206. 10p.
Subjects: Shape memory alloys, Nickel-titanium alloys, Thermomechanical properties of metals, Phase transitions, Phase diagrams, Materials science
Abstract: Abstract: This paper analyses the influence of thermal cycling at zero stress on the thermomechanical response of NiTi shape memory alloy (SMA) wire in the martensitic, R-phase and austenitic transformation ranges. An in depth study compares the mechanical properties of a sample thermally cycled at zero stress and a sample without thermal or mechanical cycling. The critical stress–temperature diagram for each sample is presented taking into account the R-phase transformation zone. The results show that thermal cycling has considerable impact on the transformation behaviour of the alloy and on the mechanical properties of the R-phase: the values of the apparent modulus and the critical transformation stresses are higher. The parameters that describe the SMA macromechanical behaviour, then, undergo a considerable change due to thermal cycling, suggesting that if an SMA has to be used throughout the R-phase range, the material should be thermally cycled to obtain better mechanical properties. [Copyright &y& Elsevier]
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Database: Engineering Source
Description
Abstract:Abstract: This paper analyses the influence of thermal cycling at zero stress on the thermomechanical response of NiTi shape memory alloy (SMA) wire in the martensitic, R-phase and austenitic transformation ranges. An in depth study compares the mechanical properties of a sample thermally cycled at zero stress and a sample without thermal or mechanical cycling. The critical stress–temperature diagram for each sample is presented taking into account the R-phase transformation zone. The results show that thermal cycling has considerable impact on the transformation behaviour of the alloy and on the mechanical properties of the R-phase: the values of the apparent modulus and the critical transformation stresses are higher. The parameters that describe the SMA macromechanical behaviour, then, undergo a considerable change due to thermal cycling, suggesting that if an SMA has to be used throughout the R-phase range, the material should be thermally cycled to obtain better mechanical properties. [Copyright &y& Elsevier]
ISSN:09215093
DOI:10.1016/j.msea.2008.10.026