Temperature memory effect of a nickel–titanium shape memory alloy

Zheng, Yubin; Cui, Lishan; Schrooten, Jan

doi:10.1063/1.1637958

Cited by 84 publications

(53 citation statements)

References 14 publications

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“…[11][12][13][14][15][16][17][18][19] Binary 50-50 at. pct NiTi alloys can have transformation temperatures just below 0°C and a superelastic range between freezing and 250°C, making them excellent candidates for consumer electronics.…”

Section: Health Concerns Over Pb Toxicity In Traditionalmentioning

confidence: 99%

Interfacial Reactions in Model NiTi Shape Memory Alloy Fiber-Reinforced Sn Matrix “Smart” Composites

Coughlin

Williams

Crawford

et al. 2008

Metall Mater Trans A

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In this article, the microstructure properties of a novel Pb-free solder composite were examined. A binary nickel-titanium shape memory alloy (SMA) fiber was used to reinforce the Sn-rich matrix, to take advantage of the superelastic properties of the fiber. The objective of this study was to understand long-term, high-temperature interfacial growth in a model NiTi fiber-reinforced Sn matrix composite solder system. The microstructure was quantified by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and wavelength dispersive spectroscopy (WDS). The mechanical properties of the interfacial zone, e.g., Young's modulus and hardness, were characterized by nanoindentation. The evolution of the reaction products with time and the relationship between composition and local mechanical properties are discussed.

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Section: Health Concerns Over Pb Toxicity In Traditionalmentioning

confidence: 99%

Interfacial Reactions in Model NiTi Shape Memory Alloy Fiber-Reinforced Sn Matrix “Smart” Composites

Coughlin

Williams

Crawford

et al. 2008

Metall Mater Trans A

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“…Apart from the fundamental relevance towards a better understanding, the effect may find also important practical applications [6,10].…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7]). Unlike the shape memory effect, the thermal memory effect (TME) in SMA is less understood, proposed scenarios including the redistribution of accumulated stress [2][3][4], or geometrical constrictions effects [8].…”

Section: Introductionmentioning

confidence: 99%

Thermal memory fading by heating to a lower temperature: Experimental data on polycrystalline NiFeGa ribbons and 2D statistical model predictions

Ţolea

Văleanu

2017

Solid State Communications

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Shape memory alloys are known to memorise one -or several-temperatures at which the martensite-austenite transformation was stopped before completion in the past, the memory manifesting as specific dips in subsequent calorimetric scans. Previous studies have shown that this memory can be erased by heating to higher temperatures than the ones previously recorded. In this paper, we study a distinct memory fading effect which takes place by heating to a lower temperature. This effect is reported in NiFeGa as polycrystalline ribbons, the alloy being initially studied as bulk for which the thermal memory effect was not found. If, after an initial incomplete heating up to T1 one performs a second incomplete heating up to T2 < T1, a new calorimetric dip appears at T2, as expected, while less expected was that the dip corresponding to T1 reduces in amplitude or even vanishes (if the arrest at T2 is repeated). The memory fading effect is more clear for small differences T1 − T2 and less obvious or absent for large ones. The second part of the paper employs a statistical 2D model, which associates the memorized temperatures with a depletion of certain martensite plates sizes, and also supports the memory fading effect.

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“…Recently, however, these materials appear promising for civil engineering applications due to the high damping capacity [10][11][12][13][14], coupling with good strength, ductility and very good corrosion resistance. Furthermore, there are many factors, which influence the transformation characteristics in NiTi-based SMAs: the change in nickel content, ageing after solution treatment, thermo-mechanical treatment, thermal cycling, addition of ternary alloying elements and processing techniques [15][16][17][18]. Heating rate is another concern in testing SMAs.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrostatic Pressure on Thermodynamic Properties of NiTi Shape Memory Alloy

Tatar¹,

Yildirim²,

Kayğili³

2017

Archives of Metallurgy and Materials

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The effect of hydrostatic pressure and different heating/cooling rates on physical properties and microstructure of NiTi shape memory alloy has been investigated. The transformation temperatures and physical properties of the alloy have changed with applied pressure. It has been clearly seen from Differential Scanning Calorimetry (DSC) that with the increase of applied pressure, while A s and A f , and M f transformation temperatures decrease, M s value increase. Moreover, based on the increase of the pressure amount applied on the sample, there was an average increase of 48% for Gibbs free energy and 18% for elastic strain energy. Entropy of the alloys decreases depending on the increase in the amount of applied pressure for all heating rates. Depending on the amount of applied pressure on the sample, an interior strain of 0.177% at most was observed. With the increase of applied pressure on the sample, it was determined that activation energy increased. Additionally, the Scanning Electron Microscopy (SEM) images of the samples show that the grain sizes of the unpressured sample and the samples on which pressure is applied are between 40 and 120 μm, which was determined by Image Analysis Method.

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Temperature memory effect of a nickel–titanium shape memory alloy

Cited by 84 publications

References 14 publications

Interfacial Reactions in Model NiTi Shape Memory Alloy Fiber-Reinforced Sn Matrix “Smart” Composites

Interfacial Reactions in Model NiTi Shape Memory Alloy Fiber-Reinforced Sn Matrix “Smart” Composites

Thermal memory fading by heating to a lower temperature: Experimental data on polycrystalline NiFeGa ribbons and 2D statistical model predictions

Effect of Hydrostatic Pressure on Thermodynamic Properties of NiTi Shape Memory Alloy

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