Electrochemical characterization of Ni47.7Ti37.8Nb14.5 shape memory alloy in artificial saliva

Mareci, Daniel; Chelariu, R.; Cailean, A.; Sutiman, Daniel

doi:10.1002/maco.201106337

Cited by 11 publications

(5 citation statements)

References 37 publications

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“…Shape memory alloys have a functionality that effectively represents a sensor and an actuator, which makes them a multifunctional material with many different applications . Among the shape memory alloys, NiTi shape memory alloys are being utilized with the most desirable amount of feedback in a number of applications , including biomedical and industrial applications . Nevertheless, the low transformation temperatures (−100 to 100 °C) and excessive production cost of NiTi alloys render their usage for many applications impractical, particularly for high‐temperature usage.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and corrosion behaviour of Cu-Al-Ni shape memory alloys with Ag nanoparticles

Saud

Hamzah

Abubakar

et al. 2014

Materials and Corrosion

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In this study, the effect of silver nanoparticles on the transformation temperatures, microstructural and corrosion characteristics of the ternary Cu-Al-Ni shape memory alloys (SMA) was investigated. It was subsequently observed that the addition of Ag nanoparticles controlled the phase morphology and orientations of the parent phases, along with the formation of the Ag-rich precipitates. Furthermore, it was shown that the addition of Ag nanoparticles can affect the martensitic transformation temperature, due to the microstructure changes that are associated with the formation of intermetallic compounds and/or precipitates. The corrosion behaviour of the Cu-Al-Ni shape memory alloy with and without nano-Ag addition were investigated using electrochemical tests in a NaCl solution, and their results showed that the corrosion potential of Cu-Al-Ni-Ag (nanoparticles) SMA (À277.1 mV SCE ) was nobler than the Cu-Al-Ni SMA. It was also shown that there is a decline in corrosion current density from 6.93 to 5.61 µA/cm 2 after the addition of nano-Ag to Cu-Al-Ni SMA. The combination of SEM, together with EDX and XRD, also showed that the formation of the corrosion products silver chloride, cuprous oxide, aluminium oxide/hydroxide and silver oxide act as a protective layer and improve the corrosion resistance of Cu-Al-Ni-Ag SMA.

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Section: Introductionmentioning

confidence: 99%

Microstructure and corrosion behaviour of Cu-Al-Ni shape memory alloys with Ag nanoparticles

Saud

Hamzah

Abubakar

et al. 2014

Materials and Corrosion

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“…However, the Nb content has no significant influence on thermal-induced transformation hysteresis of NiTiNb shape memory alloys. The thermal-induced transformation hysteresis of Ni 49 Ti 49 Nb 2 , Ni 48 Ti 48 Nb 4 , and Ni 47 Ti 47 Nb 6 shape memory alloys was determined as 16.3, 10.6, and 12.3 • C [12], respectively, which is similar to that of NiTi (10 • C) [15]. Furthermore, for the NiTiNb SMAs, the different Nb content leads to significant changes in microstructure [10] and phase transformation [12].…”

Section: Introductionmentioning

confidence: 67%

Thermal-Induced Phase Transformation Behavior of NiTiNb Hypoeutectic, Eutectic, and Hypereutectic Alloys

Yin

Fan

et al. 2019

Metals

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In the present work, three NiTiNb alloys with nominal compositions of Ni50–x/2Ti50–x/2Nbx (x = 18, 20 and 22, at.%) were prepared. The microstructure, thermal-induced phase transformation, and phase components of NiTiNb hypoeutectic, eutectic, and hypereutectic alloys were investigated by scanning electron microscopy coupled with energy dispersive spectrometer (SEM/EDS), differential scanning calorimetry (DSC), and X-ray diffraction (XRD), respectively. Two peaks occurred in the DSC curves of Ni41Ti41Nb18 solution at 750 and 850 °C. The different microstructures of NiTiNb hypoeutectic, eutectic and hypereutectic alloys, the occurrence of two peaks in the DSC curves, and the characteristic of martensite transformation temperature were analyzed and discussed. The results show that different Nb content leads to different microstructures of Ni50–x/2Ti50–x/2-Nbx alloys. Moreover, the difference of Ni/Ti ratio between the primary NiTi matrix and NiTi in eutectic structure strongly influenced the phase transformation behavior that the DSC curves of Ni41Ti41Nb18 alloy show two peaks. Furthermore, under the same solution treatment, the Ni40Ti40Nb20 alloy has a lower Ms than the other two alloys. The Ms has a tendency to decrease with an increase in solution temperature.

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“…Therefore, to improve NiTi alloy, the Ni concentration can be reduced by replacing it with a third and fourth element, such as Ta, Nb, V, Sn. Mareci et al reported that the substituting of Ni with Nb in NiTiNb alloy increased the resistance of NiTi shape memory alloy to localized corrosion [22]. In another study, Balci et al found that the dendritic microstructure of the shape memory alloys prepared in different proportions were different in terms of composition, e.g., although Ti element has a higher ratio, from the EDX analysis and SEM images showed that the dendritic structure observed of in the Ni27Ti50Nb21V2 (at.%) alloy almost consist of Nb [23].…”

Section: Introductionmentioning

confidence: 99%

Investigate of Microhardness and Microstructure of Ti-Ni-Nb-X (Ta and V) Shape Memory Alloys

Balci

Dağdelen

2021

International Journal of Innovative Engineering Applications

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Conference paperIn this study, based on designed Ti-50Ni, Ti-27Ni-23Nb, and Ti-27Ni-19Nb-4X (Ta and V) SMAs were prepared using arc melting. The microhardness and microstructure of the prepared alloys were examined. The optical microscope (OM) and Scanning Electron Microscopy (SEM) images can be noted that Nb, Ta, and V addition in substitution to nickel causes a change in the microstructure morphology of TiNi Shape Memory Alloy at room temperature. The microhardness results shown that when V and Ta elements were added to SMAs, the microhardness of the alloys was significantly increased. Microhardness measurements were determined by taking the alloys from random positions. The microhardness value of equal atomic Ti-Ni SMA was found to 243 HV0.3. This value was determined to 354 HV0.3 in the Ti-27Ni-23Nb ternary SMA. By the addition of Ta into the Ti-Ni-Nb alloy, the microhardness value was enhanced to approximately 380 HV0.3, additionally, moreover, by adding Vanadium element to the ternary alloy, the microhardness was increased to about 500 HV0.3.

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Electrochemical characterization of Ni_47.7Ti_37.8Nb_14.5 shape memory alloy in artificial saliva

Cited by 11 publications

References 37 publications

Microstructure and corrosion behaviour of Cu-Al-Ni shape memory alloys with Ag nanoparticles

Microstructure and corrosion behaviour of Cu-Al-Ni shape memory alloys with Ag nanoparticles

Thermal-Induced Phase Transformation Behavior of NiTiNb Hypoeutectic, Eutectic, and Hypereutectic Alloys

Investigate of Microhardness and Microstructure of Ti-Ni-Nb-X (Ta and V) Shape Memory Alloys

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