Effect of short-time direct current heating on phase transformation and superelasticity of Ti–50.8at.%Ni alloy

Wang, Y.B.; Zheng, Yufeng; Liu, Yinong

doi:10.1016/j.jallcom.2008.10.131

Cited by 17 publications

(15 citation statements)

References 11 publications

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“…; Wanga et al . ). Some investigators used this method to evaluate its antibacterial effects on the electrically activated vertebral implants (Secinti et al .…”

Section: Introductionmentioning

confidence: 97%

“…These results indicate that direct current heating is able to impose changes in microstructure of titanium alloys where it can either improve or deteriorate its super elasticity (Wanga et al . ). Furthermore, some publications have discussed the fact that overheating can make significant microstructural changes and alter the transformation behavior and functional properties of these alloys (Tan and Liu ).…”

Section: Introductionmentioning

confidence: 97%

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The effect of electrical treatment on cyclic fatigue of NiTi instruments

Saghiri

Asatourian²,

Garcı́a-Godoy

et al. 2014

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Summary Dentists desire to use NiTi rotary instruments, which do not break inside the root canals of teeth, since the pieces from broken files are difficult to remove. The NiTi rotary instrument breakage is because of cyclic and torsional fatigue. Here the low-voltage (12 V) and high voltage (24 V) electrical treatments were used to enhance the cyclic fatigue of NiTi rotary instruments and increase their durability. In excremental groups, following electrical treatment samples of the NiTi instruments were rotated inside artificial root canals until they broke. Our results showed that electrical treatment with 12-V DC was effective in restoring NiTi instrument’s resistance to cyclic fatigue. The scanning electron microscopy images and fractograph of samples exposed to 12-V electrical treatment showed a more regular texture over the surface with less dimpling on fractured site. These patterns can improve the super elasticity of tested devices during rotational movement, and delay the NiTi instruments separation in root canal preparations.

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“…; Wanga et al . ). Some investigators used this method to evaluate its antibacterial effects on the electrically activated vertebral implants (Secinti et al .…”

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

The effect of electrical treatment on cyclic fatigue of NiTi instruments

Saghiri

Asatourian²,

Garcı́a-Godoy

et al. 2014

Scanning

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“…While this is not the first time electrical resistance heating of Nitinol has been proposed, and in fact commercial devices are available for shape setting orthodontic archwires [24], it is the first time that a practical, step-by-step method for electrical shape setting has been described for wires and tubes in the sizes and shapes commonly used in robotics. Smith and Hodgsen noted that electrical resistance annealing is one of many possible shape setting methods but did not provide details other than to note that care must be taken to avoid overheating [22].…”

Section: Introductionmentioning

confidence: 99%

“…Malard et al presented results of high power electrical heat treatment of Nitinol wires but did not address re-shaping superelastic Nitinol, which is required in concentric tube robots and useful in prototyping other medical devices [25]. Using a commercially available electrical shape setting system for orthodontic archwires, Wang et al showed that Joule heating for short times did not substantially alter the material properties, but longer heating times over 20 s did change the superelastic properties of the wires [24]. …”

Section: Introductionmentioning

confidence: 99%

Rapid, Reliable Shape Setting of Superelastic Nitinol for Prototyping Robots

Gilbert

Webster

2016

IEEE Robot. Autom. Lett.

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Shape setting Nitinol tubes and wires in a typical laboratory setting for use in superelastic robots is challenging. Obtaining samples that remain superelastic and exhibit desired precurvatures currently requires many iterations, which is time consuming and consumes a substantial amount of Nitinol. To provide a more accurate and reliable method of shape setting, in this paper we propose an electrical technique that uses Joule heating to attain the necessary shape setting temperatures. The resulting high power heating prevents unintended aging of the material and yields consistent and accurate results for the rapid creation of prototypes. We present a complete algorithm and system together with an experimental analysis of temperature regulation. We experimentally validate the approach on Nitinol tubes that are shape set into planar curves. We also demonstrate the feasibility of creating general space curves by shape setting a helical tube. The system demonstrates a mean absolute temperature error of 10°C.

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“…Only a few studies have been carried out on the TiNi shape memory alloys. [7][8][9][10] Ti-Ni based alloys are the most important practical shape memory alloys (SMAs) due to their excellent properties. 11 However, for shape memory applications, transformation temperature control is often very stringent.…”

Section: Introductionmentioning

confidence: 99%

Effects of electropulsing treatment on mechanical properties in Ti rich TiNi shape memory alloy

Cao

Zhang

Shek

2013

Materials Science and Technology

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The influence of electropulsing treatment on thermomechanical behaviour in terms of transformation temperatures and mechanical properties of a cold worked Ti rich TiNi shape memory alloy was studied. The results showed that the transformation temperatures increase with increasing current intensity. The superelasticity of the alloy is improved after the electropulsing treatment, and the hardness of the alloy decreased with increasing current intensity. The microstructure of the alloy showed that the above changes can be attributed to the decreasing dislocation density due to the current pulses.

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Effect of short-time direct current heating on phase transformation and superelasticity of Ti–50.8at.%Ni alloy

Cited by 17 publications

References 11 publications

The effect of electrical treatment on cyclic fatigue of NiTi instruments

The effect of electrical treatment on cyclic fatigue of NiTi instruments

Rapid, Reliable Shape Setting of Superelastic Nitinol for Prototyping Robots

Effects of electropulsing treatment on mechanical properties in Ti rich TiNi shape memory alloy

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