Applications of Nickel-Titanium Alloy

Sharma, Neeraj; Raj, Tilak; Jangra, Kamal Kumar

doi:10.4103/0976-8580.149472

Cited by 64 publications

(13 citation statements)

References 76 publications

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“…The NiTi shape memory alloy (SMA) is considered as a smart material thanks to its thermomechanical behavior, such as the mechanical shape memory effect (SME) and the thermal effect (TE) [1,2], which make this alloy suitable for aerospace and Micro-Electro-Mechanical Systems industries [3]. In particular, the equiatomic NiTi SMA has been successfully used in various areas, like cardio stents, orthopedic implants and orthodontic devices, because they process, in addition to good corrosion resistance and biocompatibility with the human body, remarkable high strain recovery [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Effect on the Cyclic Behavior of a Superelastic NiTi Archwire

Sarraj

Kessentini

Hassine

et al. 2019

Metals

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In this work, we are interested in examining the strain rate effect on the mechanical behavior of Ni–Ti superelastic wires after hydrogen charging and ageing for 24 h. Specimens underwent 50 cycles of loading-unloading, reaching an imposed deformation of 7.6%. During loading, strain rates from 10−4 s−1 to 10−2 s−1 were achieved. With a strain rate of 10−2 s−1, the specimens were charged by hydrogen for 6 h and aged for one day showed a superelastic behavior marked by an increase in the residual deformation as a function of the number of cycles. In contrast, after a few number of cycles with a strain rate of 10−4 s−1, the Ni-Ti alloy archwire specimens fractured in a brittle manner during the martensite transformation stage. The thermal desorption analysis showed that, for immersed specimens, the desorption peak of hydrogen appeared at 320 °C. However, after annealing the charged specimens by hydrogen at 400 °C for 1 h, an embrittlement took place at the last cycles for the lower strain rates of 10−4 s−1. The present study suggests that the embrittlement can be due to the development of an internal stress in the subsurface of the parent phase during hydrogen charging and due to the creation of cracks and local zones of plasticity after desorption.

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Section: Introductionmentioning

confidence: 99%

Hydrogen Effect on the Cyclic Behavior of a Superelastic NiTi Archwire

Sarraj

Kessentini

Hassine

et al. 2019

Metals

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“…Among the different SMAs, nickel titanium (NiTi) has the best shape memory behavior including high magnitudes of shape recovery, recovery stress, and superelastic strain [ 3 , 7 ]. As a result, NiTi can be found in various fields of application such as actuators [ 8 , 9 , 10 ], aerospace [ 3 , 11 ], biomedical implants and fixtures [ 3 , 5 , 8 , 9 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ], couplings and fasteners [ 10 ], electrical safety devices [ 8 ], micro-electromechanical systems (MEMS) [ 8 , 18 ], naval [ 3 ], smart composites [ 19 ], sporting equipment [ 3 ], surgical instruments [ 3 ], etc.…”

Section: Introductionmentioning

confidence: 99%

A Review of Selective Laser Melted NiTi Shape Memory Alloy

et al. 2018

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NiTi shape memory alloys (SMAs) have the best combination of properties among the different SMAs. However, the limitations of conventional manufacturing processes and the poor manufacturability of NiTi have critically limited its full potential applicability. Thus, additive manufacturing, commonly known as 3D printing, has the potential to be a solution in fabricating complex NiTi smart structures. Recently, a number of studies on Selective Laser Melting (SLM) of NiTi were conducted to explore the various aspects of SLM-produced NiTi. Compared to producing conventional metals through the SLM process, the fabrication of NiTi SMA is much more challenging. Not only do the produced parts require a high density that leads to good mechanical properties, strict composition control is needed as well for the SLM NiTi to possess suitable phase transformation characteristics. Additionally, obtaining a good shape memory effect from the SLM NiTi samples is another challenging task that requires further understanding. This paper presents the results of the effects of energy density and SLM process parameters on the properties of SLM NiTi. Its shape memory properties and potential applications were then reviewed and discussed.

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“…Ni-Ti based shape memory alloys (SMA) are one such difficult-to-machine material with applications in numerous fields (automobile actuators, biomedical, aerospace, micro-electromechancial systems, etc.) [12,13]. These alloys possess the unique properties of pseudo-elasticity, bio-compatibility, corrosion resistance and shape memory effect.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of the Micro-Electrical Discharge Machining of Nickel-Titanium Shape Memory Alloy Using Grey Relations Coupled with Principal Component Analysis

Abidi

Al-Ahmari

Siddiquee

et al. 2017

Metals

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Shape memory alloys (SMAs) are advanced engineering materials which possess shape memory effects and super-elastic properties. Their high strength, high wear-resistance, pseudo plasticity, etc., makes the machining of Ni-Ti based SMAs difficult using traditional techniques. Among all non-conventional processes, micro-electric discharge machining (micro-EDM) is considered one of the leading processes for micro-machining, owing to its high aspect ratio and capability to machine hard-to-cut materials with good surface finish.The selection of the most appropriate input parameter combination to provide the optimum values for various responses is very important in micro-EDM. This article demonstrates the methodology for optimizing multiple quality characteristics (overcut, taper angle and surface roughness) to enhance the quality of micro-holes in Ni-Ti based alloy, using the Grey-Taguchi method. A Taguchi-based grey relational analysis coupled with principal component analysis (Grey-PCA) methodology was implemented to investigate the effect of three important micro-EDM process parameters, namely capacitance, voltage and electrode material.The analysis of the individual responses established the importance of multi-response optimization. The main effects plots for the micro-EDM parameters and Analysis of Variance (ANOVA) indicate that every parameter does not produce same effect on individual responses, and also that the percent contribution of each parameter to individual response is highly varied. As a result, multi-response optimization was implemented using Grey-PCA. Further, this study revealed that the electrode material had the strongest effect on the multi-response parameter, followed by the voltage and capacitance. The main effects plot for the Grey-PCA shows that the micro-EDM parameters "capacitance" at level-2 (i.e., 475 pF), "discharge voltage" at level-1 (i.e., 80 V) and the "electrode material" Cu provided the best multi-response.

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Applications of Nickel-Titanium Alloy

Cited by 64 publications

References 76 publications

Hydrogen Effect on the Cyclic Behavior of a Superelastic NiTi Archwire

Hydrogen Effect on the Cyclic Behavior of a Superelastic NiTi Archwire

A Review of Selective Laser Melted NiTi Shape Memory Alloy

An Investigation of the Micro-Electrical Discharge Machining of Nickel-Titanium Shape Memory Alloy Using Grey Relations Coupled with Principal Component Analysis

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