Review on phase transformation behavior of NiTi shape memory alloys

Velmurugan, C.; Senthilkumar, V.; Dinesh, S.; Arulkirubakaran, D.

doi:10.1016/j.matpr.2018.03.051

Cited by 47 publications

(17 citation statements)

References 39 publications

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“…Additive technologies [232], drawing [233] or cold rolling [234], high-pressure torsion (HPT) [235], and equal channel angular pressing (ECAP) [236] can also be used for the manufacturing of tools using nitinol alloy. The favourable fineness of the austenitic matrix grain [237,238] depends on the heat treatment conditions [239,240] and the given technological processes, deciding the course of the Ni 4 Ti 3 [241,242] dispersion precipitation processes in austenite and martensitic transformation, respectively, in the B19 or R structure phases [242,243].…”

Section: Methods and Tools Of Root Canal Preparation In Endodontic Treatmentmentioning

confidence: 99%

Is Gutta-Percha Still the “Gold Standard” among Filling Materials in Endodontic Treatment?

Dobrzańska¹,

Dobrzański²,

Dobrzański³

et al. 2021

Processes

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The paper is an extensive monographic review of the literature, and also uses the results of the authors’ own experimental research illustrating the noticed developmental tendencies of the filling material based on gutta-percha. The whole body of literature proves the correctness of the research thesis that this material is the best currently that can be used in endodontics. Caries is one of the most common global infectious diseases. Since the dawn of humankind, the consequence of the disease has been the loss of dentition over time through dental extractions. Both tooth caries and tooth loss cause numerous complications and systemic diseases, which have a serious impact on insurance systems and on the well-being, quality, and length of human life. Endodontic treatment, which has been developing since 1836, is an alternative to tooth extraction. Based on an extensive literature review, the methodology of qualifying patients for endodontic treatment was analyzed. The importance of selecting filling material and techniques for the development and obturation of the root canal during endodontic treatment was described. Particular attention was paid to the materials science aspects and the sequence of phase transformations and precipitation processes, as well as the need to ensure the stoichiometric chemical composition of Ni–Ti alloys, and the vacuum metallurgical processes and material processing technologies for the effects of shape memory and superelasticity, which determine the suitability of tools made of this alloy for endodontic purposes. The phenomena accompanying the sterilization of such tools, limiting the relatively small number of times of their use, play an important role. The methods of root canal preparation and obturation methods through cold side condensation and thermoplastic methods, including the most modern of them, the thermo-hydraulic condensation (THC) technique, were analyzed. An important element of the research hypothesis was to prove the assumption that to optimize the technology of development and obturation of root canals, tests of filling effectiveness are identified by the density and size of the gaps between the root canal wall, and the filling methods used and devices appropriate for material research, using mainly microscopy such as light stereoscopic (LSM) and scanning electron (SEM). The most beneficial preparations were obtained by making a longitudinal breakthrough of 48 natural human teeth, extracted for medical reasons, different from caries, with compliance with all ethical principles in this field. The teeth were prepared using various methods and filled with multiple obturation techniques, using a virtual selection of experimental variants. The breakthroughs were made in liquid nitrogen after a one-sided incision with a narrow gap created by a diamond disc using a materialographic cutter. The best effectiveness of the root canal filling was ensured by the technology of preparing the root canals with K3 rotary nitinol tools and filling the teeth with the THC thermoplastic method using the System B and Obtura III devices with studs and pellets of filling material based on gutta-percha after covering the root canal walls with a thin layer of AH Plus sealant. In this way, the research thesis was confirmed.

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Section: Methods and Tools Of Root Canal Preparation In Endodontic Treatmentmentioning

confidence: 99%

Is Gutta-Percha Still the “Gold Standard” among Filling Materials in Endodontic Treatment?

Dobrzańska¹,

Dobrzański²,

Dobrzański³

et al. 2021

Processes

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“…In all cases, a very high martensite-austenite transformation temperature was observed, guaranteeing the martensitic phase at ambient temperature, and the transformation temperatures did not vary for samples with different heat treatments. In each case, the existence of two peaks, both in heating and cooling directions, was considered to be as result of the existing secondary phase, as observed in some cases for Nitinol [17].…”

Section: Transformation Temperaturesmentioning

confidence: 99%

Experimental and Numerical Characterization of High Damping Martensitic CuAlMn Sheets

et al. 2020

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This paper deals with the experimental and numerical characterization of a high damping CuAlMn sheet with a martensitic micro-structure at ambient temperature. A Cu-Al-Mn shape memory alloy containing 11.65 wt.% of Al and 3 wt.% of Mn, was cast and hot rolled to the thickness of 0.4–0.3 mm. Transformation temperatures, micro-structure and mechanical properties were studied. Effects of the heat treatment on damping were investigated, identifying the proper heat treatment to obtain a higher damping. Having to model the amplitude dependent damping of the material investigated, a material model was developed based of cyclic behavior under traction-compression load. The model was validated with experiments on the non-linear damping of the material.

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“…The underlying mechanism of these properties is a reversible phase transformation between a hightemperature austenitic phase and a low-temperature martensitic phase when an external stimulus of stress or temperature is applied [3]. Thus, SMAs show great potential for application as actuators and sensors in industrial [4,5], automotive [2,6], aerospace [3,7], micro-electromechanical system (MEMS) [8] and biomedical [9] fields. For the majority of actuators and sensors, fast response and large output strain/stress are imperative and desirable properties.…”

Section: Introductionmentioning

confidence: 99%

External-Field-Induced Phase Transformation and Associated Properties in a Ni50Mn34Fe3In13 Metamagnetic Shape Memory Wire

Chen

Cong

et al. 2021

Metals

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Metamagnetic shape memory alloys exhibit a series of intriguing multifunctional properties and have great potential for applications in magnetic actuation, sensing and magnetic refrigeration. However, the poor mechanical properties of these alloys with hardly any tensile deformability seriously limit their practical application. In the present work, we developed a Ni-Fe-Mn-In microwire that exhibits both a giant, tensile superelasticity and a magnetic-field-induced first-order phase transformation. The recoverable strain of superelasticity is more than 20% in the temperature range of 233–283 K, which is the highest recoverable strain reported heretofore in Ni-Mn-based shape memory alloys (SMAs). Moreover, the present microwire exhibits a large shape memory effect with a recoverable strain of up to 13.9% under the constant tensile stress of 225 MPa. As a result of the magnetic-field-induced first-order phase transformation, a large reversible magnetocaloric effect with an isothermal entropy change ΔSm of 15.1 J kg−1 K−1 for a field change from 0.2 T to 5 T was achieved in this microwire. The realization of both magnetic-field and tensile-stress-induced transformations confers on this microwire great potential for application in miniature multi-functional devices and provides an opportunity for multi-functional property optimization under coupled multiple fields.

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Review on phase transformation behavior of NiTi shape memory alloys

Cited by 47 publications

References 39 publications

Is Gutta-Percha Still the “Gold Standard” among Filling Materials in Endodontic Treatment?

Is Gutta-Percha Still the “Gold Standard” among Filling Materials in Endodontic Treatment?

Experimental and Numerical Characterization of High Damping Martensitic CuAlMn Sheets

External-Field-Induced Phase Transformation and Associated Properties in a Ni50Mn34Fe3In13 Metamagnetic Shape Memory Wire

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