Bibliografías temáticas / Nickel-titanium

Literatura académica sobre el tema "Nickel-titanium"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 29 de mayo de 2022

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Artículos de revistas sobre el tema "Nickel-titanium"

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Chidambaram, S., M. Vijay, D. Praveen Kumar Varma, K. Baburam Reddy, D. Ravindranath y M. Rajendra Prasad. "Comparison of Galvanic Corrosion Potential of Metal Injection Molded Brackets to that of Conventional Metal Brackets with Nickel-Titanium and Copper Nickel-Titanium Archwire Combinations". Journal of Contemporary Dental Practice 14, n.º 3 (2013): 488–95. http://dx.doi.org/10.5005/jp-journals-10024-1350.

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ABSTRACT Aim The aim of the study is to investigate the galvanic corrosion potential of metal injection molding (MIM) brackets to that of conventional brackets under similar in vitro conditions with nickel-titanium and copper nickel-titanium archwires. Materials and methods Twenty-five maxillary premolar MIM stainless steel brackets and 25 conventional stainless steel brackets and archwires, 0.16 inch, each 10 mm length, 25 nickeltitanium wires, 25 copper nickel-titanium wires were used. They were divided into four groups which had five samples each. Combination of MIM bracket with copper nickel-titanium wire, MIM bracket with nickel-titanium wire and conventional stainless steel brackets with copper nickel-titanium wire and conventional stainless steel brackets with nickel-titanium wires which later were suspended in 350 ml of 1 M lactic acid solution media. Galvanic corrosion potential of four groups were analyzed under similar in vitro conditions. Precorrosion and postcorrosion elemental composition of MIM and conventional stainless steel bracket by scanning electron microscope (SEM) with energy dispersive spectroscope (EDS) was done. Results MIM bracket showed decreased corrosion susceptibility than conventional bracket with copper nickeltitanium wire. Both MIM and conventional bracket showed similar corrosion resistance potential in association with nickel-titanium archwires. It seems that both brackets are more compatible with copper nickel-titanium archwires regarding the decrease in the consequences of galvanic reaction. The EDS analysis showed that the MIM brackets with copper nickel-titanium wires released less metal ions than conventional bracket with copper nickeltitanium wires. Conclusion MIM brackets showed decreased corrosion susceptibility, copper nickel-titanium archwires are compatible with both the brackets than nickel-titanium archwires. Clinical significance Clinically MIM and conventional brackets behaved more or less similarly in terms of corrosion resistance. In order to decrease the corrosion potential of MIM brackets, more precise manufacturing technique should be improved to get a more smoother surface finish. How to cite this article Varma DPK, Chidambaram S, Reddy KB, Vijay M, Ravindranath D, Prasad MR. Comparison of Galvanic Corrosion Potential of Metal Injection Molded Brackets to that of Conventional Metal Brackets with Nickel-Titanium and Copper Nickel-Titanium Archwire Combinations. J Contemp Dent Pract 2013;14(3):488-495.
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Rao, J., T. Roberts, K. Lawson y J. Nicholls. "Nickel titanium and nickel titanium hafnium shape memory alloy thin films". Surface and Coatings Technology 204, n.º 15 (abril de 2010): 2331–36. http://dx.doi.org/10.1016/j.surfcoat.2009.12.025.

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Ye, H. Q. "Structure of mechanically alloyed nickel and titanium-nickel/titanium carbide composites". Metal Powder Report 51, n.º 1 (enero de 1997): 36. http://dx.doi.org/10.1016/s0026-0657(97)80104-x.

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Ovcharenko, V. V., A. N. Monogenov, Yu F. Yasenchuk y V. É. Gyunter. "The structure of porous nickel titanium reinforced by monolithic nickel titanium". Technical Physics Letters 32, n.º 4 (abril de 2006): 288–91. http://dx.doi.org/10.1134/s1063785006040043.

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Sharma, Madhur, Kalpit Shaha, Hemant Sharma y Amit Maheshwari. "Titanium dioxide coating on nickel-titanium archwire". American Journal of Orthodontics and Dentofacial Orthopedics 159, n.º 5 (mayo de 2021): 560–61. http://dx.doi.org/10.1016/j.ajodo.2021.01.015.

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Stokes, Orsure W. "Nickel titanium instrumentation panel". Journal of Endodontics 22, n.º 8 (agosto de 1996): 442–43. http://dx.doi.org/10.1016/s0099-2399(96)80253-6.

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Waters, N. E. "Superelastic Nickel-titanium Wires". British Journal of Orthodontics 19, n.º 4 (noviembre de 1992): 319–22. http://dx.doi.org/10.1179/bjo.19.4.319.

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Suárez, Carlos, Teresa Vilar, Pablo Sevilla y Javier Gil. "In Vitro Corrosion Behavior of Lingual Orthodontic Archwires". International Journal of Corrosion 2011 (2011): 1–9. http://dx.doi.org/10.1155/2011/482485.

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Objectives. To investigate the in vitro electrochemical corrosive behavior of archwires used in lingual orthodontics and the effects on the phase transition temperatures.Materials and Methods. Six different types of archwires of stainless steel, titanium-molybdenum, nickel-titanium and nickel-titanium-copper were used. Corrosion tests were performed following ISO-standard 10993-15:2000. Differential scanning calorimetry and scanning electron microscopy were used.Results. The stainless steel archwires showed anEpitaround −600 mV, and those of titanium alloys showedEpitvalues around 1000 mV. Differential scanning calorimetry detected a rhombohedral phase in nickel-titanium archwires, while it was not detected in nickel-titanium-copper wires. A difference of 2°C to 3.5°C from the manufacturer's claim was found in the as-received and polarized samples, respectively.Conclusions. The 0.016 stainless steel archwires were found to be the less resistant to corrosion. A rhombohedral phase was detected on the nickel-titanium archwires. No major differences were observed among groups concerning phase transformation temperatures.
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Khabadze, Z. S. y F. R. Ismailov. "Investigation of cyclic fatigue of rotary endodontic instruments". Endodontics Today 20, n.º 1 (6 de abril de 2022): 28–35. http://dx.doi.org/10.36377/1683-2981-2022-20-1-28-35.

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Aim. To study the properties and resistance to cyclic loading of nickel-titanium files with a martensitic phase. The use of nickel-titanium instruments is an integral part of the endodontic treatment of root canals. During endodontic treatment, nickel-titanium instruments experience a huge load, which is manifested by fatigue of nickel-titanium instruments, in the form of a fracture.Purpose. To determine the resistance of nickel-titanium files to mechanical, chemical and temperature stress.Materials and methods. A nickel-titanium file with a martensitic S-flexi phase from Geosoft was selected as a study. Cyclic fatigue was determined using a simulation endodontic unit. Photo and video fixation was carried out as a calculation of the revolutions and breakage time of the tool in the process of determining cyclic fatigue. To assess changes in the structure of nickel-titanium instruments with a martensitic phase, electron scanning microscopy and determination of the elemental composition of the alloy were carried out.Results. In the course of the study, tests were carried out to determine the cyclic load, close to the clinical reception. After a series of cyclic load detection tests, S-flexi files showed different resistance to cyclic load. The results of cyclic fatigue are summarized in Table 1.Conclusion. High-quality and safe mechanical treatment of root canals is possible when using nickel-titanium S-flexi files. Due to the high resistance to mechanical, chemical and thermal stress.
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Elkiran, Ozlem, Cemsit Karakurt, Gulendam Kocak y Cagatay Taskapan. "Serum Nickel and Titanium Levels after Transcatheter Closure of Atrial Septal Defects with Amplatzer Septal Occluder". Cardiology Research and Practice 2019 (2 de enero de 2019): 1–6. http://dx.doi.org/10.1155/2019/7891746.

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Introduction. There is a concern about release of nickel and titanium after implantation of nitinol-containing devices.Objective. To evaluate serum nickel and titanium release after implantation of Amplatzer occluder.Materials and methods. In 38 pediatric patients with no history of nickel sensitivity, blood samples were drawn 24 hours before and 24 hours, 1, 3, 6, and 12 months after implantation. Nickel and titanium concentrations were measured by atomic absorption spectrophotometry.Results. The median serum nickel level which was 0.44 ng/mL before the implantation increased to 1.01 ng/mL 24 hours after implantation and 1.72 ng/mL one month after implantation. The maximum level was detected 3 months after implantation, with a median level of 1.96 ng/mL. During follow-up, the nickel levels decreased to those measured before implantation. Serum nickel levels at the 24th hour, 1st month, and 3rd month following implantation were found to have increased significantly. No patients showed a detectable serum titanium level.Discussion. This is the first study that evaluated both serum nickel and titanium release after implantation of the Amplatzer occluder. Our study shows that nickel is released from the device in the first few months after implantation. Therefore, in patients with nickel allergy, other devices may be considered.
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Tesis sobre el tema "Nickel-titanium"

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Barbero, Bernal Laura Isabel. "Cyclic Behavior of Superelastic Nickel-Titanium and Nickel-Titanium-Chromium Shape Memory Alloys". Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4937.

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Shape memory alloys (SMAs) are a class of alloys that display the unique ability to undergo nonlinear deformations and return to their original shape when heat is applied or the stress causing the deformation is removed. This unique shape memory characteristic is a result of a martensitic phase-change, which can be temperature induced (shape memory effect) or stress induced (superelastic effect). In this study, the cyclical behavior of NiTi, a binary shape memory alloy, is compared to the cyclical behavior of NiTiCr, a ternary SMA. The purpose of this study is to compare the behavior of a 0.085-in. diameter NiTiCr wire with the behavior of the same size NiTi wire to determine whether ternary SMAs are more viable ways to take advantage of the unique properties of SMAs for seismic applications. The experimental results showing the superelastic behavior of these alloys under cyclical tensile loading are summarized with attention to the effects of annealing temperature, strain rate, and cyclical training on the stress-strain hysteresis, maximum recoverable strain and equivalent viscous damping.
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Norfleet, David Matthew. "Sample size effects related to nickel, titanium and nickel-titanium at the micron size scale". Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1187038020.

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Norfleet, David M. "Sample size effects related to nickel, titanium and nickel-titanium at the micron size scale". The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1187038020.

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Ho, Wing-lam. "Flexural rigidity of nickel-titanium instruments". Click to view the E-thesis via HKUTO, 2003. http://sunzi.lib.hku.hk/hkuto/record/B31954297.

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Sattapan, Boonrat. "Dynamic properties of nickel-titanium instruments". Connect to thesis, 1997. http://repository.unimelb.edu.au/10187/2437.

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Root canal preparation in narrow, curved canals is a challenge even for experienced endodontists. Recently nickel-titanium (NiTi) hand files have played an important role in root canal preparation, particularly in curved root canals. Nickel-titanium endodontic instruments were first investigated in 1988 by Walia et al. who found that NiTi files have two to three times more elastic flexibility in bending and torsion, as well as superior resistance to torsional fracture compared with similar stainless steel files.
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Ho, Wing-lam y 何潁琳. "Flexural rigidity of nickel-titanium instruments". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31954297.

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Fretwell, Grant Michael. "On the biocompatibility of nickel titanium alloys". Thesis, University of Liverpool, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366485.

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Chatterjee, Sudipta. "Tribological properties of pseudo-elastic nickel-titanium". Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1610048621&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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Strutt, Elizabeth R. "Combustion synthesis, structure and transformation characteristics of titanium carbide-nickel titanium composites /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2004. http://wwwlib.umi.com/cr/ucsd/fullcit?p3129952.

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Kaya, Irfan. "SHAPE MEMORY BEHAVIOR OF SINGLE AND POLYCRYSTALLINE NICKEL RICH NICKEL TITANIUM ALLOYS". UKnowledge, 2014. http://uknowledge.uky.edu/me_etds/37.

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NiTi is the most commonly used shape memory alloy (SMA) and has been widely used for bio-medical, electrical and mechanical applications. Nickel rich NiTi shape memory alloys are coming into prominence due to their distinct superelasticity and shape memory properties as compared to near equi-atomic NiTi shape memory alloys. Besides, their lower density and higher work output than steels makes these alloys an excellent candidate for aerospace and automotive industry. Shape memory properties and phase transformation behavior of high Ni-rich Ni54Ti46 (at.%) polycrystals and Ni-rich Ni51Ti49 (at.%) single-crystals are determined. Their properties are sensitive to heat treatments that affect the phase transformation behavior of these alloys. Phase transformation properties and microstructure were investigated in aged Ni54Ti46 alloys with differential scanning calorimetry (DSC) and transmission electron microscopy (TEM) to reveal the precipitation characteristics and R-phase formation. It was found that Ni54Ti46 has the ability to exhibit perfect superelasticity under high stress levels (~2 GPa) with 4% total strain after 550°C-3h aging. Stress independent R-phase transformation was found to be responsible for the change in shape memory behavior with stress. The shape memory responses of [001], [011] and [111] oriented Ni51Ti49 single-crystals alloy were reported under compression to reveal the orientation dependence of their shape memory behavior. It has been found that transformation strain, temperatures and hysteresis, Classius-Clapeyron slopes, critical stress for plastic deformation are highly orientation dependent. The effects of precipitation formation and compressive loading at selected temperatures on the two-way shape memory effect (TWSME) properties of a [111]-oriented Ni51Ti49 shape memory alloy were revealed. Additionally, aligned Ni4Ti3 precipitates were formed in a single crystal of Ni51Ti49 alloy by aging under applied compression stress along the [111] direction. Formation of a single family of Ni4Ti3 precipitates were exhibited significant TWSME without any training or deformation. When the homogenized and aged specimens were loaded in martensite, positive TWSME was observed. After loading at high temperature in austenite, the homogenized specimen did not show TWSME while the aged specimen revealed negative TWSME.
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Libros sobre el tema "Nickel-titanium"

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Wiese, W. L. Spectroscopic data for titanium, chromium and nickel. Oak Ridge, Tenn: Controlled Fusion Atomic Data Center, Oak Ridge National Laboratory, 1989.

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G, Pushin V. y Kondratʹev V. V, eds. Nikelid titana: Struktura i svoĭstva. Moskva: "Nauka", 1992.

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Gi͡unter, V. Ė. Nikelid titana: Medit͡sinskiĭ material novogo pokolenii͡a. Tomsk: NII medit͡sinskikh materialov i implantatov s pami͡atʹi͡u formy Sibirskogo fiziko-tekhnicheskogo instituta pri Tomskom gos. universitete, 2006.

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Tietze, Holger. Phasenübergänge mit Memory Effekt: Neutronenstreuung an der Shape Memory Legierung NiTi. Frankfurt am Main: Verlag für Akademische Schriften, 1985.

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Stróż, Danuta. Oddziaływanie zniekształceń sieciowych na przebieg przemiany martenzytycznej w stopach NiTi. Katowice: Wydawnictwo Uniwersytetu Śląskiego, 2005.

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Fisher, G. T. Effects of composition and processing variables on transverse rupture strength and hardness of nickel-alloy-bonded titanium carbide. Pittsburgh, Pa: U.S. Dept. of the Interior, Bureau of Mines, 1987.

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Mines, United States Bureau of. Effects of Composition and Processing Variables on Transverse Rupture Strength and Hardness of Nickel-Alloy-Bonded Titanium Carbide. S.l: s.n, 1987.

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Institution, British Standards. Welding fusion welded joints in steel, nickel, titanium, and their alloys beam welding excluded: Quality levels for imperfections : BS EN ISO 5817:2003. London: British Standards Institute, 2003.

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L, Jerina Kenneth, ASTM International, ASTM International Committee E08 on Fatigue and Fracture y ASTM Committee F-4 on Medical and Surgical Materials and Devices, eds. Fatigue and fracture of medical metallic materials and devices: 2nd volume. West Conshohocken, PA: ASTM International, 2010.

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Oshida, Yoshiki y Toshihiko Tominaga. Nickel-Titanium Materials: Biomedical Applications. de Gruyter GmbH, Walter, 2020.

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Capítulos de libros sobre el tema "Nickel-titanium"

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Ghosh, Gautam. "Iron – Nickel – Titanium". En Iron Systems, Part 5, 259–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-70890-2_14.

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Hari Kumar, K. C. y K. Santhy. "Niobium - Nickel - Titanium". En Refractory metal systems, 480–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-00771-2_40.

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Semenova, Elena, Lazar Rokhlin, Tatiana Dobatkina y Natalia Kolchugina. "Boron – Nickel – Titanium". En Refractory metal systems, 153–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02700-0_12.

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Heller, L., B. Marvalová, J. Vlach, K. Janouchová, M. Syrovátková y J. Hanuš. "Damping Capacity of Superelastic Nickel-Titanium Plain Textiles". En Springer Proceedings in Physics, 565–72. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-2069-5_76.

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Filip, Peter. "Titanium-Nickel Shape Memory Alloys in Medical Applications". En Engineering Materials, 53–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56486-4_4.

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Predel, F. "Phase diagram of Ni-Ti (nickel-titanium) system". En Phase Equilibria, Crystallographic and Thermodynamic Data of Binary Alloys, 125. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-642-24977-8_70.

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Klocke, F., W. König y K. Gerschwiler. "Advanced Machining of Titanium- and Nickel-Based Alloys". En Advanced Manufacturing Systems and Technology, 7–21. Vienna: Springer Vienna, 1996. http://dx.doi.org/10.1007/978-3-7091-2678-3_2.

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Bhaumik, S. K., K. V. Ramaiah y C. N. Saikrishna. "Nickel–Titanium Shape Memory Alloy Wires for Thermal Actuators". En Springer Tracts in Mechanical Engineering, 181–98. New Delhi: Springer India, 2014. http://dx.doi.org/10.1007/978-81-322-1913-2_11.

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Kim, Kyubum y Samantha Daly. "The Effect of Texture on Superelasticity in Nickel-Titanium". En Conference Proceedings of the Society for Experimental Mechanics Series, 255–62. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-4235-6_36.

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Brantley, William A., Jie Liu, Scott R. Schricker, Fengyuan Zheng, John M. Nusstein, Masahiro Iijima, William A. T. Clark y Satish B. Alapati. "Characterization of Next-Generation Nickel-Titanium Rotary Endodontic Instruments". En Biomaterials Science: Processing, Properties and Applications III, 11–18. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118751015.ch2.

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Actas de conferencias sobre el tema "Nickel-titanium"

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Hackenberg, Robert. "Dynamic Properties of Nickel-Titanium Alloys". En SHOCK COMPRESSION OF CONDENSED MATTER - 2003: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP, 2004. http://dx.doi.org/10.1063/1.1780301.

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Júnio Teixeira Cândido, Aubani, Gustavo Amaral, Luciana Fernandes, Vitor Almeida, Gabriel Firmino, Suelia Rodrigues Fleury Rosa, Andrea Cristina Santos y Joziane Porcino. "Nickel-Titanium Electrode for Radiofrequency Hepatic Ablation Procedure". En 24th ABCM International Congress of Mechanical Engineering. ABCM, 2017. http://dx.doi.org/10.26678/abcm.cobem2017.cob17-1984.

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Stöckel, D. "Industrial Applications of Nickel-Titanium Shape Memory Alloys". En ESOMAT 1989 - Ist European Symposium on Martensitic Transformations in Science and Technology. Les Ulis, France: EDP Sciences, 1989. http://dx.doi.org/10.1051/esomat/198904006.

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Predki, Wolfgang y Bjo¨rn Bauer. "Safety Clutches With Nickel-Titanium Shape Memory Alloys". En ASME 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2009. http://dx.doi.org/10.1115/smasis2009-1262.

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The ability of Shape Memory Alloys (SMA) to remind two different macroscopic shapes and to alter between these shapes by changing their temperature, leads to innovative approaches within drive technology. Especially Nickel-Titanium (NiTi) Shape Memory Alloys offer high actuating forces and adjustment travel in combination with high cycle stability. The shape memory effect is based on the transformation between martensitic and austenitic microstructure depending on the temperature of the actuators. The transformation temperatures in the range of 20°C to 100°C make NiTi SMA attractive for engineering applications. This paper investigates the technical use of NiTi SMA as actuators within a safety clutch. Safety clutches serve in power trains as torque limiting elements with the aim to prevent destruction of the working machine or the motor. Based on the concept of a friction clutch the conceptual design of the NiTi safety clutch is developed and followed by the design and manufacturing of a prototype. The activation of the NiTi actuators occurs as a result of the frictional heat at the friction pads when the torque limit is exceeded and the clutch slips. The actuators transform from martensitic to austenitic condition. Their stiffness increases so that the actuators are able to open the clutch. This leads to a complete collapse of the torque. During the cooling phase the transformation from austenite to martensite occurs and the NiTi actuators are deformed again. The friction pads are clamped with their original force and the clutch is able to transmit the demanded torque. The mechanical dimensioning of the actuator system is figured out as well as the measurement results of the analysis on the testing bench. The variation of the input parameters like torque and speed and the variation of the actuator system itself show possibilities and frontiers of this technology.
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Bhaskaran, Madhu, Sharath Sriram, Anthony S. Holland y Johan du Plessis. "Nickel silicide and titanium silicide formation: a comparison". En Smart Materials, Nano- and Micro-Smart Systems, editado por Said F. Al-Sarawi. SPIE, 2006. http://dx.doi.org/10.1117/12.695939.

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Bregan, Andrew D. y Alexandre E. Volkov. "Model of plastic deformation of austenitic titanium-nickel". En Fifth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, editado por Alexander I. Melker. SPIE, 2002. http://dx.doi.org/10.1117/12.456282.

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Livingston Welch, Christian. "Nickel-Titanium Shape Memory Alloy Thermal Buoyancy Engine". En SNAME Maritime Convention. SNAME, 2013. http://dx.doi.org/10.5957/smc-2013-s02.

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Nitinol, a nickel-titanium shape memory alloy, was analyzed for its feasibility as a linear actuator to be used in a thermal buoyancy engine of an autonomous underwater ocean glider fueled by the temperature gradient of the ocean's thermocline. A nitinol mass suspension apparatus was fabricated to measure the displacement of an array of masses ranging from 0:5kg to 8kg as the wire was transitioned into its heated austenite phase, and then cooled back to its martensite phase, thus representing the expansion and contraction of a buoyancy engine piston under hydrostatic pressure. In validation of nitinol manufacturer Dynalloy; Inc: specifications, the maximum stroke observed in this dead weight bias configuration was 4:25±0:24%, only a 6% difference from the documented 4% stroke.
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Fox, Gordon, Ryan Hahnlen y Marcelo Dapino. "TIG Welding of Nickel-Titanium to 304 Stainless Steel". En ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-5154.

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Shape memory nickel-titanium (NiTi) is attractive for use in solid-state actuators as it exhibits large recoverable stresses, limited by its ultimate shear strength of over 120 ksi (960 MPa), and large recoverable strains, up to 8%. Broad application of NiTi is hindered by the expense, complexity, and lack of reliability in machining and joining it to structural materials. This paper investigates the use of orbital Tungsten Inert Gas (TIG) welding to join NiTi to 304 stainless steel (304 SS), a common structural material that can be readily machined and welded. Tubes of NiTi and 304 SS were joined using a nickel filler to mitigate the formation of brittle intermetallics. Both tubes had a 0.375 in (9.53 mm) outer diameter with wall thicknesses of 0.065 in and 0.075 in (1.7 mm and 1.9 mm) for the 304 SS and NiTi tubes, respectively. Viable joints were created and characterized through X-ray analysis, optical microscopy, hardness mapping, and strength testing. The joints had an average failure torque of 450 in-lb (52 N-m), corresponding to an ultimate shear strength of approximately 50 ksi (350 MPa). This was sufficient to detwin the NiTi in the tubes, which occurs at a shear stress of 16 ksi (110 MPa), and plastically deform the annealed 304 SS tubes. Optical microscopy and hardness mapping revealed a heat-affected zone 0.005 in (125 μm) wide with a maximum hardness of 817 HV. Outside of this heat-affected zone the hardness was not affected, indicating that no large-scale loss of superelastic or shape memory properties arises from TIG welding.
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James, Erik, Jamil Grant, Michael Alberter, Nastassja Dasque, Cynthia Price y William J. Craft. "Nickel-Titanium Shape Memory Alloy Motors and Electromechanical Devices". En ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15119.

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Shape memory alloys (SMA) have been an extensively used material for actuators in micro-electromechanical systems (MEMS) because actuation force and displacement are greatest in SMA amongst many actuator materials [1]. Of the alloys currently available for SMA actuators, the most popular system is Nitinol (or NiTi) due to its good oxidation resistance, reversible martensitic transformation, broad range of transformation temperatures (from -100 - 100 °C), and specific power density [2]. Current commercially available SMA wire has easily achieved no-load strain of 5% with medium gage SMA wires demonstrating an axial force capacity of 2 Newtons or more. While the potential use of SMA materials in a thermal-electric motor has been documented beginning in the 1980's, there are a number of new allows and fatigue-resistant materials that may lead to more general designs with a wide range of motions and applications. Shape memory alloys are a special type of material that exhibit two unique properties, pseudo-elasticity and shape memory effect (SME). SMA undergoes SME because of martensitic or diffusionless transformation where each atom has a slight displacement, creating observable changes throughout the structure as the allow changes states. This alloy has the ability, once heated, to return to its parent austenite phase where it exists at higher symmetry. Upon cooling, the material returns to one of many lower symmetry martensitic phases. This thermal cycle is shown in Figure 1. [3,4]. It is even possible for many variants of martensite to be present in the same material. Pseudo-elasticity is a rubber-like flexibility that allows the SMA to be contorted for a variety of purposes. Once contorted, the application of heat will cause the alloy to undergo martensitic transformation. Upon completion of the cycle, the alloy will have returned to its original shape. The development of SMA-based electromechanical devices delivers traditional mechanical motion with non-traditional methods. Rather than electromagnetic components rotating about a central axis to produce power, the rotary SMA motor utilizes contracting elements, and mush as spark ignition rotary engine, it can be designed to produce angular motion. Motion is accomplished with sequenced electrical signals sent across each element mounted between an eccentric crank. Rotary motion is produced during the power portion of the cycle for specific SMA elements under the application of an electrical signal. Based on this concept, our team developed a demonstration model with four active elements. We have demonstrated rotary motion of the device for an extended period of time, and we believe that macro-scale models can reduce the concept substantially and perhaps to the MEMS level.
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Gugel, H. y W. Theisen. "Microstructural investigations of laser welded dissimilar Nickel-Titanium-steel joints". En ESOMAT 2009 - 8th European Symposium on Martensitic Transformations. Les Ulis, France: EDP Sciences, 2009. http://dx.doi.org/10.1051/esomat/200905009.

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Informes sobre el tema "Nickel-titanium"

1

Miller, M. K., D. J. Larson y K. F. Russell. Characterization of segregation in nickel and titanium aluminides. Office of Scientific and Technical Information (OSTI), marzo de 1997. http://dx.doi.org/10.2172/459428.

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Wiese, T. L. y A. Musgrove. Spectroscopic Data for Titanium, Chromium, and Nickel: Volume 1. Office of Scientific and Technical Information (OSTI), enero de 1989. http://dx.doi.org/10.2172/1571908.

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Nickel, W., W. L. Wiese y A. Musgrove. Spectroscopic Data for Titanium, Chromium, and Nickel: Volume 3. Office of Scientific and Technical Information (OSTI), enero de 1989. http://dx.doi.org/10.2172/1571909.

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Chan, Andrew, Jacob Altholz, Richard Weir y Matthew Davidson. A Novel Nickel-Titanium Wire-Actuated Prosthetic Motor Clutch. Journal of Young Investigators, septiembre de 2020. http://dx.doi.org/10.22186/jyi.38.3.18-23.

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Wiese, W. L. Atomic Data for Fusion: Volume 6, Spectroscopic data for titanium, chromium, and nickel. Editado por A. Musgrove. Office of Scientific and Technical Information (OSTI), septiembre de 1989. http://dx.doi.org/10.2172/5592151.

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Hanrahan, R. J. Jr, K. C. Chen y M. P. Brady. The effects of beryllium additions on the oxidation of nickel aluminide and titanium aluminide based intermetallics. Office of Scientific and Technical Information (OSTI), diciembre de 1998. http://dx.doi.org/10.2172/307984.

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Hanrahan, R. J. Jr, K. C. Chen y M. P. Brady. The effects of beryllium additions on the oxidation of nickel aluminide and titanium aluminide based intermetallics. Office of Scientific and Technical Information (OSTI), noviembre de 1998. http://dx.doi.org/10.2172/290925.

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Sinha, V. y J. M. Larsen. Vacuum Levels Needed to Simulate Internal Fatigue Crack Growth in Titanium Alloys and Nickel-base Superalloys: Thermodynamic Considerations. Fort Belvoir, VA: Defense Technical Information Center, marzo de 2012. http://dx.doi.org/10.21236/ada559012.

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Srour, Merric D., Cory R. Knick y Christopher J. Morris. Characterization of Sputtered Nickel-Titanium (NiTi) Stress and Thermally Actuated Cantilever Bimorphs Based on NiTi Shape Memory Alloy (SMA). Fort Belvoir, VA: Defense Technical Information Center, noviembre de 2015. http://dx.doi.org/10.21236/ada623954.

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Dalder, E. y A. Goldberg. Considerations on the performance and fabrication of candidate materials for the Yucca Mountain repository waste packages highly corrosion resistant nickel-base and titanium-base alloys. Office of Scientific and Technical Information (OSTI), noviembre de 1995. http://dx.doi.org/10.2172/11311.

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