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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 48 for “"Nickel-Titanium"”.
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The nickel-titanium-carbon system
Thesis (Sc.D.) Massachusetts Institute of Technology. Dept. of Metallurgy, 1956.
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An advanced perspective on twin growth in nickel-titanium
… to investigate the attributes of twinning in Nickel-Titanium (NiTi) shape memory alloy. In particular, atomistic mechanisms of twin growth in two different phases of NiTi are characterized with barrier energy in this thesis. In addition, energetics of dislocation twin boundary interactions in …
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The fatigue crack growth behavior of superelastic nickel titanium
Understanding of fatigue crack growth phenomena in shape memory alloys under superelastic conditions continues to elude the scientific community: The stress induced martensite phase causes deviations of stress intensity and state at the tip from the classical handbook solutions widely relied on for …
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Tribological Investigation of Nickel Titanium Shape Memory Alloy (NiTi SMA) Coatings
Nickel titanium shape memory alloy (NiTi SMA) coatings demonstrate shape memory effects, superelasticity and excellent biocompatibility. It has been widely used in various applications such as in dentistry, orthopaedics and micro electro mechanical system. However, the application of NiTi SMA …
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Torsional Testing of Race, K3 and Profile Nickel Titanium Endodontic Files
… evaluate the static torsional properties of two nickel titanium files that have recently been introduced for use in endodontics and compare them to the same size Profile instruments. Ten new files of each brand and size were tested. The files tested were: RaCe 25 tip 0.02, 0.04, 0.06 taper, K3 …
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Seismic Performance of Square Nickel-Titanium Reinforced ECC Columns with Headed Couplers
… by using innovative materials such as Nickel-Titanium shape memory alloy bars (SMA) and engineered cementitious composites (ECC). This study focused on evaluating the performance of SMA/ECC in scaled bridge columns representing the piers of the SR-99 on-ramp structure that is scheduled …
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A new application of thermal active nickel titanium alloys: Canine retraction springs.
A new application of thermal active nickel titanium alloys: Canine retraction springs.
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A Comparison of Flexural Fracture of Three Different Nickel-Titanium Rotary File Systems
The purpose of this study was to compare the number of rotations to failure of three different rotary file systems. ProFile, Sequence, and Liberator files in sizes 25 and 40 with 0.04 taper were divided into groups of five and rotated against a grooved metal block mounted to a Universal testing …
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Nanoindentation of Annealed and As-Sputtered Thin Films of Nickel Titanium Shape Memory Alloys
… A material of interest for MEMS devices is nickel titanium (NiTi) shape memory alloy (SMA) because of the high work output (~107 J/m3). This thesis will focus on the fabrication of thin film NiTi by DC magnetron sputtering deposition and testing mechanical properties of the fabricated films …
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SODIUM HYPOCHLORITE'S EFFECT ON NICKEL-TITANIUM ROTARY INSTRUMENTS AND ITS EFFECT ON RESISTANCE TO FRACTURE
… and total immersion in sodium hypochlorite on nickel-titanium rotary files and to determine whether resistance to fracture was influenced by the immersion time. One hundred K3™ and 100 ProFile® rotary files were either partially or totally immersed in 5.25% sodium hypochlorite for zero, one, …
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Effects of topical fluoride prophylactic agents on the mechanical properties of orthodontic nickel-titanium closed coil springs
… fluoride effects on mechanical properties of nickel-titanium orthodontic closed coil springs. Unloading force and rigidity were measured at 1, 4, 8, and 12 weeks, after springs were exposed to phosphate buffered saline (PBS), PBS combined with acidulated fluoride (PBS+APF) or sodium fluoride …
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In situ diffraction investigations of mechanisms that lead to path dependent mechanical behaviours of nickel-titanium shape memory alloys
Development and characterization of Shape Memory alloys (SMAs) has taken big steps over half a century in understanding the role of alloying components, processing of alloys and microstructural optimization to real life engineering application. This has aided in the growth of application of SMAs to …
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Design, Fabrication, and Characterization of a Thin-Film Nickel-Titanium Shape Memory Alloy Diaphragm for Use in Micro-Electro-Mechanical Systems
… work done at Cal Poly has shown that thin-film nickel-titanium (NiTi) can be easily sputtered onto silicon wafers and annealed to create a crystallized shape memory alloy (SMA) film. Initial work on creating devices yielded cantilevers that were highly warped due to thin-film stress created …
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Effects of Topical Fluoride Prophylactic Agents on the Mechanical Properties of Orthodontic Nickel-Titanium Closed Coil Springs and Stainless Steel Closed Coil Springs
… agents on the mechanical unloading properties of nickel-titanium (NiTi) and stainless steel (SS) closed coil springs. Spring were stored at 37˚C under static load in phosphate buffered saline (PBS) and treated with either neutral sodium fluoride (NaF) or acidulated phosphate fluoride (APF) five …
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Coated and Uncoated Nickel-Titanium Archwires: Mechanical Property and Surface Topography Response to a Simulated Oral Environment with and without Bracket-Related Load Deflection Induced Stress
… characteristics of esthetic coated and uncoated nickel titanium archwires. Two types of coated archwires were tested: one with a rhodium ion coating and another with a polymer coating. Corresponding uncoated wires of the same size were also tested. These four different wires were divided into …
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The effect of annealing on the microstructure of Cu-Al-Ni-Mn shape memory alloy microwires
… between the austenite and martensite phases. Nickel-titanium alloys are currently the most common material used. However, due to their expensive cost, alternatives such as Cu-based alloys have been investigated. Cu-based alloys have exhibited the shape memory effect and have achieved 6-8% …
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Mechanical Behavior of Metals Under Triaxial Stress: Apparatus and Experiments
… for carburized 4320 steel, hardened 4340 steel, nickel-titanium shape memory alloy and normalized 1070 steel. For the first three materials, stress state is shown to have a dramatic effect on the yield strength, the shape of the stress-strain curves and the phase transformation behavior. Pressure …
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Copper, Aluminum and Nickel: A New Monocrystalline Orthodontic Alloy
… comprised of a blend of copper, aluminum, and nickel (CuAlNi). <strong>Methods: </strong>The sample was comprised of three shape memory alloys; CuAlNi, copper nickel titanium (CuNiTi), and nickel titanium (NiTi); from various orthodontic manufacturers in both 0.018” round and 0.019” x 0.025” …
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In search of martensite : titanium-tantalum shape-memory alloy
… (SME) and superelastic properties of various nickel-based alloys [8]. Unfortunately, there is also serious concern about the toxicity of nickel. Titanium based shape-memory alloys have been noted as potentially non-toxic replacements of the more traditional, nickel-based shape memory alloys. …
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The effect of archwire vibrations on the stick-slip behavior of the bracket-archwire interface utilizing clinically relevant tipping moments
… utilizing a friction testing apparatus, where a nickel titanium spring was attached to a wire bonded to an upper right canine bracket to create a 1500 cN-mm moment. As retraction forces were applied, the amount of time (ln, s) for each bracket configuration to move along a stainless steel wire …
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