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Dissertations / Theses on the topic 'High strength shape memory alloy'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

Toker, Guher P. "CHARACTERIZATION OF THE SHAPE MEMORY BEHAVIOR OF HIGH STRENGTH NiTiHfPd SHAPE MEMORY ALLOYS." UKnowledge, 2018. https://uknowledge.uky.edu/me_etds/114.

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NiTiHf alloys have emerged as potential materials for applications requiring high transformation temperatures (> 100 °C) with high strength and work output. Although they have high transformation temperatures, their low damping capacity, brittleness and poor superelastic responses (of Ti-rich NiTiHf) impedes their wider usage in many industrial applications. In this study, the quaternary alloying element of Pd has been added to NiTiHf alloys to improve and tailor their shape memory behavior,. NiTiHfPd alloys were systematically examined regarding the composition and heat treatments effects. Ef

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2

Saghaian, Sayed M. "SHAPE MEMORY BEHAVIOR OF SINGLE CRYSTAL AND POLYCRYSTALLINE Ni-RICH NiTiHf HIGH TEMPERATURE SHAPE MEMORY ALLOYS." UKnowledge, 2015. http://uknowledge.uky.edu/me_etds/65.

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NiTiHf shape memory alloys have been receiving considerable attention for high temperature and high strength applications since they could have transformation temperatures above 100 °C, shape memory effect under high stress (above 500 MPa) and superelasticity at high temperatures. Moreover, their shape memory properties can be tailored by microstructural engineering. However, NiTiHf alloys have some drawbacks such as low ductility and high work hardening in stress induced martensite transformation region. In order to overcome these limitations, studies have been focused on microstructural engi

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3

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.%

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4

Acar, Emre. "PRECIPITATION, ORIENTATION AND COMPOSITION EFFECTS ON THE SHAPE MEMORY PROPERTIES OF HIGH STRENGTH NiTiHfPd ALLOYS." UKnowledge, 2014. http://uknowledge.uky.edu/me_etds/40.

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NiTiHf high temperature shape memory alloys are attractive due to their high operating temperatures (>100 oC) and acceptable transformation strain compared to NiTi. However, NiTiHf has limitations due to their lack of ductility and low strength, resulting in poor shape memory properties. In this study, Pd has been added to NiTiHf alloys in an attempt to improve their shape memory behavior. A combined approach of quaternary alloying and precipitation strengthening was used. The characterization of a Ni45.3Ti29.7Hf20Pd5 (at. %) polycrystalline alloy was performed in compression after selected ag

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5

Simon, Anish Abraham. "Shape memory response and microstructural evolution of a severe plastically deformed high temperature shape memory alloy (NiTiHf)." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/3139.

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NiTiHf alloys have attracted considerable attention as potential high temperature Shape Memory Alloy (SMA) but the instability in transformation temperatures and significant irrecoverable strain during thermal cycling under constant stress remains a major concern. The main reason for irrecoverable strain and change in transformation temperatures as a function of thermal cycling can be attributed to dislocation formation due to relatively large volume change during transformation from austenite to martensite. The formation of dislocations decreases the elastic stored energy, and during back tra

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6

Patman, Andrew J. "High strain rate properties of a near equi-atomic NiTi shape memory alloy." Thesis, Loughborough University, 2009. https://dspace.lboro.ac.uk/2134/14565.

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The effects of strain rate and testing temperature on the mechanical response of a near equi-atomic NiTi alloy have been investigated. All experiments have been conducted in compression, at testing temperatures of room .temperature (-20°C), 30°C, 40°C and 50°C. Quasi-static experiments were performed using a Hounsfield HK50 universal testing machine, and high strain rate measurements were obtained using the split Hopkinson pressure bar technique. The primary differences in the behaviour of the material within these deformation rate regimes appeared to be the presence of a possible transformati

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7

Nicholson, Douglas E. "Thermomechanical behavior of high-temperature shape memory alloy Ni-Ti-Pd-Pt actuators." Master's thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4814.

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To date the commercial use of shape memory alloys (SMAs) has been mostly limited to binary NiTi alloys with transformation temperatures approximately in the -100 to 100 &"186;C range. In an ongoing effort to develop high-temperature shape memory alloys (HTSMAs), ternary and quaternary additions are being made to binary NiTi to form NiTi-X (e.g., X: Pd, Pt, Au and Hf) alloys. Stability and repeatability can be further increased at these higher temperatures by limiting the stress, but the tradeoff is reduced work output and stroke. However, HTSMAs operating at decreased stresses can still be use

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8

Gu, Xiaojun. "Optimization of Shape Memory Alloy Structures with Respect to Fatigue." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLY012/document.

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Cette thèse présente une approche globale d’optimisation vis-à-vis de la fatigue des matériaux et structures en alliages à mémoire de forme (AMF). Cette approche s’articule en trois étapes : i) Le développement d’une loi de comportement capable de prédire la réponse thermomécanique à l’état stabilisé d’une structure en AMF sous chargement cyclique multiaxial non proportionnel. On prend notamment en compte la dépendance de la déformation résiduelle par rapport à la température. Par ailleurs, la méthode LATIN à grand incrément de temps a été généralisée pour les AMF dans le cadre du modèle ZM. C

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9

Lu, Xuemei 1970. "A systems approach to modelling and design of high strain shape memory alloy actuators /." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28000.

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A simulator is developed to model and design high strain shape memory alloy (SMA) tension actuators. The simulator may be used to predict characteristics of a given actuator, or to design its geometry under specifications such as force, speed, stroke and size. The accuracy of the model is verified experimentally in reference to an existing NiTi shape memory alloy prototype actuator. Having developed some confidence in the model, the performance of the proposed actuation mechanism is compared to other existing technologies. In particular, the force-displacement and speed characteristics of a mi

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10

Lu, Xuemei. "A systems approach to modelling and design of high strain shape memory alloy actuators." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ37267.pdf.

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11

Carl, Matthew A. "Alloy Development and High-Energy X-Ray Diffraction Studies of NiTiZr and NiTiHf High Temperature Shape Memory Alloys." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1157525/.

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NiTi-based shape memory alloys (SMAs) offer a good combination of high-strength, ductility, corrosion resistance, and biocompatibility that has served them well and attracted the attention of many researchers and industries. The alloys unique thermo-mechanical ability to recover their initial shape after relatively large deformations by heating or upon unloading due to a characteristic reversible phase transformation makes them useful as damping devices, solid state actuators, couplings, etc. However, there is a need to increase the temperature of the characteristic phase transformation above

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12

Gradin, Henrik. "Heterogeneous Integration of Shape Memory Alloysfor High-Performance Microvalves." Doctoral thesis, KTH, Mikrosystemteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-94088.

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This thesis presents methods for fabricating MicroElectroMechanical System (MEMS) actuators and high-flow gas microvalves using wafer-level integration of Shape Memory Alloys (SMAs) in the form of wires and sheets. The work output per volume of SMA actuators exceeds that of other microactuation mechanisms, such as electrostatic, magnetic and piezoelectric actuation, by more than an order of magnitude, making SMA actuators highly promising for applications requiring high forces and large displacements. The use of SMAs in MEMS has so far been limited, partially due to a lack of cost efficient an

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13

Stebner, Aaron P. "Development, Characterization, and Application of Ni_19.5Ti_50.5Pd₂₅Pt₅ High-Temperature Shape Memory Alloy Helical Actuators." Akron, OH : University of Akron, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1194994008.

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Thesis (M.S.)--University of Akron, Dept. of Mechanical Engineering, 2007.<br>"December, 2007." Title from electronic thesis title page (viewed 02/22/2008) Advisor, D. Dane Quinn; Co-Advisor, Graham Kelly; Department Chair, Celal Batur; Dean of the College, George K. Haritos; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.

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14

Young, Avery W. "A Study on NiTiSn Low-Temperature Shape Memory Alloys and the Processing of NiTiHf High-Temperature Shape Memory Alloys." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1157642/.

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Shape memory alloys (SMAs) operating as solid-state actuators pose economic and environmental benefits to the aerospace industry due to their lightweight, compact design, which provides potential for reducing fuel emissions and overall operating cost in aeronautical equipment. Despite wide applicability, the implementation of SMA technology into aerospace-related actuator applications is hindered by harsh environmental conditions, which necessitate extremely high or low transformation temperatures. The versatility of the NiTi-based SMA system shows potential for meeting these demanding materia

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15

Yu, Hao. "Modeling of High Strain Rate Compression of Austenitic Shape Memory Alloys." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1062835/.

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Shape memory alloys (SMAs) exhibit the ability to absorb large dynamic loads and, therefore, are excellent candidates for structural components where impact loading is expected. Compared to the large amount of research on the shape memory effect and/or pseudoelasticity of polycrystalline SMAs under quasi-static loading conditions, studies on dynamic loading are limited. Experimental research shows an apparent difference between the quasi-static and high strain rate deformation of SMAs. Research reveals that the martensitic phase transformation is strain rate sensitive. The mechanism for the ma

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16

Xie, Oliver Hongchun Zhou Jack. "Design, simulation and experimental study of shape memory alloy and micro-motor activated high pressure optical cell for bio-physical studies /." Philadelphia, Pa. : Drexel University, 2007. http://hdl.handle.net/1860/2525.

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17

Zhang, Shaobin. "High frequency magnetic field-induced strain of ferromagnetic shape memory alloys." Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLY011.

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Les alliages à mémoire de forme ferromagnétique (FSMAs) possèdent la capacité d’accommoder une large déformation réversible à haute fréquence à l’aide d'une réorientation de la martensite induite par un champ magnétique. Cependant, cette réorientation à haute fréquence induit un frottement au niveau des interfaces entre les variantes de martensite provoquant une dissipation et par suite une élévation significative de la température dans le matériau, ce qui pose des problèmes d'instabilité nuisant à la performance du comportement dynamique des FSMAs. En particulier, l'amplitude de la déformatio

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18

Qiu, Ying. "Influence of High Strain Rate Compression on Microstructure and Phase Transformation of NiTi Shape Memory Alloys." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849732/.

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Since NiTi shape memory alloy (SMA) was discovered in the early 1960s, great progress has been made in understanding the properties and mechanisms of NiTi SMA and in developing associated products. For several decades, most of the scientific research and industrial interests on NiTi SMA has focused on its superelastic applications in the biomedical field and shape memory based “smart” devices, which involves the low strain rate (around 0.001 s^-1) response of NiTi SMA. Due to either stress-induced martensite phase transformation or stress induced martensite variant reorientation under the appl

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19

Gantz, Faith. "Processing, Pre-Aging, and Aging of NiTi-Hf (15-20 at%) High Temperature Shape Memory Alloy from Laboratory to Industrial Scale." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1752389/.

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The overarching goal of this research was to generate a menu of shape memory alloys (SMAs) actuator materials capable of meeting the demands of aerospace applications. Material requirements were recognized to meet the demand for high temperature SMAs with actuating temperatures above 85 °C and provide material options capable of performing over 100K actuation cycles. The first study is a preliminary characterization for the down selection of Ni-rich NiTiHf15 compositions chosen for a more in-depth examination of the nano-precipitation and evolution of the H-phase. To make this selection, the e

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20

Cayeux, Soline de. "Modification des propriétés superficielles d'un alliage à mémoire de forme par construction en milieu électrochimique de films de polymère." Mulhouse, 1995. http://www.theses.fr/1995MULH0390.

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Le dépôt d'un revêtement sur la surface d'un alliage à mémoire de forme (AMF) est un problème rendu complexe par les déformations mécaniques importantes, réversibles et répétées subies par ces matériaux en cours d'usage (effet mémoire double sens, superélasticité). L'électropolymérisation sous polarisation cathodique a conduit à la construction de films de polyacrylonitrile (PAN) de 100 à 200 m d'épaisseur et de polyméthacrylonitrile (PDAN) de 15 micromètres d'épaisseur chimiquement greffés sur la surface d'un AMF à base de cuivre (Cu-Zn-Al). L'utilisation conjuguée de techniques électrochimiq

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21

Liu, Jun-Xiu, and 劉俊秀. "The High-Temperature Superplastic Properties of Air-Melted CuZnAlZr Shape Memory Alloy." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/20632335844915710292.

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22

Vitorino, Diogo Miguel Mendes Ferreira. "Tungsten inert gas welding of ni-rich NiTiHf high temperature shape memory alloy." Master's thesis, 2019. http://hdl.handle.net/10362/92300.

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23

Tu, Chun-Hsiang, and 凃竣翔. "Effect of Heat Treatment on Transformation Behaviors of Ti48.5Ni49.5Fe2 Shape Memory Alloy and Mechanical Properties of HfNbTiZr High Entropy Alloy." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/3a9y7m.

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碩士<br>國立臺灣大學<br>材料科學與工程學研究所<br>107<br>In this study, the effect of heat treatment on transformation behaviors of Ni-rich Ti48.5Ni49.5Fe2 shape memory alloy (SMA) and on mechanical properties of equiatomic HfNbTiZr high entropy alloy (HEA) are systematically studied. Ti48.5Ni49.5Fe2 SMA exhibits strain glass transition in as solution-treated state, and a B2↔R transformation induced by Ti3Ni4 ppts when the specimens aged at 300 ºC/ 350 ºC. When the specimens aged at 400 ºC/500 ºC, a two-stage R-phase transformation, which was followed by a R↔B19’ transformation occurs, in which the R-phase trans

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24

Shastry, Vyasa Vikasa. "Some Processing and Mechanical Behavior Related Issues in Ti-Ni Based Shape Memory Alloys." Thesis, 2013. http://hdl.handle.net/2005/2839.

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Shape memory alloys (SMAs) exhibit unique combination of structural and functional properties and hence have a variety of current and potential applications. The mechanical behaviour of SMAs, in particular the influence of processing on the microstructure, which in turn influences the performance of the alloy, mechanical properties at the nano-scale, and under cyclic loading conditions, are of great current interest. In this thesis, specific issues within each of these broad areas are examined with a view to suggest further optimize/characterize SMAs. They are the following: (a) For thermo-mec

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25

Dadda, Jayaram [Verfasser]. "Thermomechanical and microstructural characterization of Co49Ni21Ga30 and Co38Ni33Al29 high-temperature shape memory alloy single crystals / von Jayaram Dadda." 2009. http://d-nb.info/994347243/34.

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26

Gustmann, Tobias. "Selektives Laserschmelzen von Kupfer-Basis-Formgedächtnislegierungen." Doctoral thesis, 2018. https://tud.qucosa.de/id/qucosa%3A32312.

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Kupferbasierte Legierungen mit Formgedächtniseffekt (z.B. Cu-Al-Ni-Mn) sind vergleichsweise kostengünstige Vertreter im Bereich der Hochtemperatur-Formgedächtnislegierungen mit vielversprechenden Umwandlungseigenschaften. Üblicherweise werden diese über konventionelle schmelzmetallurgische Prozesse hergestellt und dann einer thermomechanischen Behandlung unterzogen. Für die vorliegende Arbeit wurden die Formgedächtnislegierungen Cu-11.85Al-3.2Ni-3Mn und Cu-11,35Al-3,2Ni-3Mn-0,5Zr (m-%) unter Nutzung des selektiven Laserschmelzens (Selective Laser Melting – SLM) verarbeitet und Bauteile, nach e

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