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Dissertations / Theses on the topic 'Magnetic shape memory alloys'

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Published: 4 June 2021
Last updated: 26 July 2025

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1

Brewer, Andrew Lee. "Shape memory response of ni2mnga and nimncoin magnetic shape memory alloys under compression." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1341.

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2

Turabi, Ali S. "EFFECTS OF MAGNETIC FIELD ON THE SHAPE MEMORY BEHAVIOR OF SINGLE AND POLYCRYSTALLINE MAGNETIC SHAPE MEMORY ALLOYS." UKnowledge, 2015. http://uknowledge.uky.edu/me_etds/58.

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Magnetic Shape Memory Alloys (MSMAs) have the unique ability to change their shape within a magnetic field, or in the presence of stress and a change in temperature. MSMAs have been widely investigated in the past decade due to their ability to demonstrate large magnetic field induced strain and higher frequency response than conventional shape memory alloys (SMAs). NiMn-based alloys are the workhorse of metamagnetic shape memory alloys since they are able to exhibit magnetic field induced phase transformation. In these alloys, martensite and austenite phases have different magnetization behav
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3

Kiefer, Bjoern. "A phenomenological constitutive model for magnetic shape memory alloys." Texas A&M University, 2006. http://hdl.handle.net/1969.1/4712.

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A thermodynamics-based constitutive model is derived which predicts the nonlinear strain and magnetization response that magnetic shape memory alloys (MSMAs) exhibit when subjected to mechanical and magnetic loads. The model development is conducted on the basis of an extended thermo-magneto-mechanical framework. A novel free energy function for MSMAs is proposed, from which the constitutive equations are derived in a thermodynamically-consistent manner. The nonlinear and hysteretic nature of the macroscopic material behavior is captured through the evolution of internal state variables which
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4

Rubini, Silvia. "Martensitic transformations in shape memory alloys by nuclear magnetic resonance /." [S.l.] : [s.n.], 1992. http://library.epfl.ch/theses/?display=detail&nr=1095.

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5

Schiepp, Thomas, René Schnetzler, Leonardo Riccardi, and Markus Laufenberg. "Energy-efficient multistable valve driven by magnetic shape memory alloys." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200712.

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Magnetic shape memory alloys are active materials which deform under the application of a magnetic field or an external stress. Due to their internal friction, recognizable from the strain-stress hysteresis, this new material technology allows the design of multistable actuators. This paper describes and characterizes an innovative airflow control valve whose aperture is proportional to the deformation of the active material and thus controllable by the input voltage. The multistability of the material is partially exploited within an airflow control loop to reduce the energy losses of the val
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6

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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7

Karaca, Haluk Ersin. "Magnetic field-induced phase transformation and variant reorientation in Ni2MnGa and NiMnCoIn magnetic shape memory alloys." Thesis, [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1562.

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8

Jeong, Soon-Jong. "The effect of magnetic field on shape memory behavior in Heusler-type Ni₂MnGa-based compounds /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/10591.

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9

Sheikh, Amer. "The structure and magnetic properties of ferromagnetic shape memory alloys containing iron." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6274.

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An experimental investigation of the structural and magnetic properties of Iron based ferromagnetic shape memory alloys Pd57In25Fe18, Ti50Pd40Fe10, Ti50Pd35Fe15, FeMnSi, Fe66.7Mn26.8Si6.5 and Fe57.4Mn35Si7.6 is reported. Magnetisation measurements and high resolution powder neutron diffraction measurements were used to characterise the structural properties of each alloy. The parent phase of the Pd57In25Fe18 specimen has a FCC unit cell, space group Fm3m and lattice parameter a=6.293 ± 0.006Å. The Fe atoms are essentially equally distributed on to the 4a and 4b sites with the Pd occupying the
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10

Calchand, Nandish Rajpravin. "Modeling and control of magnetic shape memory alloys using port hamiltonian framework." Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2074/document.

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Les matériaux actifs sont des matériaux qui réagissent quand on leur applique un champ extérieur comme la température, la lumière, un champ magnétique ou un champ électrique. Ces champs changent les propriétés du matériau comme la longueur, la susceptibilité magnétique ou la permittivité électrique. Ces changements peuvent être utilisé pour faire du travail. Quelques exemples sont les matériaux piézoélectriques, qui changent de longueur quand on applique un champ électrique, les alliages à mémoire de forme qui changent leur longueur sous l’action de la température. Un matériau plus récent qu’o
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11

Laptev, Aleksej [Verfasser]. "Structural and electronic properties of Ni-Mn-Ga magnetic shape memory alloys / Aleksej Laptev." Konstanz : Bibliothek der Universität Konstanz, 2015. http://d-nb.info/109721303X/34.

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12

Gültig, Marcel [Verfasser], and M. [Akademischer Betreuer] Kohl. "Thermal Energy Harvesting based on Magnetic Shape Memory Alloys / Marcel Gültig ; Betreuer: M. Kohl." Karlsruhe : KIT-Bibliothek, 2016. http://d-nb.info/1120498244/34.

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13

Heil, Todd M. "An Investigation of the Structural and Magnetic Transitions in Ni-Fe-Ga Ferromagnetic Shape Memory Alloys." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/30231.

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The martensite and magnetic transformations in Ni-Fe-Ga ferromagnetic shape memory alloys are very sensitive to both alloy chemistry and thermal history. A series of Ni-Fe-Ga alloys near the prototype Heusler composition (X2YZ) were fabricated and homogenized at 1423 °K, and a Ni₅₃Fe₁₉Ga₂₈ alloy was subsequently annealed at various temperatures below and above the B2/L21 ordering temperature. Calorimetry and magnetometry were employed to measure the martensite transformation temperatures and Curie temperatures. Compositional variations of only a few atomic percent result in martensite start te
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14

Neumann, Kristin. "Investigation of the crystallographic and magnetic properties of Mn1+xNi2-xGa ferromagnetic shape memory alloys." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/10077.

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This thesis work addresses the characterisation of structural and magnetic properties of Ni2MnGa based Heusler alloys. The alloy series Mn1+xNi2-xGa has been investigated experimentally by magnetization measurements, X-ray and neutron scattering. The systematics is established as a function of Mn content of the magnetic and structural properties. Of particular interest is the development of the martensitic phase as a function of Mn content, its hysteresis behaviour and the influence of chemical order as established by a suitable heat treatment. A comprehensive experimental characterisation is
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15

Couch, Ronald Newton. "Development of magnetic shape memory alloy actuators for a swashplateless helicopter rotor." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3526.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2006.<br>Thesis research directed by: Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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16

Siewert, Mario [Verfasser], Peter [Akademischer Betreuer] Entel, and Peter H. [Akademischer Betreuer] Dederichs. "Electronic, magnetic and thermodynamic properties of magnetic shape memory alloys from first principles / Mario Siewert. Gutachter: Peter H. Dederichs. Betreuer: Peter Entel." Duisburg, 2012. http://d-nb.info/1029413452/34.

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17

Chmielus, Markus [Verfasser]. "Composition, structure and magneto-mechanical properties of Ni-Mn-Ga magnetic shape-memory alloys / vorgelegt von Markus Chmielus." Berlin : Logos, 2010. http://d-nb.info/1013554914/34.

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18

Hayashi, Ryoji 1968. "Effects of composition and ausaging on microstructures and magnetic shape memory response of Fe-Ni-Co-Ti alloys." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50525.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1998.<br>Includes bibliographical references (leaves 65-66).<br>Magnetic Shape-Memory (MSM) materials are a new category of actuator materials with the potential to produce both large actuator strain and rapid response. To explore the possibility of developing MSM materials based on Fe-Ni-Co-Ti alloys, the effects of chemical composition (Co/Ni ratio) and ausaging on microstructure and magnetic shapememory response were studied. A suitable choice of chemical composition and ausaging enabled the fo
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19

Gabdullin, N. "Modelling and design of high-speed, long-lifetime and large-force electromagnetic actuators based on magnetic shape memory alloys." Thesis, City, University of London, 2016. http://openaccess.city.ac.uk/16130/.

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The main topic of this research is modelling and design of high-speed, large-force and long life-time electromagnetic actuators based on Magnetic Shape Memory (MSM) alloys. These relatively new “smart” alloys that change shape in magnetic fields possess very promising properties such as large strain, considerable output stress and potentially very long fatigue life. However, there is still lack of a consistent design methodology for MSM-based devices which can be implemented using techniques common for engineering design. In order to bridge this gap, a modelling approach for MSM element in act
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20

Xu, Nan. "Study on phase stability, structural and magnetic properties of Ni-Mn-Ga ferromagnetic shape memory alloys by ab initio calculations." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0106.

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Les alliages ferromagnétiques à mémoire de forme (FSMAs: Ferromagnetic shape memory alloys) avec des compositions proches de Ni2MnGa ont attiré beaucoup d’attention en raison de leur effet de mémoire de forme gigantesque et de leur réponse rapide et dynamique. Dans ce travail, une investigation de ces matériaux via des calculs ab initio est effectuée en utilisant la théorie de la fonctionnelle de la densité (DFT) à l’aide du logiciel VASP. Pour la composition stoechiométrique de Ni2MnGa, alliage ferromagnétique à mémoire de forme, l'oscillation du moment magnétique de Ni qui dépend du réarrang
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21

Caputo, Matthew P. "4-Dimensional Printing and Characterization of Net-Shaped Porous Parts Made from Magnetic Ni-Mn-Ga Shape Memory Alloy Powders." Youngstown State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1525436335401265.

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22

Auge, Alexander [Verfasser]. "The magnetic shape memory alloy Ni-Mn-Sn in thin films / Alexander Auge. Fakultät für Physik." Bielefeld : Universitätsbibliothek Bielefeld, Hochschulschriften, 2012. http://d-nb.info/1025951700/34.

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23

Happel, Julius, René Schnetzler, and Markus Laufenberg. "Multistable valve technology with magnetic shape memory alloy as passive element activated by a bidirectional solenoid actuator." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71264.

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Magnetic Shape Memory (MSM) alloys show a superelastic behaviour with possible deformation rates up to 6% until 12% and a sufficient lifetime performance [1, 2]. In this paper, a passive application for a superelastic Ni-Mn-Ga-alloy is presented by using the MSM element as an accurately defined inner friction in a system of a multistable actuator, in particular a multistable proportional valve. The multistable valve is characterized by a currentless holding of the valve displacement in any position of the stroke. This circumstance makes the concept a very low energy consumption valve, compared
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24

Bai, Jing. "Study on structural, electronic and magnetic properties of Ni-Mn-Ga and Ni-Mn-In ferromagnetic shape memory alloy systems." Thesis, Metz, 2011. http://www.theses.fr/2011METZ016S/document.

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Les Alliages à Mémoire de Forme Ferromagnétiques (AMFF) sont de nouveaux matériaux intelligents qui présentent des déformations induites par l’application d’un champ magnétique pouvant aller jusqu’à 10%. Ainsi, ils ont un fort potentiel pour de nombreuses applications technologiques. En outre, les couplages forts entre le champ magnétique et la structure dans ces matériaux rendent le phénomène « mémoire » très intéressant d'un point de vue scientifique. Ce travail présente une investigation de ces matériaux via des calculs ab initio effectues en utilisant la théorie de la fonctionnelle de la d
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25

Müller, Christian, I. Neckel, M. Monecke, et al. "Transformation of epitaxial NiMnGa/InGaAs nanomembranes grown on GaAs substrates into freestanding microtubes." Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-209795.

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We report the fabrication of Ni2.7Mn0.9Ga0.4/InGaAs bilayers on GaAs (001)/InGaAs substrates by molecular beam epitaxy. To form freestanding microtubes the bilayers have been released from the substrate by strain engineering. Microtubes with up to three windings have been successfully realized by tailoring the size and strain of the bilayer. The structure and magnetic properties of both, the initial films and the rolled-up microtubes, are investigated by electron microscopy, X-ray techniques and magnetization measurements. A tetragonal lattice with c/a = 2.03 (film) and c/a = 2.01 (tube) is id
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26

Fall, Mame-Daro. "Mesure et modélisation multiéchelle du comportement thermo-magnéto-mécanique des alliages à mémoire de forme." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLN013/document.

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Le comportement des alliages à mémoire de forme (AMF) et des alliages à mémoire de forme magnétiques (AMFM) est régi par les mécanismes de transformation martensitique à l'échelle de la microstructure, à l'origine de leurs propriétés remarquables (mémoire de forme, superélasticité, grandes déformations associées à la réorientation martensitique sous champ magnétique). Les mécanismes de transformation et de réorientation martensitique peuvent être induits par des sollicitations thermiques, magnétiques et / ou mécaniques et de manière couplée. La mise au point d'outils de conception fiables néce
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27

Sánchez, Diana Lizeth Torres. "Magnetic properties of NiTi/(Ni, Co) heterostructures." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-28082018-230553/.

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This thesis focuses on the role of interfacial strain in heterostructures to modify the magnetism of thin ferromagnetic films due to the inverse magnetostrictive effect, defined as the change of magnetization produced in ferromagnetic materials by an external stress. Thus, the magnetic control can be obtained without applying an external field by using heterostructures composed of a non-magnetic layer characterized by a temperature-driven structural phase transition coupled to a ferromagnetic layer. In such heterostructures, the magnetization of the ferromagnetic layer is modified through chan
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28

Underhill, Daniel Martin Lennard. "Ferromagnetic shape memory alloys." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607746.

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29

Heczko, Martin. "Počítačové modelování hranic dvojčatění ve slitinách s tvarovou pamětí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-416633.

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This Master‘s thesis is focused on theoretical study of twinning in magnetic shape memory alloys based on Ni2MnGa using ab initio calculations of electronic structure within the projector augmented wave method. In particular, the effect of increasing concentration of manganese at the expense of gallium was studied on total energy and stress profiles along different deformation paths in the (10-1)[101] shear system of non-modulated martensite. Further, this work deals with the effect of the concentration of manganese on the energy of planar fault caused by presence of partial dislocation due to
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30

Kelly, Brian L. "Beam shape control using shape memory alloys." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA358806.

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Thesis (M.S. in Astronautical Engineering) Naval Postgraduate School, December 1998.<br>"December 1998." Thesis advisor(s): Brij N. Agrawal, Gangbing Song. Includes bibliographical references (p. 55). Also available online.
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31

Torquato, Filho Evandro Alves. "Desenvolvimento de indutor variável com fio com memória de forma." Universidade Federal da Paraíba, 2016. http://tede.biblioteca.ufpb.br:8080/handle/tede/8963.

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Submitted by Maike Costa (maiksebas@gmail.com) on 2017-05-24T13:42:31Z No. of bitstreams: 1 arquivototal.pdf: 3782473 bytes, checksum: 32dae2c7c7f319bb1f74f7a9be6d1239 (MD5)<br>Made available in DSpace on 2017-05-24T13:42:31Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 3782473 bytes, checksum: 32dae2c7c7f319bb1f74f7a9be6d1239 (MD5) Previous issue date: 2016-05-25<br>Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq<br>The Shape Memory Alloys (SMA) is part of an active material class due to a special characteristic, called Shape Memory Effect (SME) that can
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32

Dai, Liyang. "Elasticity in ferromagnetic shape memory alloys." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/2047.

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Thesis (Ph.D.) -- University of Maryland, College Park, 2004.<br>Thesis research directed by: Material Science and Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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33

Seaton, Alexander B. "Thermomechanical deformation of shape memory alloys." Thesis, Loughborough University, 2006. https://dspace.lboro.ac.uk/2134/20317.

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NiTi is a shape memory alloy and can undergo crystallographically reversible martensitic transformation under applied loads resulting in recoverable of strains of the order of 5 %. The single crystal properties of shape memory alloys have been studied extensively in the past and a good understanding of the mechanical properties of the material in this form has been acquired. However, when used in practical applications shape memory alloys are used in their polycrystalline form. In a polycrystalline form the deformation behaviour may be quite different to that of a single crystal due to the con
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34

Vieira, Luís Manuel Alberty. "Laser welding of shape memory alloys." Master's thesis, Faculdade de Ciências e Tecnologia, 2010. http://hdl.handle.net/10362/4760.

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Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do grau de Mestre em Engenharia Mecânica<br>A necessidade de desenvolver técnicas avançadas de união para ligas com memória de forma tem-se revelado um assunto da maior importância, uma vez que as suas propriedades funcionais,nomeadamente o efeito de memória de forma e a superelasticidade, se revestem de enorme valor para aplicações actuais ou emergentes. De entre as ligas com memória de forma, o NiTi é a mais aplicada em campos tecnológicos tão diversos como a indústria biomédica, aerosp
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35

Kockar, Benat. "Shape memory behavior of ultrafine grained NiTi and TiNiPd shape memory alloys." Thesis, [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2543.

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36

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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37

Liang, Chen. "The constitutive modeling of shape memory alloys." Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-08232007-113153/.

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38

Page, David Gordon. "Electrodeposition of thin film shape memory alloys." Thesis, University of Newcastle Upon Tyne, 2001. http://hdl.handle.net/10443/470.

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There is considerable potential for the use of thin film shape memory alloys in the field of microtechnology due to their high power to volume ratio. The main obstacles for fabrication arise mainly due to the narrow regime over which shape memory behaviour is observed and the paucity of process techniques. Shape memory transition in brass only occurs in the alloy composition range 38.5 - 41.6 wt %% zinc. This study used a pyrophosphate electrolyte containing Cu2P2O7, Zn2P2O7 salts and an excess of K4P207 and KNO3, for brass deposition as a replacement for cyanide electrolytes because it is non
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39

Hartwell, Ashley (Ashley Jessica). "Shape Memory Alloys for small scale actuation." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/118714.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2018.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 51-52).<br>Shape Memory Alloys (SMAs), materials that can undergo a fully recoverable strain change due to a thermal cycle, and which can be produced in a form that is superelastic are only utilized limitedly. In this thesis, I investigated the relationship between the material properties of shape memory alloy micro-wires and their mechanical performance. This study was conducted with two main types of SMAs, the
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40

Guo, Weimin M. Eng Massachusetts Institute of Technology. "Orthopaedic applications of ferromagnetic shape memory alloys." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45957.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2008.<br>Includes bibliographical references (leaves 36-40).<br>Ferromagnetic shape memory alloys (FSMAs) are a new class of magnetic field-actuated active materials with no current commercial applications. By applying a magnetic field of around 0.4 T, they can exert a stress of approximately 1.5 MPa, exhibiting a strain of up to 6%. This thesis evaluates their technical and commercial feasibility in orthopaedic applications. Remote actuation is a key advantage FSMAs have over current implant m
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Kelly, Alex Bhattacharya Kaushik Murray RIchard M. "A constitutive relation for shape-memory alloys /." Diss., Pasadena, Calif. : California Institute of Technology, 2009. http://resolver.caltech.edu/CaltechETD:etd-09292008-204618.

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42

Zhang, Yahui. "Low cycle fatigue of shape memory alloys." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLY004/document.

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Dans cette thèse, nous proposons une analyse globale multi-échelles de la fatigue à faible nombre de cycles des matériaux à mémoire de forme (MMF). Dans un premier temps, une large campagne d’essais a été menée pour différents chargements thermomécaniques comprenant des tests de fatigue sous contrainte et déformation imposée et pour différentes fréquences de chargement. A partir des résultats des essais, un critère de fatigue, basé sur l’énergie de déformation, a été développé ; on montre que l’énergie de déformation est un paramètre pertinent pour prédire la fatigue des MMF en tenant compte d
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Zhang, Yahui. "Low cycle fatigue of shape memory alloys." Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLY004.

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Dans cette thèse, nous proposons une analyse globale multi-échelles de la fatigue à faible nombre de cycles des matériaux à mémoire de forme (MMF). Dans un premier temps, une large campagne d’essais a été menée pour différents chargements thermomécaniques comprenant des tests de fatigue sous contrainte et déformation imposée et pour différentes fréquences de chargement. A partir des résultats des essais, un critère de fatigue, basé sur l’énergie de déformation, a été développé ; on montre que l’énergie de déformation est un paramètre pertinent pour prédire la fatigue des MMF en tenant compte d
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44

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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45

Wang, Xirui. "Magnetic-actuated electrospun shape memory mats." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/50778.

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Shape memory materials are the materials that can be deformed and fixed to a temporary shape and recover their original shape on exposure to external stimulus. Shape memory properties have been widely used for various applications such as actuators, adaptive mateirals and so on. This study firstly imparts this special property to nanofibers in light of various advantages including nanoporous structure, excellent recoverability and good biocompatibility. Then magnetite nanoparticles are incorporated into this system to realize the magnetic actuation of shape memory effect. In the first stage, p
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46

Friend, C. M. "Factors affecting reversible shape-memory." Thesis, University of Surrey, 1985. http://epubs.surrey.ac.uk/847449/.

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In the last twenty years Reversible Shape-Memory (RSM) alloys have become the source of considerable technological interest as a result of their ability to generate spontaneous and reversible changes of shape on thermal cycling. This has led to the development of a range of reversible shape-memory devices for thermostatic sensing applications. In these devices the alloy is subjected to several thousand shape-memory cycles and the stability of the reversible shape-memory is therefore an important alloy property. Data on the effect of shape-memory cycling on the long-term stability of the revers
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47

Fung, Cheung Kwan. "Thermal mechanical behaviour of NiTi shape memory alloy." access abstract and table of contents access full-text, 2004. http://libweb.cityu.edu.hk/cgi-bin/ezdb/dissert.pl?msc-ap-b21174076a.pdf.

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Thesis (M.Sc.)--City University of Hong Kong, 2004.<br>At head of title: City University of Hong Kong, Department of Physics and Materials Science, Master of Science in materials engineering & nanotechnology dissertation. Title from title screen (viewed on Aug. 31, 2006) Includes bibliographical references.
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48

Penar, Bradley W. "Recentering Beam-Column Connections Using Shape Memory Alloys." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7185.

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Shape memory alloys are a class of alloys that display the unique ability to undergo large plastic deformations and return to their original shape either through the application of heat (shape memory effect) or by relieving the stress causing the deformation (superelastic effect). This research takes advantage of the unique characteristics of shape memory alloys in order to provide a moment resisting connection with recentering capabilities. In this study, superelastic Nitinol, a nickel-titanium form of shape memory alloy that exhibits a flag-shaped stress versus strain curve, is used as the
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Tarhan, Elif. "Ageing Characteristics Of Copper Based Shape Memory Alloys." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/3/593541/index.pdf.

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Martensite-to-Beta transformation temperatures of CuAlNiMn and CuAlNi shape memory alloys has been determined by differential scanning calorimetry (DSC). In CuAlNiMn alloys, each new betatizing treatment has resulted in randomly varying transformation temperatures on the same specimen and an anomalously diffuse and serrated Martensite-to-Beta transformation peaks in the first cycle. Therefore, as quenched alloy samples were thermally cycled for three times in DSC prior to ageing to obtain thermally stable and reproducible transformation temperatures and to eliminate the anomalous effect of bet
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Penrod, Luke Edward. "Fabrication and characterization of porous shape memory alloys." Texas A&M University, 2003. http://hdl.handle.net/1969.1/145.

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This work details an investigation into the production of porous shape memory alloys (SMAs) via hot isostatic press (HIP) from prealloyed powders. HIPing is one of three main methods for producing porous SMAs, the other two are conventional sintering and selfpropagating hightemperature synthesis (SHS). Conventional sintering is characterized by its long processing time at near atmospheric pressure and samples made this way are limited in porosity range. The SHS method consists of preloading a chamber with elemental powders and then initiating an explosion at one end, which then propagates thro
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