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Journal articles on the topic 'Shape memory alloys'

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Published: 4 June 2021

Last updated: 1 August 2024

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1

Wayman, C. M. "Shape Memory Alloys." MRS Bulletin 18, no. 4 (April 1993): 49–56. http://dx.doi.org/10.1557/s0883769400037350.

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Numerous metallic alloys are now known to exhibit a shape memory effect through which an article deformed at a lower temperature will regain its original undeformed shape when heated to a higher temperature. This behavior is basically a consequence of a martensitic phase transformation. When compared, the various shape memory materials are found to have common characteristics such as atomic ordering, a thermoelastic martensitic transformation that is crystallographically reversible, and a martensite phase that forms in a self-accommodating manner. The explanation of the shape memory phenomenon is now universal and well in hand. In addition to the familiar “one-way” memory, shape memory alloys also exhibit a “two-way” memory as well and a “mechanical” shape memory resulting from the formation and reversal of stressinduced martensite.Fundamental to the shape memory effect (SME) is the occurrence of a martensitic phase transformation and its subsequent reversal Basically, a shape memory alloy (SMA) is deformed in the martensitic condition (martensite), and the shape recovery occurs during heating when the specimen undergoes a reverse transformation of the martensite to its parent phase. This is the essence of the shape memory effect. Materials that exhibit shape memory behavior also show a two-way shape memory, as well as a phenomenon called superelasticity. These are also discussed.The shape memory response after deformation and thermal stimulation constitutes “smart” behavior, i.e., Stimulated Martensite-Austenite Reverse Transformation.

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2

Hoh, Daniel J., Brian L. Hoh, Arun P. Amar, and Michael Y. Wang. "SHAPE MEMORY ALLOYS." Operative Neurosurgery 64 (May 2009): ons199—ons215. http://dx.doi.org/10.1227/01.neu.0000330392.09889.99.

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3

Tadaki, T., K. Otsuka, and K. Shimizu. "Shape Memory Alloys." Annual Review of Materials Science 18, no. 1 (August 1988): 25–45. http://dx.doi.org/10.1146/annurev.ms.18.080188.000325.

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4

Schetky, L. McD. "Shape Memory Alloys." JOM 39, no. 3 (March 1987): 61. http://dx.doi.org/10.1007/bf03258890.

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5

Adiguzel, Osman. "Thermoelastic and Pseudoelastic Characterization of Shape Memory Alloys." International Journal of Materials Science and Engineering 5, no. 3 (2017): 95–101. http://dx.doi.org/10.17706/ijmse.2017.5.3.95-101.

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6

Khan, Mohammad Ibraheem, Andrew Pequegnat, and Y. Norman Zhou. "Multiple Memory Shape Memory Alloys." Advanced Engineering Materials 15, no. 5 (February 15, 2013): 386–93. http://dx.doi.org/10.1002/adem.201200246.

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7

Planes, Antoni, and Lluís Mañosa. "Ferromagnetic Shape-Memory Alloys." Materials Science Forum 512 (April 2006): 145–52. http://dx.doi.org/10.4028/www.scientific.net/msf.512.145.

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The magnetic shape-memory effect is a consequence of the coupling between magnetism and structure in ferromagnetic alloys undergoing a martensitic transformation. In these materials large reversible strains can be magnetically induced by the rearrangement of the martensitic twin-variant structure. Several Heusler and intermetallic alloys have been studied in connec- tion with this property. In this paper we will focus on the Ni-Mn-Ga Heusler alloy which is considered to be the prototypical magnetic shape-memory alloy. After a brief summary of the general properties of this class of materials, we will present recent results of relevance for the understanding of the effect of magnetism on the martensitic transformation. Finally, we will discuss the requirements for the occurrence of the magnetic shape-memory effect.

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8

Srivastava, Vijay, and Kanwal Preet Bhatti. "Ferromagnetic Shape Memory Heusler Alloys." Solid State Phenomena 189 (June 2012): 189–208. http://dx.doi.org/10.4028/www.scientific.net/ssp.189.189.

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Although Heusler alloys have been known for more than a century, but since the last decade there has been a quantum jump in research in this area. Heusler alloys show remarkable properties, such as ferromagnetic shape memory effect, magnetocaloric effect, half metallicity, and most recently it has been shown that it can be used for direct conversion of heat into electricity. Heusler alloys Ni-Mn-Z (Z=Ga, Al, In, Sn, Sb), show a reversible martensitic transformation and unusual magnetic properties. Other classes of intermetallic Heusler alloy families that are half metallic (such as the half Heusler alloys Ni-Mn-Sb and the full Heusler alloy Co2MnGe) are attractive because of their high Curie temperature and structural similarity to binary semiconductors. Unlike Ni-Mn-Ga, Ni-Mn-In and Ni-Mn-Sn transform from ferromagnetic austenite to non-ferromagnetic martensite. As is consistent with the Clausius-Clapeyron equation, the martensitic phase transformation can be manipulated by a magnetic field, leading to possible applications of these materials enabling the magnetic shape memory effect, energy conversion and solid state refrigeration. In this paper, we summarize the salient features of Heusler alloys, like the structure, magnetic properties and potential application of this family of alloys in industry.

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9

López, Gabriel A. "Shape Memory Alloys 2020." Metals 11, no. 10 (October 12, 2021): 1618. http://dx.doi.org/10.3390/met11101618.

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Shape memory alloys (SMAs), in comparison to other materials, have the exceptional ability to change their properties, structures, and functionality, depending on the thermal, magnetic, and/or stress fields applied[...]

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10

Bonetti, E., M. Frémond, and C. Lexcellent. "Modelling shape memory alloys." Journal de Physique IV (Proceedings) 115 (June 2004): 383–90. http://dx.doi.org/10.1051/jp4:2004115045.

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11

Ueland, Stian M., Ying Chen, and Christopher A. Schuh. "Oligocrystalline Shape Memory Alloys." Advanced Functional Materials 22, no. 10 (March 1, 2012): 2094–99. http://dx.doi.org/10.1002/adfm.201103019.

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12

Van Humbeeck, Jan. "High Temperature Shape Memory Alloys." Journal of Engineering Materials and Technology 121, no. 1 (January 1, 1999): 98–101. http://dx.doi.org/10.1115/1.2816006.

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Several alloy systems can be selected for high-temperature shape memory alloys, defined as alloys with stable reverse transformation temperatures above 120°C. However, due to the lack of minimum quality standards for stability, ductility, functional behavior and reliability, no successful applications have been realized so far. Research on high temperature shape memory alloys (HTSMA) is, nevertheless, an important topic not only for scientific reasons but also due to the market pull. This paper reviews existing systems of HTSMA pointing out their weak and strong parts.

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13

Tang, C., W. M. Huang, C. C. Wang, and H. Purnawali. "The triple-shape memory effect in NiTi shape memory alloys." Smart Materials and Structures 21, no. 8 (July 20, 2012): 085022. http://dx.doi.org/10.1088/0964-1726/21/8/085022.

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14

Tseng, Li-Wei, Po-Yu Lee, Nian-Hu Lu, Yi-Ting Hsu, and Chih-Hsuan Chen. "Shape Memory Properties and Microstructure of FeNiCoAlTaB Shape Memory Alloys." Crystals 13, no. 5 (May 22, 2023): 852. http://dx.doi.org/10.3390/cryst13050852.

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The three-point-bending shape memory properties, microstructure, and magnetic properties of Fe40.95Ni28Co17Al11.5Ta2.5B0.05 (at.%) alloys were investigated. The magnetic results showed a martensitic transformation in the samples that were aged at 700 °C for 6 and 12 h under the applied magnetic fields of 0.05 and 7 Tesla. The martensitic start temperature increased from −113 °C to −97 °C as aging times increased from 6 to 12 h. Increasing the magnetic fields from 0.05 to 7 Tesla, the transformation temperatures increased to a higher temperature. Both samples reach saturation magnetization (140 emu/g) under 7 Tesla. The 98.5% cold-rolled alloys that were annealed at 1250 °C for 0.5 h presented a strong <100> texture in the rolling direction with an average grain size of 360 μm. Increasing the annealing time to 1 h, the intensity of texture reduced from 31.61 to 23.19. The fraction of low angle grain boundaries (LABs) for the 98.5% CR samples after annealing at 1250 °C for 0.5 h and 1 h was about 24.6% and 16.1%, respectively. Three-point-bending results show that the sample aged at 700 °C for 6 h displayed 0.2% recoverable strain at a stress level of 800 MPa. Failure occurred before the 900 MPa cycle could be completed. The sample aged at 700 °C for 12 h shows no transformation before the applied stress level of 300 MPa. As the stress levels increase to 400 MPa, the sample shows the shape memory effect and displayed 0.8% recoverable strain at a stress level of 400 MPa. The samples are failures during the 500 MPa cycle. The observed recoverable strain values were lower than those that were theoretically predicted, which was possibly due to the larger volume fraction of high-angle grain boundary and the slightly lower than expected average grain size.

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15

Chen, Zeyu. "Application of SMA materials in aerospace." Applied and Computational Engineering 25, no. 5 (November 30, 2023): 22–29. http://dx.doi.org/10.54254/2755-2721/25/ojs/20230728.

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The various characteristics of shape memory alloys, such as hyperelasticity, memory alloy effect and so on, make shape memory alloys become a new type of material with broad engineering applications. These components developed based on the characteristics of shape memory alloys are not only used in the aerospace field, but also in various fields such as bridges and railways, and can be used for various purposes such as bridge vibration control and intelligent hybrid control. This article mainly introduces several characteristics of shape memory alloys, and explains the practical application and development prospects of shape memory alloys in the aerospace field. Based on these studies, this article studies the characteristics of shape memory alloys through equation calculus and ANSYS simulation experiments modeling. It can be foreseen in the future that with the development of intelligent control technology, shape memory alloy structures will have a larger operating temperature range, more precise structural control, and will be applied in a wider variety of spacecraft structures.

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Chen, Zeyu. "Application of SMA materials in aerospace." Applied and Computational Engineering 25, no. 1 (November 7, 2023): 22–29. http://dx.doi.org/10.54254/2755-2721/25/20230728.

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The various characteristics of shape memory alloys, such as hyperelasticity, memory alloy effect and so on, make shape memory alloys become a new type of material with broad engineering applications. These components developed based on the characteristics of shape memory alloys are not only used in the aerospace field, but also in various fields such as bridges and railways, and can be used for various purposes such as bridge vibration control and intelligent hybrid control. This article mainly introduces several characteristics of shape memory alloys, and explains the practical application and development prospects of shape memory alloys in the aerospace field. Based on these studies, this article studies the characteristics of shape memory alloys through equation calculus and ANSYS simulation experiments modeling. It can be foreseen in the future that with the development of intelligent control technology, shape memory alloy structures will have a larger operating temperature range, more precise structural control, and will be applied in a wider variety of spacecraft structures.

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17

Hong, Sung-Hwan, Hae-Jin Park, Gi-An Song, and Ki-Buem Kim. "Recent Developments in Ultrafine Shape Memory Alloys Using Amorphous Precursors." Materials 16, no. 23 (November 24, 2023): 7327. http://dx.doi.org/10.3390/ma16237327.

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In this review, we systematically reviewed the recent advances in the development of ultrafine shape memory alloys with unique shape memory effects and superelastic behavior using amorphous metallic materials. Its scientific contribution involves defining and expanding the range of fabrication methods for single-phase ultrafine/nanocrystalline alloys with multicomponent systems. In multicomponent amorphous alloys, the crystallization mechanism depends on the alloy composition and is a selectable factor in the alloy designing method, considering the thermodynamic and physical parameters of constituent elements. The crystallization kinetics can be controlled by modulating the annealing condition in a supercooled liquid state with consideration of the crystalline temperature of the amorphous alloys. The phase stability of austenite and martensite phases in ultrafine shape memory alloys developed from amorphous precursors is determined according to alloy composition and grain size, which strongly influence the shape memory effect and superelastic behavior. A methodological framework is subsequently suggested to develop the ultrafine shape memory alloys based on the systematic alloy designing method, which can be considered an important strategy for developing novel ultrafine/nanocrystalline shape memory alloys with excellent shape memory and superelastic effects.

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18

Achitei, Dragos Cristian, Mohd Mustafa Al Bakri Abdullah, Andrei Victor Sandhu, Petrică Vizureanu, and Alida Abdullah. "On the Fatigue of Shape Memory Alloys." Key Engineering Materials 594-595 (December 2013): 133–39. http://dx.doi.org/10.4028/www.scientific.net/kem.594-595.133.

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When we use effectively shape memory alloys require knowledge of operational behavior at the thermal stresses and mechanical variables. Measurements performed on a CuZnAl alloy, revealed fatigue properties by considering the size of the maximum load deformation corresponding recovered memory. It requires knowledge in design fatigue behavior of shape memory alloy components after education, fatigue strength by performing partial memory loss or physical destruction. The properties of memory shape alloys recommend their use for complex mechanical applications in domains as follows medicine, robotics, aeronautics, electric contacts, actuators. Shape memory metal alloys in the construction of such installations are subject to mechanical stress, and the thermal stresses, so their inclusion in a computing system fatigue involves consideration of the function performed.

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19

Vignoli, Lucas L., Marcelo A. Savi, and Sami El-Borgi. "Nonlinear dynamics of earthquake-resistant structures using shape memory alloy composites." Journal of Intelligent Material Systems and Structures 31, no. 5 (January 13, 2020): 771–87. http://dx.doi.org/10.1177/1045389x19898269.

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Earthquake-resistant structures have been widely investigated in order to produce safe buildings designed to resist seismic activities. The remarkable properties of shape memory alloys, especially pseudoelastic effect, can be exploited in order to promote the essential energy dissipation necessary for earthquake-resistant structures. In this regard, shape memory alloy composite is an idea that can make this application feasible, using shape memory alloy fibers embedded in a matrix. This article investigates the use of shape memory alloy composites in a one-story frame structure subjected to earthquakes. Different kinds of composites are analyzed, comparing the influence of matrix type. Both linear elastic matrix and elastoplastic matrix with isotropic and kinematic hardening are investigated. Results indicate the great energy dissipation capability of shape memory alloy composites. A parametric analysis allows one to conclude that the maximum shape memory alloy volume fraction is not the optimum design condition for none of the cases studied, highlighting the necessity of a proper composite design. Despite the elastoplastic behavior of matrix also dissipates a considerable amount of energy, the associated residual strains are not desirable, showing the advantage of the use of shape memory alloys.

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20

Abu Al Timan, Jamal A., Iman M. Al Zaka, and Baidaa M. Zeidan. "Hyflex CM and EDM from Shape Memory to Control Memory." Erbil Dental Journal 6, no. 2 (December 30, 2023): 171–74. http://dx.doi.org/10.15218/edj.2023.18.

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The new era in endodontics has been established with the introduction of nickel titanium (NiTi) alloys, and later on the automation of mechanical preparation. By changing the phase transformation temperatures of NiTi alloy, the manufacturers alter the phase composition to have a NiTi with new mechanical properties. These mechanical properties can be achieved either by thermal, mechanical treatments or both. Moreover, many machining procedures (e.g. twisting, electrical discharge machining), were developed. The higher flexibility of thermomechanically treated NiTi alloys was found as the main advantages of these alloys with the improvement of cyclic fatigue resistance when compared to conventional NiTi. Austenitic alloys have superelastic properties due to stress-induced martensite transformation and consequently try to springback to their original shape after distortion. In contrast, the martensitic instruments have ability to reorientation of martensite variants when heated. So these instruments easily deformed and show a shape memory effect. Moreover, the use of martensitic alloy results in more flexible files, with an increased cyclic fatigue resistance compared with austenitic alloy. So, continued development in the manufacturing treatment of NiTi alloys has resulted in the producing of controlled memory (CM) wire. These materials do not possess superelastic properties at neither room nor body temperature. This article reviews the development process, features and properties of Hyflex file and Hyflex EDM file made from CM wire. Keywords: NiTi alloy, CM wire, Hyflex EDM, Heat treated NiTi

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21

Miyazaki, Shuichi, and Kazuhiro Otsuka. "Development of shape memory alloys." ISIJ International 29, no. 5 (1989): 353–77. http://dx.doi.org/10.2355/isijinternational.29.353.

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22

Tuissi, Ausonio, Paola Bassani, and Carlo Alberto Biffi. "CuZnAl Shape Memory Alloys Foams." Advances in Science and Technology 78 (September 2012): 31–39. http://dx.doi.org/10.4028/www.scientific.net/ast.78.31.

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Foams and other highly porous metallic materials with cellular structures are known to have many interesting combinations of physical and mechanical properties. That makes these systems very attractive for both structural and functional applications. Cellular metals can be produced by several methods including liquid infiltration of leachable space holders. In this contribution, results on metal foams of Cu based shape memory alloys (SMAs) processed by molten metal infiltration of SiO2 particles are presented. By using this route, highly homogeneous CuZnAl SMA foams with a spherical open-cell morphologies have been manufactured and tested. Morphological, thermo-mechanical and cycling results are reported.

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23

Karami, M., and X. Chen. "Nanomechanics of shape memory alloys." Materials Today Advances 10 (June 2021): 100141. http://dx.doi.org/10.1016/j.mtadv.2021.100141.

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24

MIYAZAKI, Shuichi. "Fatigue of shape memory alloys." Journal of the Society of Materials Science, Japan 39, no. 445 (1990): 1329–39. http://dx.doi.org/10.2472/jsms.39.1329.

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25

Philippe, Jean-Marc. "Art and Shape-Memory Alloys." Leonardo 22, no. 1 (1989): 117. http://dx.doi.org/10.2307/1575150.

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26

Karaca, H. E., E. Acar, H. Tobe, and S. M. Saghaian. "NiTiHf-based shape memory alloys." Materials Science and Technology 30, no. 13 (July 9, 2014): 1530–44. http://dx.doi.org/10.1179/1743284714y.0000000598.

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27

Kibirkštis, E., R. Liaudinskas, D. Pauliukaitis, and K. Vaitasius. "Mechanisms with Shape Memory Alloys." Le Journal de Physique IV 07, no. C5 (November 1997): C5–633—C5–636. http://dx.doi.org/10.1051/jp4:19975100.

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28

Ma, J., I. Karaman, and R. D. Noebe. "High temperature shape memory alloys." International Materials Reviews 55, no. 5 (September 2010): 257–315. http://dx.doi.org/10.1179/095066010x12646898728363.

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29

Stern, R. A., S. D. Willoughby, J. M. MacLaren, J. Cui, Q. Pan, and R. D. James. "Fe3Pd ferromagnetic shape memory alloys." Journal of Applied Physics 93, no. 10 (May 15, 2003): 8644–46. http://dx.doi.org/10.1063/1.1543872.

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30

Firstov, G. S., T. A. Kosorukova, Yu N. Koval, and V. V. Odnosum. "High Entropy Shape Memory Alloys." Materials Today: Proceedings 2 (2015): S499—S503. http://dx.doi.org/10.1016/j.matpr.2015.07.335.

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31

Ortı́n, Jordi, and Lucas Delaey. "Hysteresis in shape-memory alloys." International Journal of Non-Linear Mechanics 37, no. 8 (December 2002): 1275–81. http://dx.doi.org/10.1016/s0020-7462(02)00027-6.

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32

Vassiliev, Alexandre. "Magnetically driven shape memory alloys." Journal of Magnetism and Magnetic Materials 242-245 (April 2002): 66–67. http://dx.doi.org/10.1016/s0304-8853(01)01192-1.

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33

Firstov, G. S., J. Van Humbeeck, and Y. N. Koval. "High-temperature shape memory alloys." Materials Science and Engineering: A 378, no. 1-2 (July 2004): 2–10. http://dx.doi.org/10.1016/j.msea.2003.10.324.

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34

Enkovaara, J., A. Ayuela, A. T. Zayak, P. Entel, L. Nordström, M. Dube, J. Jalkanen, J. Impola, and R. M. Nieminen. "Magnetically driven shape memory alloys." Materials Science and Engineering: A 378, no. 1-2 (July 2004): 52–60. http://dx.doi.org/10.1016/j.msea.2003.10.330.

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35

Uchil, Jayagopal. "Shape memory alloys — characterization techniques." Pramana 58, no. 5-6 (May 2002): 1131–39. http://dx.doi.org/10.1007/s12043-002-0229-7.

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36

Frémond, Michel, Michele Marino, and Elisabetta Rocca. "Collisions in shape memory alloys." GAMM-Mitteilungen 40, no. 3 (March 2018): 157–83. http://dx.doi.org/10.1002/gamm.201730002.

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37

Ortega, A. M., J. Tyber, C. P. Frick, K. Gall, and H. J. Maier. "Cast NiTi Shape-Memory Alloys." Advanced Engineering Materials 7, no. 6 (June 2005): 492–507. http://dx.doi.org/10.1002/adem.200400173.

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38

Fähler, S. "Why Magnetic Shape Memory Alloys?" Advanced Engineering Materials 14, no. 8 (June 20, 2012): 521–22. http://dx.doi.org/10.1002/adem.201200167.

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39

Adiguzel, Osman. "Phase Transitions and Elementary Processes in Shape Memory Alloys." Advanced Materials Research 1101 (April 2015): 124–28. http://dx.doi.org/10.4028/www.scientific.net/amr.1101.124.

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Shape memory effect is a peculiar property exhibited by certain alloy systems, and shape memory alloys are recognized to be smart materials. These alloys have important ability to recover the original shape of material after deformation, and they are used as shape memory elements in devices due to this property. The shape memory effect is facilitated by a displacive transformation known as martensitic transformation. Shape memory effect refers to the shape recovery of materials resulting from martensite to austenite transformation when heated above reverse transformation temperature after deforming in the martensitic phase. These alloys also cycle between two certain shapes with changing temperature.Martensitic transformations occur with cooperative movement of atoms by means of lattice invariant shears on a {110} - type plane of austenite matrix which is basal plane of martensite.Copper based alloys exhibit this property in metastable β-phase field. High temperature β-phase bcc-structures martensiticaly undergo the non-conventional structures following two ordered reactions on cooling, and structural changes in nanoscale level govern this transition cooling. Atomic movements are also confined to interatomic lengths due to the diffusionless character of martensitic transformation.

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Araújo Mota, C. A., A. S. Cavalcanti Leal, C. J. Araújo, A. G. Barbosa de Lima, and K. B. Moura da Silva. "Thermal Behaviour of Polymer Composite Reinforced with NiTi Shape Memory Alloys." Diffusion Foundations 10 (June 2017): 39–54. http://dx.doi.org/10.4028/www.scientific.net/df.10.39.

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Shape memory alloys (SMA) are materials with metallic characteristic able to recover a geometric shape previously established under heat effect. This differentiated property, combined with the mechanical characteristic allows its use in many industrial situations. Active composites are produced with the polymeric matrix and wire of shape memory alloy, combining the elastic properties of the composite and characteristics of the phase transformation, martensite and austenite of SMA with memory alloy effect. The phase transformations that occur in the alloy are thermal processes, characterized by an increase in temperature during processing. The heat is transmitted for matrix, resulting in loss of mechanical properties of the composite. In this context, this paper aims to numerically analyze heat transfer in an epoxy resin polymer matrix incorporating Ni-Ti alloy wire with shape memory effect using ANSYS CFX software.

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41

Acitei, Dragos Cristian, Andrei Victor Sandhu, Mohd Mustafa Al Bakri Abdullah, Petrică Vizureanu, and Alida Abdullah. "On the Structure of Shape Memory Alloys." Key Engineering Materials 594-595 (December 2013): 140–45. http://dx.doi.org/10.4028/www.scientific.net/kem.594-595.140.

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The paper presents the obtaining of shape memory alloys, base copper and a diffractometer and microscopic study on some samples. The study was made on CuZnAl samples, obtained by classic casting and educated. The shape memory alloys properties recommend their use for applications in domains as follows electric contacts, robotics, and aeronautics. When choosing the type of alloy used for the manufacture of the component parts of different industrial applications, it must be taken into account fatigue resistance, resistance to shocks and resistance to corrosion. Shape memory alloys are a unique group of alloys with the ability to remember a form even after quite severe plastic deformations. At low temperatures, shape memory alloys can be deformed apparently like other metallic alloys, but this deformation can recover with a relatively modest increase in temperature.

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42

Saghaian, S. M., H. E. Karaca, M. Souri, A. S. Turabi, and R. D. Noebe. "Tensile shape memory behavior of Ni50.3Ti29.7Hf20 high temperature shape memory alloys." Materials & Design 101 (July 2016): 340–45. http://dx.doi.org/10.1016/j.matdes.2016.03.163.

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43

HOSODA, Hideki, Toshiyuki KAWAMURA, Tomonari INAMURA, Kenji WAKASHIMA, and Shuichi MIYAZAKI. "209 Shape Memory Properties of TiAu High Temperature Shape Memory Alloys." Proceedings of the 1992 Annual Meeting of JSME/MMD 2006 (2006): 75–76. http://dx.doi.org/10.1299/jsmezairiki.2006.0_75.

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44

Zhang, Jiang, Yong-hong Ma, Ruo-lin Wu, and Jing-min Wang. "Shape memory effect of dual-phase NiMnGaTb ferromagnetic shape memory alloys." Journal of Iron and Steel Research International 26, no. 3 (November 2, 2018): 321–28. http://dx.doi.org/10.1007/s42243-018-0144-x.

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45

Petrini, Lorenza, and Francesco Migliavacca. "Biomedical Applications of Shape Memory Alloys." Journal of Metallurgy 2011 (May 23, 2011): 1–15. http://dx.doi.org/10.1155/2011/501483.

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Shape memory alloys, and in particular NiTi alloys, are characterized by two unique behaviors, thermally or mechanically activated: the shape memory effect and pseudo-elastic effect. These behaviors, due to the peculiar crystallographic structure of the alloys, assure the recovery of the original shape even after large deformations and the maintenance of a constant applied force in correspondence of significant displacements. These properties, joined with good corrosion and bending resistance, biological and magnetic resonance compatibility, explain the large diffusion, in the last 20 years, of SMA in the production of biomedical devices, in particular for mini-invasive techniques. In this paper a detailed review of the main applications of NiTi alloys in dental, orthopedics, vascular, neurological, and surgical fields is presented. In particular for each device the main characteristics and the advantages of using SMA are discussed. Moreover, the paper underlines the opportunities and the room for new ideas able to enlarge the range of SMA applications. However, it is fundamental to remember that the complexity of the material and application requires a strict collaboration between clinicians, engineers, physicists and chemists for defining accurately the problem, finding the best solution in terms of device design and accordingly optimizing the NiTi alloy properties.

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Liu, Bingfei, Qingfei Wang, Kai Yin, and Liwen Wang. "An analytical model for crack monitoring of the shape memory alloy intelligent concrete." Journal of Intelligent Material Systems and Structures 31, no. 1 (October 16, 2019): 100–116. http://dx.doi.org/10.1177/1045389x19880010.

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A theoretical model for the crack monitoring of the shape memory alloy intelligent concrete is presented in this work. The mechanical properties of shape memory alloy materials are first given by the experimental test. The one-dimensional constitutive model of the shape memory alloys is reviewed by degenerating from a three-dimensional model, and the behaviors of the shape memory alloys under different working conditions are then discussed. By combining the electrical resistivity model and the one-dimensional shape memory alloy constitutive model, the crack monitoring model of the shape memory alloy intelligent concrete is given, and the relationships between the crack width of the concrete and the electrical resistance variation of the shape memory alloy materials for different crack monitoring processes of shape memory alloy intelligent concrete are finally presented. The numerical results of the present model are compared with the published experimental data to verify the correctness of the model.

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Jähne, R., and L. F. Campanile. "Shape-memory coaxial bimorphs." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 223, no. 11 (August 25, 2009): 2713–16. http://dx.doi.org/10.1243/09544062jmes1779.

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The thermal shape recovery shown by shape memory alloys is a property that makes these materials very attractive for applications in the field of smart structures, e.g. bending actuators. This article shows a design method for coaxial bimorphs that are composed of a linear-elastic and shape memory alloy component, properly coupled. A simple and effective method is proposed to solve for the component designs in order to achieve given bimorph configurations. Analytical examples and finite-element simulations are shown for the case of assigned bimorph's warm shape.

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Tang, Cheng, Wei Min Huang, and Chang Chun Wang. "From Dual-Shape/Temperature Memory Effect to Triple-Shape Memory Effect in NiTi Shape Memory Alloys." Advances in Science and Technology 78 (September 2012): 1–6. http://dx.doi.org/10.4028/www.scientific.net/ast.78.1.

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Triple-shape memory effect (SME), i.e., to recover the original shape through one intermediate shape upon heating, has been demonstrated as an intrinsic feature of thermo-responsive shape memory polymers (SMPs) after being uniformly programmed, but seemingly has yet been achieved in shape memory alloys (SMAs). In this paper, we study two programming approaches, in which the deformation is uniform throughout the whole sample length without involving any permanent change in material properties at all, to realize the triple-SME in NiTi SMAs. We show that the triple-SME can be tailored to meet the temperature/strain requirements. With this technique, now we are able to achieve step-by-step motion control in SMAs.

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Gil, F. J., and J. A. Planell. "Shape memory alloys for medical applications." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 212, no. 6 (June 1, 1998): 473–88. http://dx.doi.org/10.1243/0954411981534231.

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The shape memory alloys exhibit a number of remarkable properties, which open new possibilities in engineering and more specifically in biomedical engineering. The most important alloy used in biomedical applications is NiTi. This alloy combines the characeristics of the shape memory effect and superelasticity with excellent corrosion resistance, wear characteristics, mechanical properties and a good biocompatibility. These properties make it an ideal biological engineering material, especially in orthopaedic surgery and orthodontics. In this work the basis of the memory effect lies in the fact that the materials exhibiting such a property undergo a thermoelastic martensitic transformation. In order to understand even the most elementary engineering aspects of the shape memory effect it is necessary to review some basic principles of the formation and the characteristics of the martensitic phase. The different properties of shape memory, superelasticity, two-way shape memory, rubber-like behaviour and a high damping capacity are reviewed. Some applications proposed in recent years are described and classified according to different medical fields.

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Niu, Haojie, Yubin Sun, and Chengxin Lin. "Study on the Effect of Solid Solution Treatment on the Bending Fatigue Property of Fe-Mn-Si Shape Memory Alloys." Metals 14, no. 4 (April 10, 2024): 441. http://dx.doi.org/10.3390/met14040441.

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Fe-Mn-Si shape memory alloys have excellent low-cycle fatigue performance and broad application prospects in the field of civil engineering and construction. It is necessary to conduct comprehensive and in-depth research on the mechanical properties of Fe-Mn-Si shape memory alloys. This study takes the Fe17Mn5Si10Cr5Ni shape memory alloy as the research object. After solid solution treatment at different temperatures and times, the effect of solid solution treatment on the bending fatigue performance of Fe-Mn-Si shape memory alloys was studied using bending cycle tests. The phase composition and fracture morphology of the sample were analyzed. The results showed that solid solution treatment can significantly improve the bending fatigue performance of Fe-Mn-Si shape memory alloys, reaching the optimal value at 850 °C for 1 h. The number of bending cycles until fracture increased by 131% compared to untreated specimens. Stress induction γ → ε martensitic transformation occurred in Fe-Mn-Si shape memory alloy specimens during bending cyclic testing, which is reversible. The fracture area of Fe-Mn-Si shape memory alloy specimens is mainly characterized by ductile fracture, with some areas exhibiting quasi-quasi-cleavage fracture characteristics.

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