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Technology and Applications of Shape Memory Materials
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Technology and Applications of Shape Memory Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Smart Materials".

Deadline for manuscript submissions: 20 November 2024 | Viewed by 2415

Special Issue Editors

Dr. Xiaobin Shi

E-Mail Website
Guest Editor
Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Maanshan 243032, China
Interests: martensitic transformation; NiTi alloys; hyperelasticity; phenomenological theory; alloys design; microstructure; nanocrystalline; size effects
Dr. Yang Shao

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China
Interests: martensitic transformation; titianium alloys; alloys design; NiTi alloys; NiTi based composites
Dr. Jiang Jiang

E-Mail Website
Guest Editor
Jiangxi Key Laboratory of Advanced Copper and Tungsten Materials, Jiangxi Academy of Sciences, Nanchang 330029, China
Interests: martensitic transformation; NiTi alloys; hyperelasticity; NiTi based composites; alloys design
Dr. Qingkun Meng

E-Mail Website
Guest Editor
School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, China
Interests: Ti alloys; TiNb shape memory alloys; martensitic transformation; alloys design

Special Issue Information

Dear Colleagues,

Shape memory alloys (SMAs), as functional materials, are widely used in fields such as aerospace, civil engineering, and biomedical engineering. SMAs have functional properties such as the shape memory effect and superelasticity. SMAs are mainly be NiTi-based, iron-based, copper-based, magnesium-based, etc. NiTi-based SMAs are the most common. NiTi alloys are commonly used as orthodontic wires, vascular stents, esophageal stents, tube connectors, etc.

The properties of SMAs include phase transformation temperatures, hysteresis, plateau stress, recoverable strain, recovery stress, etc. The performance of SMAs is closely related to their composition and microstructure. The performance of shape memory alloys is sensitive to their composition, and changes in composition can greatly alter the phase transformation temperatures of the alloys, thereby altering their performance. The influence of microstructure includes factors such as grain size, dislocations, and precipitation.

The aim of this Special Issue is to understand the relationship between the performance and microstructure of SMAs, explore technical methods to improve the performance of SMAs, prospect the application prospects of nanocrystalline SMAs, and pay special attention to the performance and influencing factors of nanocrystalline SMAs.

Dr. Xiaobin Shi
Dr. Yang Shao
Dr. Jiang Jiang
Dr. Qingkun Meng
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • shape memory alloys
  • martensitic transformation
  • nanocrystalline alloys
  • pseudoelasticity
  • microstructures

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Published Papers (3 papers)

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Research

13 pages, 5692 KiB  
Article
Experimental Investigation of the Impact of Loading Conditions on the Change in Thin NiTi Wire Resistance during Cyclic Stretching
by Jonasz Hartwich, Sławomir Duda, Sebastian Sławski, Marek Kciuk, Anna Woźniak and Grzegorz Gembalczyk
Materials 2024, 17(18), 4577; https://doi.org/10.3390/ma17184577 - 18 Sep 2024
Viewed by 537
Abstract
This paper presents the results of an experimental study designed to evaluate the effect of repeated stretching cycles on the electrical resistance change in a NiTi alloy wire. In particular, tests were carried out to determine the effect of the type of loading [...] Read more.
This paper presents the results of an experimental study designed to evaluate the effect of repeated stretching cycles on the electrical resistance change in a NiTi alloy wire. In particular, tests were carried out to determine the effect of the type of loading on resistance change in the investigated wires. Wires with a diameter of 100 μm were used in the research. The experiment was carried out on a dedicated test stand designed for this purpose. During the test, the samples were subjected to 40 identical tensile cycles. The electrical resistance, sample elongation, and tensile force during successive stretching cycles were measured. The conducted research demonstrated the impact of elongation and reorientation of the structure on the resistance change in NiTi alloy thin wires. The research included a comparison of the effect of two different types of loading on the electrical resistance change in the sample. During cyclic stretching of a NiTi alloy sample with constant displacement, a decrease in electrical resistance was observed after each successive stretching cycle. Alternatively, when stretching with a constant force, the value of electrical resistance increased. In both types of loads, the greatest change in resistance value was observed at the initial cycles. Full article
(This article belongs to the Special Issue Technology and Applications of Shape Memory Materials)
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25 pages, 14064 KiB  
Article
A Novel Technique for Improving Cyclic Behavior of Steel Connections Equipped with Smart Memory Alloys
by Ali S. Alqarni, Mohammad J. Alshannag and Mahmoud M. Higazey
Materials 2024, 17(13), 3226; https://doi.org/10.3390/ma17133226 - 1 Jul 2024
Viewed by 736
Abstract
Residual drifts are an important measure of post-earthquake functionality in bridges and buildings, and can determine whether the structure remains fit for its intended purpose or not. This study aims at investigating numerically, through finite element (FE) analysis in ABAQUS, the cyclic response [...] Read more.
Residual drifts are an important measure of post-earthquake functionality in bridges and buildings, and can determine whether the structure remains fit for its intended purpose or not. This study aims at investigating numerically, through finite element (FE) analysis in ABAQUS, the cyclic response of exterior steel I beam-hollow column connection using welded shape memory alloys (SMA) bolts and seat angles. This is followed by validating the numerical model using an accredited experimental data available in the literature through different techniques, (1) SMA bolts, (2) SMA angles, (3) SMA bolts and angles. The parameters investigated included: SMA type, SMA angle thickness, SMA bolt diameter, SMA angle stiffener and SMA angle direction. The cyclic performance of the steel connection was enhanced further by varying the bolt diameter, plate thickness, angle type and direction. The results revealed that the connections equipped with a combination of SMA plates and SMA angles reduced the residual drift by up to 94%, and doubled the self-centering capability compared to conventional steel connections. Moreover, the parametric analysis showed that Fe-based SMA members could be a good alternative to NiTi based SMA members for improving the self-centering capability and reducing the residual drifts of conventional steel connections. Full article
(This article belongs to the Special Issue Technology and Applications of Shape Memory Materials)
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18 pages, 2861 KiB  
Article
Regularities in the Evolution of Thermoelastic Martensitic Transformations during Cooling/Heating in the Free State and under Load of Titanium Nickelide Alloyed with Niobium
by Ekaterina S. Marchenko, Anatoly A. Klopotov, Gulsharat A. Baigonakova and Ilya A. Zhukov
Materials 2024, 17(1), 175; https://doi.org/10.3390/ma17010175 - 28 Dec 2023
Viewed by 764
Abstract
This article presents the results of studies of the features of the development of thermoelastic martensitic transformations during cooling/heating in the free state and under load of Ti50Ni49.7−XNbXMo0.3 alloys (X = 0.5, 1.0 and 1.5 at% [...] Read more.
This article presents the results of studies of the features of the development of thermoelastic martensitic transformations during cooling/heating in the free state and under load of Ti50Ni49.7−XNbXMo0.3 alloys (X = 0.5, 1.0 and 1.5 at% Nb) with shape memory effects. Using X-ray diffraction analysis, it was found that all the alloys studied at room temperature contained a multiphase mixture consisting of intermetallic compounds with the TiNi (B2, B19′), Ni56Ti29Nb15, and Ti2Ni compositions. Scanning electron microscopy was used to study the microstructure of TiNi (Nb,Mo) alloys and it was found that the distribution of fine Ni56Ti29Nb15 particles in the matrix depends significantly on the concentration of the alloying element. A correlation was established between changes in the structural-phase state in TiNi (Nb,Mo) alloys and the occurrence of the B2↔B19′ martensitic transition in the free state and under load. Based on physical and mechanical studies, the temperature ranges of the martensitic transformations (MT) in the free state and under load were established. Based on the thermodynamic description of the MT and the analysis of the characteristic temperatures of the MT, it was found that the MT mechanism is strongly dependent on the concentration of the alloying element. Full article
(This article belongs to the Special Issue Technology and Applications of Shape Memory Materials)
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