Special Issue "Materials with Shape Memory: Phase Transformations, Microstructure and Properties"

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: 31 December 2019.

Special Issue Editor

Guest Editor
Prof. Lotkov Aleksandr Ivanovich Website E-Mail
Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences
Interests: shape memory alloys, microstructure, properties

Special Issue Information

Dear Colleagues,

Materials with shape memory and superelasticity effects on metal and polymer base are interesting objects for solving fundamental problems of condensed matter physics, as well as for applied research and development. The possibility of the return of large deformations, which were pre-set to materials with shape memory, is due to reversible changes in the crystal or molecular structure of the materials. In metal materials, these effects are most often due to thermoelastic martensitic transformation, which was discovered in 1948 by the outstanding Russian scientist academician G. V. Kurdyumov. Currently, materials with shape memory are used in medicine as implants for the treatment of socially significant diseases and in the aerospace engineering and automotive industries; they also have great potential in micro-robotics. This Special Issue is devoted to both fundamental studies of nature and mechanisms of shape memory effects realization in materials, and the applied development and application of these materials. This issue of the journal aims to cover the topic of materials with shape memory as much as possible, and will include both articles presenting new original results and reviews of recent research and specific applications. Manuscripts will be welcomed from researchers working in higher education and research institutions, as well as industrial companies that develop and produce products using materials with shape memory.

Prof. Lotkov Aleksandr Ivanovich
Guest Editor

Manuscript Submission Information

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Keywords

  • shape memory materials
  • microstructure
  • fundamental properties
  • developments

Published Papers (3 papers)

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Research

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Open AccessArticle
Crystallization Features of Amorphous Rapidly Quenched High Cu Content TiNiCu Alloys upon Severe Plastic Deformation
Materials 2019, 12(17), 2670; https://doi.org/10.3390/ma12172670 - 22 Aug 2019
Abstract
In recent years, the methods of severe plastic deformation and rapid melt quenching have proven to be an effective tool for the formation of the unique properties of materials. The effect of high-pressure torsion (HPT) on the structure of the amorphous alloys of [...] Read more.
In recent years, the methods of severe plastic deformation and rapid melt quenching have proven to be an effective tool for the formation of the unique properties of materials. The effect of high-pressure torsion (HPT) on the structure of the amorphous alloys of the quasi-binary TiNi–TiCu system with a copper content of more than 30 at.% produced by melt spinning technique has been analyzed using the methods of scanning electron microscopy, X-ray diffraction analysis, and differential scanning calorimetry (DSC). The structure examinations have shown that the HPT of the alloys with a Cu content ranging from 30 to 40 at.% leads to nanocrystallization from the amorphous state. An increase in the degree of deformation leads to a substantial change in the character of the crystallization reflected by the DSC curves of the alloys under study. The alloys containing less than 34 at.% Cu exhibit crystallization peak splitting, whereas the alloys containing more than 34 at.% Cu exhibit a third peak at lower temperatures. The latter effect suggests the formation of regions of possible low-temperature crystallization. It has been established that the HPT causes a significant decrease in the thermal effect of crystallization upon heating of the alloys with a high copper content relative to that of the initial amorphous melt quenched state. Full article
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Open AccessArticle
The Electrochemical and Mechanical Behavior of Bulk and Porous Superelastic Ti‒Zr-Based Alloys for Biomedical Applications
Materials 2019, 12(15), 2395; https://doi.org/10.3390/ma12152395 - 27 Jul 2019
Abstract
Titanium alloys are well recognized as appropriate materials for biomedical implants. These devices are designed to operate in quite aggressive human body media, so it is important to study the corrosion and electrochemical behavior of the novel materials alongside the underlying chemical and [...] Read more.
Titanium alloys are well recognized as appropriate materials for biomedical implants. These devices are designed to operate in quite aggressive human body media, so it is important to study the corrosion and electrochemical behavior of the novel materials alongside the underlying chemical and structural features. In the present study, the prospective Ti‒Zr-based superelastic alloys (Ti-18Zr-14Nb, Ti-18Zr-15Nb, Ti-18Zr-13Nb-1Ta, atom %) were analyzed in terms of their phase composition, functional mechanical properties, the composition and structure of surface oxide films, and the corresponding corrosion and electrochemical behavior in Hanks’ simulated biological solution. The electrochemical parameters of the Ti-18Zr-14Nb material in bulk and foam states were also compared. The results show a significant difference in the functional performance of the studied materials, with different composition and structure states. In particular, the positive effect of the thermomechanical treatment regime, leading to the formation of a favorable microstructure on the corrosion resistance, has been revealed. In general, the Ti-18Zr-15Nb alloy exhibits the optimum combination of functional characteristics in Hanks’ solution, while the Ti-18Zr-13Nb-1Ta alloy shows the highest resistance to the corrosion environment. The Ti-18Zr-14Nb-based foam material exhibits slightly lower passivation kinetics as compared to its bulk equivalent. Full article
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Review

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Open AccessFeature PaperReview
Design and Development of Ti–Ni, Ni–Mn–Ga and Cu–Al–Ni-based Alloys with High and Low Temperature Shape Memory Effects
Materials 2019, 12(16), 2616; https://doi.org/10.3390/ma12162616 - 16 Aug 2019
Abstract
In recent years, multicomponent alloys with shape memory effects (SMEs), based on the ordered intermetallic compounds B2–TiNi, L21–Ni2MnGa, B2– and D03–Cu–Me (Me = Al, Ni, Zn), which represent a special important class of intelligent materials, have been [...] Read more.
In recent years, multicomponent alloys with shape memory effects (SMEs), based on the ordered intermetallic compounds B2–TiNi, L21–Ni2MnGa, B2– and D03–Cu–Me (Me = Al, Ni, Zn), which represent a special important class of intelligent materials, have been of great interest. However, only a small number of known alloys with SMEs were found to have thermoelastic martensitic transformations (TMTs) at high temperatures. It is also found that most of the materials with TMTs and related SMEs do not have the necessary ductility and this is currently one of the main restrictions of their wide practical application. The aim of the present work is to design and develop multicomponent alloys with TMTs together with ways to improve their strength and ductile properties, using doping and advanced methods of thermal and thermomechanical treatments. The structure, phase composition, and TMTs were investigated by transmission- and scanning electron microscopy, as well as by neutron-, electron- and X-ray diffraction. Temperature measurements of the electrical resistance, magnetic susceptibility, as well as tests of the tensile mechanical properties and special characteristics of SMEs were also used. Temperature–concentration dependences for TMTs in the binary and ternary alloys of a number of quasi-binary systems were determined and discussed. It is shown that the ductility and strength of alloys required for the realization of SMEs can be achieved through optimal alloying, which excludes decomposition in the temperature range of SMEs’ usage, as well as via various treatments that ensure the formation of their fine- (FG) and ultra-fine-grained (UFG) structure. Full article
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