Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
4.4
2.9
Journals
Metals
Special Issues
Novel Shape Memory Alloys
share announcement

Novel Shape Memory Alloys

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Entropic Alloys and Meta-Metals".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 11532

Special Issue Editor

Prof. Dr. Daoyong Cong

E-Mail Website
Guest Editor
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
Interests: phase transformation; shape memory alloys; solid-state caloric materials

Special Issue Information

Dear Colleagues,

Research interest in shape memory alloys has been increasing continuously. Recently, significant research progress has been made in the field of novel shape memory alloys, covering a broad range of research topics, including the improvement of functional properties and understanding of basic mechanisms of shape memory alloys, high-temperature shape memory alloys for aerospace and automotive applications, elastocaloric shape memory alloys for solid-state refrigeration, magnetic shape memory alloys, and shape memory alloys for biomedical applications. High-entropy shape memory alloys also represent an emerging field, and the additive manufacturing of shape memory alloys is attracting increasing attention.

The goal of this Special Issue is to provide an opportunity for scientists and researchers to present their recent research results on or insights into novel shape memory alloys. Both original and review articles are welcome.

Topics of interest include but are not limited to:

  • Advanced shape memory alloys
  • Shape memory alloys for caloric refrigeration
  • High-temperature shape memory alloys
  • Magnetic shape memory alloys
  • High-entropy shape memory alloys
  • Low-dimensional shape memory alloys
  • Shape memory alloys for biomedical applications
  • Additive manufacturing of shape memory alloys
  • Strain glass
  • Novel functional properties and new phenomena

Prof. Dr. Daoyong Cong
Guest Editor

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. Metals is an international peer-reviewed open access monthly 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
  • Elastocaloric effect
  • Shape memory effect
  • Superelasticity
  • Additive manufacturing
  • Strain glass
  • Intelligent materials

Published Papers (5 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

10 pages, 2308 KiB  
Article
Martensitic Transformation and Barocaloric Effect in Co-V-Ga-Fe Paramagnetic Heusler Alloy
by Jie Liu, Zhe Li, Hongwei Liu, Litao Yu, Yuanlei Zhang, Yiming Cao, Kun Xu and Yongsheng Liu
Metals 2022, 12(3), 516; https://doi.org/10.3390/met12030516 - 17 Mar 2022
Cited by 5 | Viewed by 2058
Abstract
In the present study, polycrystalline Co50V34Ga16−xFex (1≤x≤2) quaternary Heusler alloys were fabricated by the arc-melting method. It was found that they undergo a paramagnetic martensitic transformation (MT) from the [...] Read more.
In the present study, polycrystalline Co50V34Ga16−xFex (1≤x≤2) quaternary Heusler alloys were fabricated by the arc-melting method. It was found that they undergo a paramagnetic martensitic transformation (MT) from the L21-type cubic austenitic structure to the D022 tetragonal martensitic structure. With the increase of the Fe concentration, the MT shifts towards a higher temperature range, which is strongly related to the variation of the valence electron concentration. Moreover, it was also found that the MT exhibited by every alloy is sensitive to the applied hydrostatic pressure due to a relatively high difference in volume between the two phases. By using the quasi-direct method based on caloric measurements, the barocaloric effect (BCE) associated with the hydrostatic pressure-driven MT was estimated in the studied alloys. The results demonstrated that the sample with x=1.5 performs an optimal BCE among these three alloys. Full article
(This article belongs to the Special Issue Novel Shape Memory Alloys)
►▼ Show Figures

Figure 1

10 pages, 3418 KiB  
Article
Effect of Mo Alloying on the Precipitation Behavior of B2 Nano-Particles in Fe-Mn-Al-Ni Shape Memory Alloys
by Liqiu Yong, Yang Zuo, Lixin Sun, Huabei Peng, Xuguang An, Hui Wang and Yuhua Wen
Metals 2022, 12(2), 261; https://doi.org/10.3390/met12020261 - 30 Jan 2022
Cited by 3 | Viewed by 2036
Abstract
In Fe-Mn-Al-Ni shape memory alloys, the stabilization of superelasticity would be affected by the undesired precipitation of B2 nano-particles during natural aging. In order to solve this problem, the effect of Mo alloying on the precipitation behavior of B2 nano-particles during the cooling [...] Read more.
In Fe-Mn-Al-Ni shape memory alloys, the stabilization of superelasticity would be affected by the undesired precipitation of B2 nano-particles during natural aging. In order to solve this problem, the effect of Mo alloying on the precipitation behavior of B2 nano-particles during the cooling and natural aging processes was performed by scanning electron microscope, transmission electron microscope and Vickers microhardness test in two Fe-Mn-Al-Ni-Mo shape memory alloys. The results showed that the formation of γ phase was completely suppressed after 15 °C and 80 °C water quenching as well as air cooling. However, B2 nano-particles were still precipitated after the three cooling processes, and their sizes and misfits increased with decreasing the cooling rates. In addition, the Vickers hardness increased after natural aging for 338 days, which indicated that it is not viable to inhibit the precipitation of B2 nano-particles during natural aging by Mo alloying in the Fe-Mn-Al-Ni shape memory alloys. Full article
(This article belongs to the Special Issue Novel Shape Memory Alloys)
►▼ Show Figures

Figure 1

8 pages, 4421 KiB  
Article
Shape Memory Effect and Martensitic Transformation in Fe–Mn–Al–Ni Alloy
by Rui Zhang, Deshan Sun, Chunmeng Ji, Yulin Chen, Xin Zhang and Zhizhong Dong
Metals 2022, 12(2), 247; https://doi.org/10.3390/met12020247 - 27 Jan 2022
Cited by 4 | Viewed by 2522
Abstract
In this study, the influence of an aging treatment on the shape memory effect and martensitic transformation was investigated in an Fe–Mn–Al–Ni alloy by adding a small amount of Nb and C elements. Results show that the aging treatment can significantly improve the [...] Read more.
In this study, the influence of an aging treatment on the shape memory effect and martensitic transformation was investigated in an Fe–Mn–Al–Ni alloy by adding a small amount of Nb and C elements. Results show that the aging treatment can significantly improve the shape recovery rate of the alloy. In the bending test with 4% deformation, after aging at 200 °C for 1 h, the recovery rate increased from 20 to 45%, and it further increased to 51% after the two-step aging treatment at 800 and 200 °C. The high-temperature in situ X-ray diffraction and atomic force microscope were used to reveal the shape memory effect between room temperature and 400 °C in this alloy due to γ′→α transformation. The microstructure of aged specimens was investigated using transmission electron microscopy. With the extension of the aging time from 0.5 to 6 h, the size of NiAl precipitation gradually grew from 9 to 32 nm, and the distribution became more uniform. Meanwhile, the NbC particles were found in the two-step aging treatment alloy, which was the key to improving the shape memory effect. Full article
(This article belongs to the Special Issue Novel Shape Memory Alloys)
►▼ Show Figures

Figure 1

13 pages, 4749 KiB  
Article
Novel Zr-Rich Alloys of Ternary Ti-Zr-Nb System with Large Superelastic Recovery Strain
by Danil Barilyuk, Andrey Bazlov, Natalia Arkharova, Tatyana Teplyakova, Anton Konopatsky and Sergey Prokoshkin
Metals 2022, 12(2), 185; https://doi.org/10.3390/met12020185 - 19 Jan 2022
Cited by 3 | Viewed by 2413
Abstract
Four novel superelastic alloys, Ti-41Zr-12Nb, Ti-42Zr-11Nb, Ti-43Zr-10Nb, Ti-44Zr-10Nb (at.%), were obtained and studied in terms of their microstructure and mechanical properties. The obtained alloys were subjected to thermomechanical treatment, providing alloys with a pronounced superelastic behavior. Materials phase composition and microstructure were studied [...] Read more.
Four novel superelastic alloys, Ti-41Zr-12Nb, Ti-42Zr-11Nb, Ti-43Zr-10Nb, Ti-44Zr-10Nb (at.%), were obtained and studied in terms of their microstructure and mechanical properties. The obtained alloys were subjected to thermomechanical treatment, providing alloys with a pronounced superelastic behavior. Materials phase composition and microstructure were studied using XRD and SEM methods. Based on the XRD results, maximum lattice strains in the 011β direction were calculated as 5.9%, 6.3%, 7.5%, and 7.2% for Ti-41Zr-12Nb, Ti-42Zr-11Nb, Ti-43Zr-10Nb, and Ti-44Zr-10Nb alloys, respectively. Mechanical properties of the thermomechanically-treated alloys were studied by Vickers microhardness testing, static tensile testing, and superelastic mechanical cycling. The maximum superelastic recovery strains attained at room temperature was 3.7%, 1.9%, 3.2%, and 3.0% for the Ti-41Zr-12Nb, Ti-42Zr-11Nb, Ti-43Zr-10Nb, and Ti-44Zr-10Nb alloys, respectively. Ti-41Zr-12Nb alloy demonstrated the highest ductility, with relative elongation to failure of over 20%, combined with the total recovery strain of more than 6%. Obtained results indicate that Ti-41Zr-12Nb is one the most promising alloys of the Ti-Zr-Nb system, with quite perfect superelastic behavior at room temperature. Full article
(This article belongs to the Special Issue Novel Shape Memory Alloys)
►▼ Show Figures

Figure 1

12 pages, 5382 KiB  
Article
Coexisting Multiple Martensites in Ni57−xMn21+xGa22 Ferromagnetic Shape Memory Alloys: Crystal Structure and Phase Transition
by Lian Huang, Daoyong Cong, Mingguang Wang and Yandong Wang
Metals 2021, 11(10), 1534; https://doi.org/10.3390/met11101534 - 26 Sep 2021
Cited by 2 | Viewed by 1490
Abstract
A comprehensive study of the crystal structure and phase transition as a function of temperature and composition in Ni57−xMn21+xGa22 (x = 0, 2, 4, 5.5, 7, 8) (at. %) magnetic shape memory alloys was performed [...] Read more.
A comprehensive study of the crystal structure and phase transition as a function of temperature and composition in Ni57−xMn21+xGa22 (x = 0, 2, 4, 5.5, 7, 8) (at. %) magnetic shape memory alloys was performed by a temperature-dependent synchrotron X-ray diffraction technique and transmission electron microscopy. A phase diagram of this Ni57−xMn21+xGa22 alloy system was constructed. The transition between coexisting multiple martensites with monoclinic and tetragonal structures during cooling was observed in the Ni51.5Mn26.5Ga22 (x = 5.5) alloy, and it was found that 5M + 7M multiple martensites coexist from 300 K to 160 K and that 5M + 7M + NM multiple martensites coexist between 150 K and 100 K. The magnetic-field-induced transformation from 7M martensite to NM martensite at 140 K where 5M + 7M + NM multiple martensites coexist before applying the magnetic field was observed by in situ neutron diffraction experiments. The present study is instructive for understanding the phase transition between coexisting multiple martensites under external fields and may shed light on the design of novel functional properties based on such phase transitions. Full article
(This article belongs to the Special Issue Novel Shape Memory Alloys)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-5
Back to TopTop