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Metals
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Magnetic Shape Memory Alloys
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Magnetic 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 (28 February 2023) | Viewed by 4135

Special Issue Editors

Dr. Yan Feng

E-Mail Website
Guest Editor
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Interests: shape memory alloy; martensitic phase transformation
Special Issues, Collections and Topics in MDPI journals
Dr. Li Gao

E-Mail Website
Guest Editor
College of Engineering Science and Technology, Shanghai Ocean University, Shanghai 201306, China
Interests: magnetic shape memory alloys; martensitic transformation

Special Issue Information

Dear Colleagues,

Magnetic shape memory alloy is a kind of very important shape memory alloy, which has been well developed in the past twenty years. The research on this topic focused on magnetic field induced strain, giant magnetoresistance, magnetocaloric effect and elastocaloric effect, as well as the preparation method, improvement of smart property and material characterization related to magnetic shape memory alloy. Therefore, this is also the topic of the Special Issue. Papers in this scope or concerning the physical and mechanical properties of magnetic shape memory alloy are favourably received in this issue.

Dr. Yan Feng
Dr. Li Gao
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. 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

  • magnetic field induced strain
  • elastocaloric effect
  • magnetic shape memory alloy
  • giant magnetoresistance
  • Heusler alloy

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Published Papers (2 papers)

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Research

9 pages, 1768 KiB  
Article
The Effect of Thermal Treatment on Microstructure and Thermal-Induced Martensitic Transformations in Ni44Fe19Ga27Co10 Single Crystals
by Ekaterina E. Timofeeva, Elena Yu. Panchenko, Maria V. Zherdeva, Aida B. Tokhmetova, Nikita Yu. Surikov, Yuriy I. Chumlyakov and Ibrahim Karaman
Metals 2022, 12(11), 1960; https://doi.org/10.3390/met12111960 - 16 Nov 2022
Cited by 2 | Viewed by 1424
Abstract
Heat treatments of single crystals of Ni44Fe19Ga27Co10 (at.%) shape memory alloys cause various microstructures of the high-temperature phase. The nanodomain structure, consisting of regions of the L21- and B2-phases, and nanosized particles are the [...] Read more.
Heat treatments of single crystals of Ni44Fe19Ga27Co10 (at.%) shape memory alloys cause various microstructures of the high-temperature phase. The nanodomain structure, consisting of regions of the L21- and B2-phases, and nanosized particles are the main parameters that change during heat treatments and determine the mechanism of nucleation and growth of martensite crystals, the size of thermal-induced martensite lamellae, the temperature Ms, and the temperature intervals of the martensitic transformation. In the as-grown single crystals, the high-temperature phase has only the L21-structure and the MT occurs at low (Ms = 125 K) temperatures due to the motion of the practically single interphase boundary in narrow temperature ranges of 3–7 K. The reduction in the volume fraction of the L21-phase to 40% and the formation of nanodomains (20–50 nm) of the L21-and B2-phases due to annealing at 1448 K for 1 h with quenching causes an increase in the MT temperatures by 80 K. The MT occurs in wide temperature ranges of 40–45 K because of multiple nucleation of individual large (300–500 µm) martensite lamellae and their growth. After aging at 773 K for 1 h, the precipitation of nanosized particles of the ω-phase in such a structure additionally increases the MT temperatures by 45 K. The MT occurs due to the multiple nucleation of packets of small (20–50 μm) martensite lamellae. Full article
(This article belongs to the Special Issue Magnetic Shape Memory Alloys)
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13 pages, 3472 KiB  
Article
Elastocaloric Effect in Aged Single Crystals of Ni54Fe19Ga27 Ferromagnetic Shape Memory Alloy
by Elena Y. Panchenko, Eleonora I. Yanushonite, Anna S. Eftifeeva, Aida B. Tokhmetova, Irina D. Kurlevskaya, Anton I. Tagiltsev, Nikita S. Surikov, Ekaterina E. Timofeeva and Yuri I. Chumlyakov
Metals 2022, 12(8), 1398; https://doi.org/10.3390/met12081398 - 22 Aug 2022
Cited by 10 | Viewed by 1955
Abstract
In the present study, the effect of γ′-phase dispersed particles on both the L21(B2)-10M/14M-L10 martensitic transformations and the elastocaloric effect in aged Ni54Fe19Ga27 single crystals oriented along the [001]-direction was investigated. It was experimentally shown [...] Read more.
In the present study, the effect of γ′-phase dispersed particles on both the L21(B2)-10M/14M-L10 martensitic transformations and the elastocaloric effect in aged Ni54Fe19Ga27 single crystals oriented along the [001]-direction was investigated. It was experimentally shown that aging strongly affects the elastocaloric properties of these crystals. The precipitation of semi-coherent γ′-phase particles up to 500 nm in size in the crystals aged at 773 K for 1 h leads to a 1.4 times increase in the operating temperature range of the elastocaloric effect up to ΔTSE = 270 K as compared with the initial as-grown crystals (ΔTSE = 197 K). The adiabatic cooling values ΔTad are similar for the as-grown crystals ΔTad = 10.9 (±0.5) K and crystals aged at 773 K ΔTad = 11.1 (±0.5) K. The crystals containing incoherent γ′-phase particles sized 5–35 μm (after aging at 1373 K for 0.5 h) possess an operating temperature range of ΔTSE = 255 K with slightly smaller adiabatic cooling ΔTad below 9.7 (±0.5) K. The aged [001]-oriented Ni54Fe19Ga27 single crystals demonstrate high cyclic stability: the number of cycles does not influence the adiabatic cooling values and parameters of loading/unloading curves regardless of the particle size. The ways to improve the elastocaloric cooling parameters and stability of the elastocaloric effect by means of dispersed particles in the NiFeGa ferromagnetic shape memory alloy were discussed. Full article
(This article belongs to the Special Issue Magnetic Shape Memory Alloys)
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