Special Issue "New Aspects of Ferromagnetic Shape Memory Alloys: From Fabrication to Applications "

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

Deadline for manuscript submissions: 30 June 2020.

Special Issue Editor

Prof. Dr. Pablo Álvarez-Alonso
E-Mail Website
Guest Editor
Physics department, University of Oviedo, Calvo Sotelo, s/n, 33007 Oviedo, Spain
Interests: rapid-quenched materials; shape memory alloys; magnetocaloric effect; elastocaloric effect

Special Issue Information

Dear Colleagues,

Ferromagnetic shape memory alloys are functional materials that exhibit magnetomechanical coupling, the cause of the wide variety of attractive thermal, mechanical, magnetic, electrical, and optical properties. Among their most known behaviors, the magnetically controlled shape memory effect and caloric effects have attracted the largest attention, although researchers continue to delve into other features of these materials, such as novel martensite transformation arrest, exchange bias, and energy-harvesting.

These materials have demonstrated a great versatility in bulk and single-crystal shapes by tailoring the martensitic transformation through intrinsic and extrinsic parameters, as, for example, chemical composition and pressure, respectively; the development of high-temperature magnetic shape memory alloys is one of the largest exponents of this adaptability.

Even so, many efforts have been successfully done to push the functionality of the ferromagnetic shape memory alloys forward by means of new fabrication routes that reduce the dimensionality of these alloys, opening a world of opportunities in fields like biomedical science and micro/nano-electromechanical systems engineering.

Despite of all these achievements, there still exist challenges such as thermal hysteresis, thermal transport management, and brittleness, which constitute the driving force in the field of ferromagnetic shape memory alloys.

This Special Issue aims to bring the latest research in fabrication processes, characterization, modeling, and applications of ferromagnetic shape memory alloys.

The main topics covered include but are not limited to the following:

  • Production of low dimensionality ferromagnetic shape memory alloys;
  • Twin structure;
  • Magnetic field-induced strain;
  • Modelling of martensite transformation and magnetomechanical properties;
  • Caloric effects;
  • High-temperature magnetic shape memory actuation;
  • Energy-harvesting;
  • Biomedical applications.

Prof. Dr. Pablo Álvarez-Alonso
Guest Editor

Manuscript Submission Information

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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 2000 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

  • martensite transformation
  • rapid quenching
  • thin films
  • nanostructuration
  • magnetic shape memory effect
  • solid-state refrigeration
  • sensors and actuators
  • biocompatibility

Published Papers (1 paper)

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Research

Open AccessArticle
Optimizing the Caloric Properties of Cu-Doped Ni–Mn–Ga Alloys
Materials 2020, 13(2), 419; https://doi.org/10.3390/ma13020419 - 16 Jan 2020
Abstract
With the purpose to optimize the functional properties of Heusler alloys for their use in solid-state refrigeration, the characteristics of the martensitic and magnetic transitions undergone by Ni50Mn25−xGa25Cux (x = 3–11) alloys have been [...] Read more.
With the purpose to optimize the functional properties of Heusler alloys for their use in solid-state refrigeration, the characteristics of the martensitic and magnetic transitions undergone by Ni50Mn25−xGa25Cux (x = 3–11) alloys have been studied. The results reveal that, for a Cu content of x = 5.5–7.5, a magnetostructural transition between paramagnetic austenite and ferromagnetic martensite takes place. In such a case, magnetic field and stress act in the same sense, lowering the critical combined fields to induce the transformation; moreover, magnetocaloric and elastocaloric effects are both direct, suggesting the use of combined fields to improve the overall refrigeration capacity of the alloy. Within this range of compositions, the measured transformation entropy is increased owing to the magnetic contribution to entropy, showing a maximum at composition x = 6, in which the magnetization jump at the transformation is the largest of the set. At the same time, the temperature hysteresis of the transformation displays a minimum at x = 6, attributed to the optimal lattice compatibility between austenite and martensite. We show that, among this system, the optimal caloric performance is found for the x = 6 composition, which displays high isothermal entropy changes (−36 J·kg−1·K−1 under 5 T and −8.5 J·kg−1·K−1 under 50 MPa), suitable working temperature (300 K), and low thermal hysteresis (3 K). Full article
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