Special Issue "Advanced High Temperature Shape Memory Alloys"

A special issue of Crystals (ISSN 2073-4352).

Deadline for manuscript submissions: closed (30 September 2019).

Special Issue Editor

Dr. Yoko Yamabe-MItarai
Website
Guest Editor
National Institute for Materials Science Tsukuba, Tsukuba, Japan
Interests: high-temperature structural materials; Ti alloys; shape memory alloys; TiPd; creep; high-temperature deformation; oxidation behavior

Special Issue Information

Dear Colleagues,

Shape memory alloys are used as sensors and actuators, and some devises are used in a wide variety of application fields such as medical, home electrical appliances, and industries. Although some interesting alloys have been developed in the temperature range between 100 and 200 ˚C, applications at high temperatures are limited due to their poor shape recovery above 200 ˚C. The improvement of shape recovery, the strength of alloys at high temperatures, stable cyclic properties, and microstructures at high temperatures are crucial issues for high-temperature shape memory alloys.

We invite researchers to submit papers related to high-temperature shape memory alloys to discuss potential materials, the method of improvement of shape recovery, the strength of alloys, the stability of microstructure and cyclic properties, and the enhancement of the lifespan of high-temperature shape memory alloys, not only the alloys that can be used above 200˚C, but also the alloys that can be used between 100 and 200 ˚C. We also welcome papers that show possible applications for high-temperature shape memory alloys to encourage researchers working in this field.

Dr. Yoko Yamabe-MItarai
Guest Editor

Manuscript Submission Information

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Keywords

  • High-temperature shape memory alloys
  • High-temperature superelasticity
  • Martensitic phase transformation
  • High-temperature application of SMA
  • Actuator, sensor
  • Mechanical properties of SMA
  • Microstructure, twin structure

Published Papers (3 papers)

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Research

Open AccessArticle
Thermal Cyclic Properties of Ti-Pd-Pt-Zr High-Temperature Shape Memory Alloys
Crystals 2019, 9(11), 595; https://doi.org/10.3390/cryst9110595 - 14 Nov 2019
Cited by 2
Abstract
In this study, the thermal cyclic properties of Ti-(50−x)Pd-xPt-5Zr alloys (x = 5, 15, 25, at%), comprising B2 and B19 structures in austenite and martensite, were investigated by a thermal cyclic compression test under a constant load of between 15 and 200 MPa. [...] Read more.
In this study, the thermal cyclic properties of Ti-(50−x)Pd-xPt-5Zr alloys (x = 5, 15, 25, at%), comprising B2 and B19 structures in austenite and martensite, were investigated by a thermal cyclic compression test under a constant load of between 15 and 200 MPa. The transformation temperature measured using differential scanning calorimetry increased with increasing Pt concentration. The highest austenite finishing (Af) temperature, 648 °C, was obtained in the Ti-25Pd-25Pt-5Zr alloy. Irrecoverable strain due to thermal cyclic testing was observed during each test, even at a stress of 50 MPa. The work output, calculated as the product of the transformation strain and the applied stress from strain–temperature curves, decreased with increasing Pt concentration. This was because of the lower strength of the austenite phase due to Af increasing with an increase in the concentration of Pt. Although irrecoverable strain was observed with the first thermal cycle test, it decreased after several thermal cyclic tests, which are called training. Full article
(This article belongs to the Special Issue Advanced High Temperature Shape Memory Alloys)
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Open AccessArticle
The Microalloying Effect of Ce on the Mechanical Properties of Medium Entropy Bulk Metallic Glass Composites
Crystals 2019, 9(9), 483; https://doi.org/10.3390/cryst9090483 - 15 Sep 2019
Abstract
Novel ultra-strong medium entropy bulk metallic glasses composites (BMGCs) Fe65.4−xCexMn14.3Si9.4Cr10C0.9 and Ti40−xCexNi40Cu20 (x = 0, 1.0), through the martensite transformation induced plasticity (TRIP effect) to [...] Read more.
Novel ultra-strong medium entropy bulk metallic glasses composites (BMGCs) Fe65.4−xCexMn14.3Si9.4Cr10C0.9 and Ti40−xCexNi40Cu20 (x = 0, 1.0), through the martensite transformation induced plasticity (TRIP effect) to enhance both the ductility and work-hardening capability, were fabricated using magnetic levitation melting and copper mold suction via high frequency induction heating. Furthermore, the Ce microalloying effects on microstructure and mechanical behaviors were studied. The Fe-based BMGCs consisted of face-centered cubic (fcc) γ-Fe and body-centered cubic (bcc) α-Fe phase, as well as Ti-based BMGCs containing supercooled B2-Ti (Ni, Cu) and a thermally induced martensite phase B19’-Ti (Ni, Cu). As loading, the TRIP BMGCs exhibited work-hardening behavior, a high fracture strength, and large plasticity, which was attributed to the stress-induced transformation of ε-Fe martensite and B19’-Ti (Ni, Cu) martensite. Ce addition further improved the strengthening and toughening effects of TRIP BMGCs. Adding elemental Ce enhanced the mixing entropy ΔSmix and atomic size difference δ, while reducing the mixing enthalpy ΔHmix, thus improving the glass forming ability and delaying the phase transition process, and hence prolonging the work-hardening period before fracturing. The fracture strength σf and plastic stress εp of Ti39CeNi40Cu20 and Fe64.4CeMn14.3Si9.4Cr10C0.9 alloys were up to 2635 MPa and 13.8%, and 2905 MPa and 30.1%, respectively. Full article
(This article belongs to the Special Issue Advanced High Temperature Shape Memory Alloys)
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Open AccessArticle
Multi-Physics Bi-Functional Intelligent Meta-Device Based on the Shape Memory Alloys
Crystals 2019, 9(9), 438; https://doi.org/10.3390/cryst9090438 - 23 Aug 2019
Cited by 1
Abstract
Transformation theory, succeeding in multiple transportation systems, has enlightened researchers to manipulate the field distribution by tailoring the medium’s dominant parameters in certain situations. Therefore, the science community has witnessed a boom in designing metamaterials, whose abnormal properties are induced by artificial structures [...] Read more.
Transformation theory, succeeding in multiple transportation systems, has enlightened researchers to manipulate the field distribution by tailoring the medium’s dominant parameters in certain situations. Therefore, the science community has witnessed a boom in designing metamaterials, whose abnormal properties are induced by artificial structures rather than the components’ characteristics. However, a majority of such meta-devices are restricted to the particular physical regimes and cannot sense the changes taking place in the surrounding environment and adjust its functions accordingly. In this article we propose a multi-physics bi-functional “intelligent” meta-device which can switch its functions between an invisible cloak and a concentrator in both thermal and DC electric conduction as the ambient temperature or voltage varies. The shape memory alloys are utilized in the design to form a moveable part, which plays the crucial role in the switching effect. This work paves the way for a practicable method for obtaining a controllable gradient of heat or electric potential, and also provides guidance for efficiently designing similar intelligent meta-devices by referring to the intriguing property of shape memory alloys. Full article
(This article belongs to the Special Issue Advanced High Temperature Shape Memory Alloys)
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