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Metals
Special Issues
Advanced Manufacturing Processes for Shape Memory Alloys
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Advanced Manufacturing Processes for Shape Memory Alloys

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Additive Manufacturing".

Deadline for manuscript submissions: closed (15 April 2022) | Viewed by 5950

Special Issue Editors

Dr. Carlo Alberto Biffi

E-Mail Website
Guest Editor
National Research Council, Institute of Condensed Matter Chemistry and Technologies for Energy, Via G. Previati 1E, 23900 Lecco, Italy
Interests: National Research Council, Institute of Condensed Matter Chemistry and Technologies for Energy, Via G. Previati 1E, 23900 Lecco, Italy
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. João Pedro Oliveira

E-Mail Website
Guest Editor
CENIMAT/I3N, Department of Materials Science, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
Interests: advanced characterization; martensitic transformation; thermomechanical processing; welding; synchrotron radiation; additive manufacturing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The tendency of design and manufacturing high tech parts and products strongly requires the adoption of innovative materials, having high performance and possibly functional properties, to be processed via advanced manufacturing processes. As such, relevant efforts regarding unconventional methods of manufacturing have been done in the last years for developing new processes, including, but not limited to, Additive Manufacturing and ultra short laser materials processing, able to open the widespread of difficult to machine materials. Among these materials, Shape Memory Alloys can offer peculiar characteristics, able to produce mechanical work according to the shape memory effect or to enhance mechanical performances, in accordance to the pseudo-elastic behavior at body temperature. Nowadays, materials operating at high temperatures or materials with integrated biodegradable properties are just two examples of extra requirements, able to solve more challenging problems. The implementation of advanced manufacturing paths becomes a fundamental step for the realization of industrial components, limiting the modification of the functional properties of the material upon the processing operation. Finally, is the design of the device for enhancing the final performances, given by the integration of all the functionalities offered by the smart materials and the complex geometries of the components.

We hope that the present Special Issue would be an opportunity for creating a strong network between authors and readers working in some different sectors, such as materials science, metallurgy, manufacturing and design, according to the needs of multidisciplinary approach necessary for the use of Shape Memory Alloys for smart applications.

Dr. Carlo Alberto Biffi
Dr. João Pedro Oliveira
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

  • Shape Memory Alloys
  • Functional Materials
  • Nitinol
  • Advanced Manufacturing Processes
  • Laser Material Processing
  • Additive Manufacturing

Published Papers (2 papers)

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Research

17 pages, 6903 KiB  
Article
Automatic Actuation of the Anti-Freezing System Using SMA Coil Springs
by Daehwan Cho, Joonhong Park and Jaeil Kim
Metals 2021, 11(9), 1424; https://doi.org/10.3390/met11091424 - 09 Sep 2021
Cited by 4 | Viewed by 1918
Abstract
Studies have been actively conducted on systems that prevent the breakage of water pipes from freezing in winter. Shape memory alloy (SMA) coil springs have been used as the key components of actuators that can operate automatically by detecting the real-time outside temperature [...] Read more.
Studies have been actively conducted on systems that prevent the breakage of water pipes from freezing in winter. Shape memory alloy (SMA) coil springs have been used as the key components of actuators that can operate automatically by detecting the real-time outside temperature changes, but research on its use as an actuator that can operate at sub-zero temperatures is insufficient. This study proposes the anti-freezing system using Ni-44.08Ti-1.46Co (wt.%) SMA coil springs that operate near sub-zero temperatures to prevent the freezing accident of water pipes. After fabricating the SMA coil springs, the test for performance evaluation of the springs applied static load conditions was conducted on the specific outside temperature. To examine the operation of anti-freezing systems applied the SMA coil spring as an actuator, the water discharge test (WDT) was also conducted along with the computational fluid simulation. The results of water discharge measurement obtained by WDT, simulations, and theoretical equations applied to the fluid resupply system constructed were compared with each other to verify the reliability. Consequently, it was confirmed that water discharge can be automatically controlled in real time according to temperature changes of SMA coil springs in the anti-freezing system. Full article
(This article belongs to the Special Issue Advanced Manufacturing Processes for Shape Memory Alloys)
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21 pages, 6757 KiB  
Article
Laser Powder Bed Fusion of NiTiHf High-Temperature Shape Memory Alloy: Effect of Process Parameters on the Thermomechanical Behavior
by Mohammadreza Nematollahi, Guher P. Toker, Keyvan Safaei, Alejandro Hinojos, S. Ehsan Saghaian, Othmane Benafan, Michael J. Mills, Haluk Karaca and Mohammad Elahinia
Metals 2020, 10(11), 1522; https://doi.org/10.3390/met10111522 - 17 Nov 2020
Cited by 12 | Viewed by 2824
Abstract
Laser powder bed fusion has been widely investigated for shape memory alloys, primarily NiTi alloys, with the goal of tailoring microstructures and producing complex geometries. However, processing high temperature shape memory alloys (HTSMAs) remains unknown. In our previous study, we showed that it [...] Read more.
Laser powder bed fusion has been widely investigated for shape memory alloys, primarily NiTi alloys, with the goal of tailoring microstructures and producing complex geometries. However, processing high temperature shape memory alloys (HTSMAs) remains unknown. In our previous study, we showed that it is possible to manufacture NiTiHf HTSMA, as one of the most viable alloys in the aerospace industry, using SLM and investigated the effect of parameters on defect formation. The current study elucidates the effect of process parameters (PPs) on the functionality of this alloy. Shape memory properties and the microstructure of additively manufactured Ni-rich NiTiHf alloys were characterized across a wide range of PPs (laser power, scanning speed, and hatch spacing) and correlated with energy density. The optimum laser parameters for defect-free and functional samples were found to be in the range of approximately 60–100 J/mm3. Below an energy density of 60 J/mm3, porosity formation due to lack-of-fusion is the limiting factor. Samples fabricated with energy densities of 60–100 J/mm3 showed comparable thermomechanical behavior in comparison with the starting as-cast material, and samples fabricated with higher energy densities (>100 J/mm3) showed very high transformation temperatures but poor thermomechanical behavior. Poor properties for samples with higher energies were mainly attributed to the excessive Ni loss and resultant change in the chemical composition of the matrix, as well as the formation of cracks and porosities. Although energy density was found to be an important factor, the outcome of this study suggests that each of the PPs should be selected carefully. A maximum actuation strain of 1.67% at 400 MPa was obtained for the sample with power, scan speed, and hatch space of 100 W, 400 mm/s, and 140 µm, respectively, while 1.5% actuation strain was obtained for the starting as-cast ingot. These results can serve as a guideline for future studies on optimizing PPs for fabricating functional HTSMAs. Full article
(This article belongs to the Special Issue Advanced Manufacturing Processes for Shape Memory Alloys)
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