Special Issue "Nanostructural Processing Effects in Shape Memory Alloys"
Deadline for manuscript submissions: 20 January 2024 | Viewed by 5807
Precipitation hardening is the oldest nanotechnology. Since its first description, the international scientific community became aware of the crucial role that matter arrangement at nanostructural scale plays in understanding particular material characteristics such as shape memory phenomena. Moreover, various nanostructuring techniques have since been developed which enable the tailoring of material properties. Thus, the role of coherent precipitates in matrix strengthening against permanent deformation has been intensely studied with the aim of enhancing reverse martensitic transformation in shape memory alloys (SMAs). On the other hand, severe plastic deformation has been increasingly used as a nanoprocessing technique to produce new SMAs with superior mechanical properties, while twin boundary management successfully caused marked increases of shape recovery strains. Additionally, although larger oligocrystalline grains have recently been identified as desired structures for facilitating larger superelastic strains, no superelasticity would be obtained without matrix hardening by coherent nanoprecipitation.
This Special Issue aims to group, into a single volume, original articles concerning topics related but not limited to the role of nanostructuring, coherent nanoprecipitation, grain and twin boundary engineering, and so on, in the properties of shape memory alloys. We also welcome the submission of articles discussing the requirement to obtain large rather than small crystalline grains in order to enhance shape memory properties.
Prof. Dr. Leandru-Gheorghe Bujoreanu
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. Nanomaterials 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 2900 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.
- shape memory alloys
- martensitic transformation
- thermomechanical processing
- chemical composition
- back stress
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Title: Analysis of the degradation behavior of FeMnSi-Cu SMAs from macro to nano-scale
Authors: Ana-Maria Roman1; Ramona Cimpoesu1; Iban Amenabar2; Bogdan Pricop1; Monica Lohan1; Mihai Marius Cazacu3; Leandru Gheorghe Bujoreanu1; Iuliana Cocean4; Catalin Panaghie1; Georgeta Zegan5; Nicanor Cimpoeșu1
Affiliation: 1Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania. 2CIC NanoGUNE BRTA, Donostia San Sebastian 20018, Spain 3Physics department, “Gheorghe Asachi” Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania. 4Alexandru Ioan Cuza Univ, Fac Phys, 11 Carol I Bld, Iasi 700506, Romania 5Grigore T Popa Univ Med & Pharm, Fac Dent Med, Iasi 700115, Romania
Abstract: A new functional bio-material based on Fe-30Mn-5Si-xCu (x=1, 1.5 and 2 wt%) was obtained through the levitation induction melting process and evaluated as a biodegradable material. Iron-based biodegradable materials are considered a proper solution for medium-period implantation materials that can degrade in the body after a specific time for a body organ to heal. Alloying with manganese and low percentages of silicon can functionalize the alloy to exhibit a shape memory effect (SME) and copper to modify the transformation temperature domain and improve the antiseptic effect of the alloy. This alloy belongs to the class of biodegradable materials and can be functionalized considering the SME for specific medical applications. For this study, the degradation characteristics were assessed in vitro, by immersion tests into simulated body fluid (SBF) solution at 37±1 °C, by means of mass loss, monitoring the pH variation in the solution, open circuit potential, linear and cyclic potentiometry (OCP; LP and CP), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Fourrier-transform infrared spedctorscopy (FTIR) and nano-FTIR. The as-cast materials were thermo-mechanically worked through hot-rolling to obtain laminated plates. The thermal characteristics of the smart material were determined through differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). Atomic force microscopy (AFM) will be used to highlight nano and microstructural changes during hot-rolling process and DMA solicitations. The type of corrosion was generalized and for the first 3-5 days, a mass increase was observed on the basis of the compounds formed at the metallic material- electrolyte solution interface. The compounds formed on the surface were identified as mainly oxides that passed into the electrolyte solution. A degradation rate was calculated based on mass loss, surface area of the samples and immersion time. Mechanical dynamic behavior and dimensions of a lamella sample were evaluated after 30 days of immersion. Nano-compounds presence on the surface through atmospheric corrosion and after immersion in SBF were observed and evaluated with the Neaspec system using the nano-FTIR technique.