Special Issue "Intermetallics 2016"
A special issue of Metals (ISSN 2075-4701).
Deadline for manuscript submissions: closed (30 June 2016)
Dr. Ana Sofia Ramos
CEMUC®, Department of Mechanical Engineering, University of Coimbra, R.Luís Reis Santos, 3030-788 Coimbra, Portugal
Interests: Nanomaterials; Reactive materials; Titanium and nickel aluminides; Shape memory alloys; Reactive multilayer thin films; Phase transformations; In situ studies using synchrotron radiation; Micromanufacturing; Joining; Self-healing in metallic alloys
The combination of low density, high strength, and good corrosion resistance makes intermetallics promising for structural applications, especially at high temperatures and in severe environments. Intermetallic compounds can be produced from metals that exothermically react with each other, releasing energy that is useful for several applications, including joining. Furthermore, these materials also have potential for functional applications since some intermetallic phases have unique properties, such as shape memory or thermo electric effect. Intermetallic phases of interest include aluminides, silicides, Laves and Heusler phases, among others. As a result of the increasing demand for novel/advanced materials with improved properties, recent years have been marked by the return of intermetallics.
This Special Issue will cover recent progress and new developments regarding all aspects of intermetallic-based materials, including processing, joining, modeling, characterization, testing, and application. From the application perspective, contributions related to intermetallic-based materials intended for structural, as well as for functional, applications are welcome.
Papers focusing on innovative theoretical or experimental approaches to understand the complex relationship between structure, property, and functionality of intermetallic materials or multiphase alloys, where intermetallic compounds are the major constituents, are invited for inclusion in this Special Issue.
Dr. A. S. Ramos
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 papers will be 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 1000 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.
- Self-propagating high-temperature synthesis
- Shape memory alloys
- Intermetallic composites
- Reactive materials
- Modeling and numerical simulations
- Phase transformations
- Defects and diffusion mechanisms
- Environmental effects, including oxidation and corrosion
- Mechanical properties
- Fracture and crack growth
- Medical applications
- Energy storage applications
- Novel structural and functional applications
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: Homogeneity challenges in SLM manufacturing of Ti-Al intermetallic
Author: Pavel Krakhmalev
Affiliation: Karlstad University, Sweden
Abstract: The investigation of intermetallic layers fabricated by selective laser melting (SLM) of mixtures of Al and Ti elemental powders was carried out to understand a correlation of microstructure, homogeneity and phase constitution with laser processing parameters.
The results show challenges in manufacturing of homogeneous intermetallic material by means of SLM. The results revealed deviations in chemical composition of tracks compared to nominal mixture, phase constitution was also found different from equilibrium. The findings are discussed in relation to incomplete remixing of elements in the molten pool, possible evaporation of elements due to local melt overheating and rapid cooling preventing ordering processes. Opportunities to improve quality of intermetallic materials manufactured by SLM discussed in terms of optimization of laser parameters.
Title: Laser Welding of Open Cell Foams in Cuznal Shape Memory Alloy
Author: Carlo Biffi
Abstract: Cellular materials in shape memory alloys are very promising smart systems, able to combine functional properties of the material to lightness, stiffness and damping capacity of the cellular structure. The problem of their processing remains an open question with low modification of their properties. In this work the laser weldability of Cu73Zn21Al6 shape memory alloy in the form of open cell foams was studied. It was shown that the cellular structure can be successfully welded in lap joint configuration by using a thin plate of the same alloy. The geometrical characteristics of the joints was correlated to the process speed and the calorimetric properties were found not significantly affected by the laser process.
Title: Gas solid reaction rout toward the production of intermetallic from their corresponding oxide mixtures
Author: Hesham Ahmed, Ricardo Morales, Nurin Viswanathan and Seshadri Seetharaman
Abstract: Near-net shape forming of metallic components from metallic powders produced insitu from reduction of corresponding pure metal oxides has been not been explored to large extent. Such a process can be probably termed in short as “Reduction-Sintering” process. This methodology can be especially effective in producing components containing refractory metals. Additionally, insitu production of metallic powder from complex oxides containing more than one metallic element may result in insitu alloying during reduction, possibly at lower temperatures. With this motivation, In-situ reduction complex oxides mixtures containing more than one metallic element has been investigated intensively over a period of years in the department of materials science, KTH, Sweden. This review highlights the most important features of that investigation. The investigation includes not only synthesis of intermetallics and refractory metals using the gas solid reaction rout but also study the reaction kinetics and mechanism..Friendly environmentally gases like H2, CH4 and N2 were used for simultaneous reduction,carbourizationand nitridation, respectively.
Different techniques have been utilized. Thermogravimetric analyzer to accurately controls the process conditions and reactions kinetics. Fluidized bed technique has been utilized to study the possibility of bulk production of intermetallics compared to milligrams in TGA. Carburization and nitridation of nascent formed intermetallics were successfully carried out. A novel method based on material thermal property was explored to track the reaction progress and estimate the reaction kinetics. This method implies the dynamic measure of thermal diffusivity using laser flash method.
These efforts end up with a successful preparation of nanograinedintermtalics like Fe-Mo and Ni-Wi. Also, it ends up with simultaneous reduction and synthesis of Ni-WN and Ni-WC from their oxide mixtures in single step. This novel method was further developed to produce intermetallic coatings on cupper surfaces.