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Special Issue "Intermetallic Alloys: Fabrication, Properties and Applications 2017"

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

Deadline for manuscript submissions: 31 December 2017

Special Issue Editor

Guest Editor
Prof. Dr. Louisa Meshi

Department of Materials Engineering, Ben Gurion University of the Negev, Beer Sheva, Israel
Website | E-Mail

Special Issue Information

Dear Colleagues,

Our world advances rapidly. New materials are needed to face novel applications. In the past, new materials were found mostly by applying a "trial and error" approach. The need for generalization and a quicker path towards discoveries pushed governments all over the world to sponsor the so-called "Materials Genome Initiative", i.e., an initiative to identify potential materials with unique properties through systematization of knowledge and the combination of theory and experiment. Thus, new theories and rules are being developed in order to predict the functional materials of tomorrow. Most of the research points to intermetallics. The class of intermetallics possesses an excellent combination of high strength, low density and good corrosion resistance, especially at higher temperatures and in severe environments. Some of intermetallides also exhibit interesting electric–magnetic properties (such as shape memory, thermo-electricity, magnetic ordering, superconductivity, and many others). However, these materials have some drawbacks, such as combination of high strength and poor ductility and lack of industrialized manufacturing and processing technologies. Many specialists all over the world address these drawbacks. Examples of such efforts are iron aluminides and titanium aluminides, which are prominent lightweight, creep- and oxidation-resistant materials, used today in aircraft engines, raising efficiency and reducing weight and CO2 and NOx emissions. Another difficulty encountered in the research of intermetallics is characterization. Potential applications usually require intermetallides to be embedded in more ductile metallic matrices. In such cases, intermetallics appear as small precipitates in multiphase alloys. Characterization of the atomic structure of such nano-sized precipitates is a challenge in of itself. The current Special Issue, "Intermetallic Alloys: Fabrication, Properties and Applications" invites researchers working in all the listed topics to publish their work. Both theoretical and experimental research, review articles, and novel results are welcome. 

Prof. Dr. Louisa Meshi
Guest Editor

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. Materials 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 1500 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

  • Intermetallics
  • Alluminides
  • TEM
  • SEM
  • XRD
  • Characterization
  • Crystal structure
  • Microstructure
  • Sintering
  • Cast
  • Wrought
  • Mechanical properties
  • Magnetic properties
  • Manufacturing
  • DFT
  • Phase diagram
  • Metallurgy
  • Light-weight alloys
  • Refractory

Published Papers (2 papers)

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Research

Open AccessArticle Largest Magnetic Moments in the Half-Heusler Alloys XCrZ (X = Li, K, Rb, Cs; Z = S, Se, Te): A First-Principles Study
Materials 2017, 10(9), 1078; doi:10.3390/ma10091078
Received: 7 August 2017 / Revised: 11 September 2017 / Accepted: 12 September 2017 / Published: 14 September 2017
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Abstract
A recent theoretical work indicates that intermetallic materials LiMnZ (Z = N, P) with a half-Heusler structure exhibit half-metallic (HM) behaviors at their strained lattice constants, and the magnetic moments of these alloys are expected to reach as high as 5 μB
[...] Read more.
A recent theoretical work indicates that intermetallic materials LiMnZ (Z = N, P) with a half-Heusler structure exhibit half-metallic (HM) behaviors at their strained lattice constants, and the magnetic moments of these alloys are expected to reach as high as 5 μB per formula unit. (Damewood et al. Phys. Rev. B 2015, 91, 064409). This work inspired us to find new Heusler-based half-metals with the largest magnetic moment. With the help of the first-principles calculation, we reveal that XCrZ (X = K, Rb, Cs; Z = S, Se, Te) alloys show a robust, half-metallic nature with a large magnetic moment of 5 μB at their equilibrium and strained lattice constants in their most stable phases, while the excellent HM nature of LiCrZ (Z = S, Se, Te) alloys can be observed in one of their metastable phases. Moreover, the effects of uniform strain in LiCrZ (Z = S, Se, Te) alloys in type II arrangement have also been discussed. Full article
(This article belongs to the Special Issue Intermetallic Alloys: Fabrication, Properties and Applications 2017)
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Open AccessArticle Accessing Colony Boundary Strengthening of Fully Lamellar TiAl Alloys via Micromechanical Modeling
Materials 2017, 10(8), 896; doi:10.3390/ma10080896
Received: 26 June 2017 / Revised: 27 July 2017 / Accepted: 31 July 2017 / Published: 3 August 2017
Cited by 1 | PDF Full-text (4110 KB) | HTML Full-text | XML Full-text
Abstract
In this article, we present a strategy to decouple the relative influences of colony, domain and lamella boundary strengthening in fully lamellar titanium aluminide alloys, using a physics-based crystal plasticity modeling strategy. While lamella and domain boundary strengthening can be isolated in experiments
[...] Read more.
In this article, we present a strategy to decouple the relative influences of colony, domain and lamella boundary strengthening in fully lamellar titanium aluminide alloys, using a physics-based crystal plasticity modeling strategy. While lamella and domain boundary strengthening can be isolated in experiments using polysynthetically twinned crystals or mircomechanical testing, colony boundary strengthening can only be investigated in specimens in which all three strengthening mechanisms act simultaneously. Thus, isolating the colony boundary strengthening Hall–Petch coefficient K C experimentally requires a sufficient number of specimens with different colony sizes λ C but constant lamella thickness λ L and domain size λ D , difficult to produce even with sophisticated alloying techniques. The here presented crystal plasticity model enables identification of the colony boundary strengthening coefficient K C as a function of lamella thickness λ L . The constitutive description is based on the model of a polysynthetically twinned crystal which is adopted to a representative volume element of a fully lamellar microstructure. In order to capture the micro yield and subsequent micro hardening in weakly oriented colonies prior to macroscopic yield, the hardening relations of the adopted model are revised and calibrated against experiments with polysynthetically twinned crystals for plastic strains up to 15%. Full article
(This article belongs to the Special Issue Intermetallic Alloys: Fabrication, Properties and Applications 2017)
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Figure 1

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