Special Issue "Advanced Non-Equilibrium Metallic Materials "

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: 15 February 2020

Special Issue Editor

Guest Editor
Prof. Dr. Dmitri V. Louzguine

WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-Ku, Sendai, 980-8577, Japan
Website | E-Mail
Interests: physical metallurgy of high strength alloys and metallic glasses; characterization; deformation; phase transformations

Special Issue Information

Dear Colleagues,

The production of modern engineering structures, high technology instruments and machine parts is impossible without the further development of advanced structural and functional metallic materials, which still represent the main class of materials used in engineering (machinery, civil, aerospace, automobile, etc.). Depending on the application field, these alloys should satisfy various requirements. Many of them must exhibit high strength, good plasticity and more importantly high fracture toughness, either high electrical conductivity or high electrical resistance, either soft or hard ferromagnetic properties, good corrosion resistance, etc. These properties are determined by an internal alloy structure that is either crystalline/quasi-crystalline or amorphous/glassy. In turn, the structure of the alloy depends on the composition and the material processing route. As there are links between the chemical composition and the structure, between the material processing route and the structure, and finally between the material structure and properties, various aspects of the materials science of advanced non-equilibrium metallic materials will be considered in the present issue.

Prof. Dr. Dmitri V. Louzguine
Guest Editor

Manuscript Submission Information

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Keywords

  • Non-equilibrium
  • Metallic
  • Materials
  • Alloys
  • Nanocrystalline
  • Glasses

Published Papers (3 papers)

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Research

Open AccessArticle
Phase Formation and Magnetic Properties of Melt Spun and Annealed Nd-Fe-B Based Alloys with Ga Additions
Metals 2019, 9(5), 497; https://doi.org/10.3390/met9050497
Received: 20 March 2019 / Revised: 19 April 2019 / Accepted: 26 April 2019 / Published: 28 April 2019
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Abstract
The structural transformations and magnetic property changes of the Nd16.2FebalCo9.9Ga0.5B7.5 (SG1, SG2) and Nd15.0FebalGa2.0B7.3 (SG3) nanocomposite alloys obtained by melt spinning in the as-quenched state and after [...] Read more.
The structural transformations and magnetic property changes of the Nd16.2FebalCo9.9Ga0.5B7.5 (SG1, SG2) and Nd15.0FebalGa2.0B7.3 (SG3) nanocomposite alloys obtained by melt spinning in the as-quenched state and after annealing at a temperature range of 560–650 °C for 30 min were studied. The methods used were X-ray diffraction analysis, magnetic property measurements, TEM studies, X-ray fluorescence analysis and Mössbauer spectroscopy. Amorphous phase and crystalline phase Nd2Fe14B (P42/mnm) were observed in the alloy after melt spinning. The content of the amorphous phase ranged from 20% to 50% and depended on the cooling rate. Annealing of the alloys resulted in amorphous phase crystallization into Nd2Fe14B and led to the increased coercivity of the alloys up to 1840 kA/m (23.1 kOe) at 600 °C annealing for 30 min. The alloy with the maximum coercivity had a grain size of the Nd2Fe14B phase ≈50–70 nm with an Nd-rich phase between grains. Full article
(This article belongs to the Special Issue Advanced Non-Equilibrium Metallic Materials )
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Open AccessArticle
Structure and Thermal Properties of an Al-Based Metallic Glass-Polymer Composite
Metals 2018, 8(12), 1037; https://doi.org/10.3390/met8121037
Received: 30 October 2018 / Revised: 21 November 2018 / Accepted: 4 December 2018 / Published: 7 December 2018
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Abstract
A composite material based on polyethylene terephthalate (PET, about 1% by mass) and Al85Y8Ni5Co2 metallic glass was obtained by mechanical alloying and consequent spark plasma sintering. The spark plasma sintering was performed at a temperature near [...] Read more.
A composite material based on polyethylene terephthalate (PET, about 1% by mass) and Al85Y8Ni5Co2 metallic glass was obtained by mechanical alloying and consequent spark plasma sintering. The spark plasma sintering was performed at a temperature near to the super cooled liquid region of the metallic glass. Mechanical properties and the structural characterization of the composite material were obtained. It was conceived that composite samples (Al85Y8Ni5Co2/PET) have a better thermal conductivity in comparison with pure PET samples. The formation of the crystalline phases causes degradation of physical properties. It was calculated that the activation energy for crystallization of the Al85Ni5Y8Co2 metallic glass is higher than that of the other types of metallic glasses (Mg67.5Ca5Zn27.5 and Cu54Pd28P18) used for composite preparation previously. This denotes a good thermal stability of the chosen metallic glass. Full article
(This article belongs to the Special Issue Advanced Non-Equilibrium Metallic Materials )
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Graphical abstract

Open AccessArticle
Synthesis of Ni-Ti Coatings on Different Metallic Substrates by Mechanical Alloying and Subsequent Laser Treatment
Metals 2018, 8(7), 490; https://doi.org/10.3390/met8070490
Received: 17 May 2018 / Revised: 10 June 2018 / Accepted: 22 June 2018 / Published: 27 June 2018
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Abstract
In this work, we proposed a novel mechanical alloying method to deposit Nix-Tixintermetallic coating on various metallic substrates using laser treatment. Three different substrates (Al-based alloy, Ti-based alloy, and hypoeutectoid steel) were used, and 50–70 μm thick Nix [...] Read more.
In this work, we proposed a novel mechanical alloying method to deposit Nix-Tixintermetallic coating on various metallic substrates using laser treatment. Three different substrates (Al-based alloy, Ti-based alloy, and hypoeutectoid steel) were used, and 50–70 μm thick NixTix coating was deposited during the process. For mechanical alloying, we used a self-constructed vibratory ball mill (single chamber) and for laser treatment, we used a “TrumpfTruDisk 1000” machine equipped with a four-dimensional control system “Servokon” designed specifically for experimental studies. Different laser beam intensities were used for laser operation. The cross-sectional microstructures of coatings were studied using a scanning electron microscope equipped with a Bruker energy-dispersive X-ray Spectrometer (EDS). Additional investigation of a cross-sectional area of one of the NixTix-coated samples was performed with field emission high-performance SEM and focused ion beam (FIB). Phase compositions of the obtained coatings, before and after laser treatment, were analyzed using X-Ray diffraction method. After the deposition process, the micro-hardness of the coatings was measured using a Vickers hardness tester. The structure and morphology of the obtained coatings were investigated. Full article
(This article belongs to the Special Issue Advanced Non-Equilibrium Metallic Materials )
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Graphical abstract

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