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Metals
Special Issues
Frontiers in Nanostructured Metals and Alloys
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Frontiers in Nanostructured Metals and Alloys

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

Deadline for manuscript submissions: closed (30 June 2019) | Viewed by 4804

Special Issue Editor

Prof. Mark A. Atwater

E-Mail Website
Guest Editor
Department of Applied Engineering, Safety and Technology, Millersville University, Millersville, PA 17551, USA
Interests: nanostructured metals for functional applications; solid state processing of porous metals and alloys; catalytic deposition of carbon nanofibers and bulk component development; manufacturing methods for nanoscale materials

Special Issue Information

Dear Colleagues,

Despite decades of research, nanostructured metals and alloys are still providing new and unique properties to serve in ever more diverse applications. The understanding of and ability to control microstructural development during processing has led to many exciting reports of superior strength and improved ductility, enhanced thermal stability, tunable corrosion properties, and many other important advancements. The ability to create nonequilibrium alloys and nanoscale dispersions of insoluble phases has been the cornerstone of achieving these results. This Special Issue will feature recent developments and unique applications for nanostructured metals and alloys. Submissions should consider how the work may serve as model for and inspire more research in the content area. Specifically, original research on the following topics is encouraged:

  • New and atypical applications for nanostructured metals and alloys, such as catalysis, sensing, energy generation and storage, etc.
  • Microstructural tuning of metals and alloys, including inhomogeneous distributions of grain size (gradient, bimodal, etc.) and phase formation and separation, in order to achieve multi-phase alloys and composites during processing (e.g., mechanical alloying, deposition, surface attrition, heating/cooling cycles, etc.)
  • New processing strategies to increase throughput and achieve unique control of microstructure (new surfactants, multi-step processing to create unique microstructures, methods to scale production and reduce cost, new powder consolidation strategies, etc.)

Prof. Mark A. Atwater
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 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

  • Functional alloys
  • Nanocrystalline metals
  • Phase segregation
  • In-situ reactions
  • Catalysis
  • Energy storage
  • Metal–matrix composites
  • Nonequilibrium alloys
  • Amorphous alloys

Published Papers (2 papers)

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Research

9 pages, 2762 KiB  
Article
Tying Processing Parameters to the Microstructure and Mechanical Properties of Nanostructured FeNiZr Consolidated via the Field Assisted Sintering Technique
by Sean J. Fudger, Thomas L. Luckenbaugh, Anthony J. Roberts, Chris D. Haines and Kris A. Darling
Metals 2019, 9(4), 436; https://doi.org/10.3390/met9040436 - 13 Apr 2019
Cited by 5 | Viewed by 1967
Abstract
An oxide-dispersion-strengthened (ODS) nanostructured FeNiZr alloy was fabricated via high energy mechanical alloying, and subsequently consolidated by the field assisted sintering technique (FAST). A range of input parameters: Temperature, hold time and pressure were evaluated in an effort to optimize the mechanical response [...] Read more.
An oxide-dispersion-strengthened (ODS) nanostructured FeNiZr alloy was fabricated via high energy mechanical alloying, and subsequently consolidated by the field assisted sintering technique (FAST). A range of input parameters: Temperature, hold time and pressure were evaluated in an effort to optimize the mechanical response of the material. Improvements in density, up to 98.6% of theoretical, were observed with increasing consolidation temperature and hold time at the cost of decreasing hardness values resulting from microstructural coarsening. Hardness values decreased from 650 to 275 HV by increasing processing temperatures from 750 to 1100 °C. The relationships between the varied processing parameters, microstructure and the experimentally measured yield and ultimate tensile strengths are discussed. Specifically, the effect of varying the temperature and hold time on the resulting porosity, as observed via scanning electron microscopy (SEM) in tensile and compression samples, is emphasized. Full article
(This article belongs to the Special Issue Frontiers in Nanostructured Metals and Alloys)
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10 pages, 2806 KiB  
Article
Enhanced Performance of Bimetallic Co-Pd Catalysts Prepared by Mechanical Alloying
by Steven J. Knauss, Laura N. Guevara and Mark A. Atwater
Metals 2019, 9(3), 335; https://doi.org/10.3390/met9030335 - 16 Mar 2019
Cited by 3 | Viewed by 2393
Abstract
Bimetallic catalysts can provide enhanced performance, and Co-based catalysts in particular have been studied in various respects for their activity in the deposition of carbon nanofibers (CNFs). The majority of studies on CNF catalysis use co-precipitation to create alloys, but recent work has [...] Read more.
Bimetallic catalysts can provide enhanced performance, and Co-based catalysts in particular have been studied in various respects for their activity in the deposition of carbon nanofibers (CNFs). The majority of studies on CNF catalysis use co-precipitation to create alloys, but recent work has demonstrated the suitability of mechanical alloying (MA) by ball milling to reduce cost and increase catalytic activity. This work establishes the unique ability of MA to control the microstructure to produce bimetallic composites, which retain distinct metallic phases that improve catalytic activity. It is demonstrated that Co-Pd alloys reach a maximum in catalytic activity at an intermediate time of mechanical activation, where 30 min of milling outperformed samples milled for 5, 15, 60, and 240 min at a reaction temperature of 550 °C and a 1:4 C2H4:H2 reactant ratio. This indicates there is benefit to retaining the metals in distinct phases in close proximity. Ball milling provides a relatively simple and scalable method to achieve these unique microstructures, and in the optimal condition tested here, the activity toward carbon deposition is increased fourfold over prior work. Furthermore, the minimum temperature for deposition is also reduced. The characteristics of these materials, the effects of milling and annealing, and the underlying mechanisms of deposition are discussed. Full article
(This article belongs to the Special Issue Frontiers in Nanostructured Metals and Alloys)
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