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Metals
Special Issues
Synthesis and Properties of Metallic Multilayers
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Synthesis and Properties of Metallic Multilayers

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

Deadline for manuscript submissions: closed (31 January 2019) | Viewed by 6093

Special Issue Editor

Prof. Dr. James E. Krzanowski

E-Mail Website
Guest Editor
Mechanical Engineering Department, University of New Hampshire, Kingsbury Hall, 33 Academic Way, Durham, NH 03824, USA
Interests: nitrides; carbides; sputter deposition; ion-assisted deposition; wear; friction; tool coatings
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Metallic multilayers can be defined as artificially synthesized materials consisting of periodic alternating layers of two distinct metallic components. Multilayer samples can be synthesized by a variety of methods, including sputter deposition, electrochemical deposition, and accumulative roll bonding. A primary characteristic of multilayers is the combined thickness of two layers (one bilayer) commonly referred to as the multilayer wavelength, which can range from a few nanometers to several microns. Another important characteristic of multilayers is the extent of crystallographic coherency between layers, which can lead to strained layers, partially coherent layers with extensive interfacial dislocation networks, or incoherent interfaces. The nature of the interface is strongly dependent on the deposition parameters and fabrication methods, and understanding this process/structure relationship is an important area of research. The mechanical properties of metallic multilayers continue to receive strong interest from the research community along with magnetic properties (particularly for alternating ferromagnetic/paramagnetic components). Multilayer applications of interest include X-ray mirrors and foils used for brazing applications using self-propagating reactions.

This Special Issue aims to present the latest research results in the area of synthesis, processing, properties and characterization of multilayer structures. The focus is on systems where at least one of the components in the multilayer is a metallic component. Studies of the constituent layers, such as research on the structure interfaces in bilayer samples, are also welcome.

Prof. Dr. James E. Krzanowski
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

  • Multilayer materials
  • Artificial superlattices
  • Thin-film interfaces

Published Papers (2 papers)

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Research

10 pages, 2087 KiB  
Article
Molecular Simulations of Sputtering Preparation and Transformation of Surface Properties of Au/Cu Alloy Coatings Under Different Incident Energies
by Linxing Zhang, Sen Tian and Tiefeng Peng
Metals 2019, 9(2), 259; https://doi.org/10.3390/met9020259 - 21 Feb 2019
Cited by 19 | Viewed by 3189
Abstract
The surface properties of coatings during deposition are strongly influenced by temperature, particle fluxes, and compositions. In addition, the precursor incident energy also affects the surface properties of coatings during sputtering. The atomistic processes associated with the microstructure of coatings and the surface [...] Read more.
The surface properties of coatings during deposition are strongly influenced by temperature, particle fluxes, and compositions. In addition, the precursor incident energy also affects the surface properties of coatings during sputtering. The atomistic processes associated with the microstructure of coatings and the surface morphological evolution during sputtering are difficult to observe. Thus, in the present study, molecular dynamics simulation was employed to investigate the surface properties of Au/Cu alloy coatings (Cu substrate sputtering by Au atoms) with different incident energies (0.15 eV, 0.3 eV, 0.6 eV). Subsequently, the sputtering depth of the Au atoms, the particle distribution of the Au/Cu alloy coating system, the radial distribution function of particles in the coatings, the mean square displacement of the Cu atoms in the substrate, and the roughness of the coatings were analyzed. Results showed that the crystal structure and the sputtering depth of Au atoms were hardly influenced by the incident energy, and the incident energy had little impact on the motion of deep-lying atoms in the substrate. However, higher incident energy resulted in higher surface temperature of coatings, and more Au atoms existed in the coherent interface. Moreover, it strengthened the motion of Cu atoms and reduced the surface roughness. Therefore, the crystal structure of coatings and the motions of deep-lying atoms in the substrate are not influenced by the incident energy. However, the increase in incident energy will enhance the combination of coatings and the base while optimizing the surface structure. Full article
(This article belongs to the Special Issue Synthesis and Properties of Metallic Multilayers)
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10 pages, 4631 KiB  
Article
Interaction between Ni/Ti Nanomultilayers and Bulk Ti-6Al-4V during Heat Treatment
by André João Cavaleiro, Ana Sofia Ramos, Francisco Braz Fernandes, Carsten Baehtz and Maria Teresa Vieira
Metals 2018, 8(11), 878; https://doi.org/10.3390/met8110878 - 27 Oct 2018
Cited by 5 | Viewed by 2341
Abstract
The diffusion bonding of Ti-6Al-4V to NiTi alloys assisted by Ni/Ti reactive multilayer thin films indicates the diffusion of Ni from the filler material towards bulk Ti-6Al-4V. As a consequence, the fragile NiTi2 intermetallic phase is formed at the joint interface. In [...] Read more.
The diffusion bonding of Ti-6Al-4V to NiTi alloys assisted by Ni/Ti reactive multilayer thin films indicates the diffusion of Ni from the filler material towards bulk Ti-6Al-4V. As a consequence, the fragile NiTi2 intermetallic phase is formed at the joint interface. In this context, the aim of this work is to investigate the occurrence of Ni diffusion from Ni/Ti nanomultilayers towards Ti-6Al-4V substrates. For this purpose, multilayer coated Ti alloys were studied in situ at increasing temperatures using synchrotron radiation. After heat treatment, scanning electron microscopy (SEM) analyses were carried out and elemental map distributions were acquired by electron probe microanalysis (EPMA). The EPMA maps confirm the occurrence of Ni diffusion; the presence of Ni in the substrate regions immediately underneath the nanomultilayers is clearly indicated and becomes more pronounced as the temperature increases. The presence of Ni is observed in the same locations where V is found, thus in β-Ti grains of Ti-6Al-4V. At the same time, the synchrotron results together with SEM analyses allow the increase of the amount of β-Ti phase in Ti-6Al-4V to be identified, while the thin films are mainly constituted by NiTi2. Therefore, the presence of the brittle NiTi2 intermetallic phase can be avoided if Ni diffusion is prevented. Full article
(This article belongs to the Special Issue Synthesis and Properties of Metallic Multilayers)
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