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Metals
Special Issues
Refractory Metals and Alloys
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Refractory Metals and Alloys

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

Deadline for manuscript submissions: closed (31 January 2016) | Viewed by 15880

Special Issue Editor

Dr. Rita Khanna

E-Mail Website
Guest Editor
The University of New South Wales, Sydney, Australia
Interests: High temperature reactions, Metals and Alloys, Refractories, Computer modelling and Simulation, Recycling electronic waste

Special Issue Information

Daer Colleagues,

Focussed specifically on refractory metals (Nb, Ta, Mo, W and Re) and their alloys, this issue seeks papers concerning the latest developments in their high temperature properties, corrosion resistance, and strengthening mechanisms including carbide, precipitate, solid-solution and dispersion strengthening. Further properties of interest are combination alloys, doped metals, oxidation behaviour, high temperature strength, low temperature ductility, refractory metals in in-situ composites, silicides, high temperature oxidation resistant coatings, role of defects, recrystallization, among others. Of interest also is the role of thermal treatment, thermo-mechanical treatment, metallurgical variables, cold working, strain hardening, substitution solid solution additions, dispersed phase additions, anisotropy on mechanical, thermal, elastic, magnetic and optical properties.

Dr. Rita Khanna
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

  • Refractory metals
  • alloys
  • strengthening mechanisms
  • oxidation resistant coatings
  • in situ composites
  • corrosion resistance
  • high temperature properties

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Published Papers (3 papers)

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Research

4725 KiB  
Article
Effects of Surface Structure and Chemical Composition of Binary Ti Alloys on Cell Differentiation
by Ok-Sung Han, Moon-Jin Hwang, Yo-Han Song, Ho-Jun Song and Yeong-Joon Park
Metals 2016, 6(7), 150; https://doi.org/10.3390/met6070150 - 4 Jul 2016
Cited by 2 | Viewed by 4395
Abstract
Binary Ti alloys containing Fe, Mo, V and Zr were micro-arc oxidized and hydrothermally treated to obtain micro- and nano-porous layers. This study aimed to investigate cell differentiation on micro and micro/nanoporous oxide layers of Ti alloys. The properties of the porous layer [...] Read more.
Binary Ti alloys containing Fe, Mo, V and Zr were micro-arc oxidized and hydrothermally treated to obtain micro- and nano-porous layers. This study aimed to investigate cell differentiation on micro and micro/nanoporous oxide layers of Ti alloys. The properties of the porous layer formed on Ti alloys were characterized by X-ray diffraction pattern, microstructural and elemental analyses and inductively coupled plasma mass spectrometry (ICP-MS) method. The MTT assay, total protein production and alkaline phosphatase (ALPase) activity were evaluated using human osteoblast-like cells (MG-63). Microporous structures of micro-arc oxidized Ti alloys were changed to micro/nanoporous surfaces after hydrothermal treatment. Micro/nanoporous surfaces consisted of acicular TiO2 nanoparticles and micron-sized hydroxyapatite particles. From ICP and MTT tests, the Mo and V ions released from porous oxide layers were positive for cell viability, while the released Fe ions were negative for cell viability. Although the micro/nanoporous surfaces led to a lower total protein content than the polished and microporous Ti surfaces after cell incubation for 7 days, they caused higher ALPase activities after 7 days and 14 days of incubation except for V-containing microporous surfaces. The micro/nanoporous surfaces of Ti alloys were more efficient in inducing MG-63 cell differentiation. Full article
(This article belongs to the Special Issue Refractory Metals and Alloys)
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4827 KiB  
Article
Effect of BaO Addition on Densification and Mechanical Properties of Al2O3-MgO-CaO Refractories
by Lei Liu, Min Chen, Lei Xu, Xueliang Yin and Wenjie Sun
Metals 2016, 6(4), 84; https://doi.org/10.3390/met6040084 - 11 Apr 2016
Cited by 14 | Viewed by 5392
Abstract
Considering the requirement for a reduction of refractory consumption, the present work investigated the fabrication of Al2O3-MgO-CaO-based refractory with BaO addition by means of solid-state reaction sintering. The effect of BaO addition on densification and the properties of the [...] Read more.
Considering the requirement for a reduction of refractory consumption, the present work investigated the fabrication of Al2O3-MgO-CaO-based refractory with BaO addition by means of solid-state reaction sintering. The effect of BaO addition on densification and the properties of the refractory were also discussed. Results indicated that the formation of calcium hexaluminate (CaO·6Al2O3, or CA6) grains with a high aspect ratio in the alumina-rich zone depressed the densification of the sample without BaO addition, resulting in a higher apparent porosity of 21.2%. When 6 wt. % BaO was added, a new phase of Ba2Mg6Al28O50 (BAM) with a lower aspect ratio was formed and the densification of the sample with an apparent porosity of 5.52% was promoted. In addition, mechanical performance was significantly improved due to an increase in compactness and modification of the microstructure. The cold compressive strength increased from 348 MPa to 569 MPa and the flexural strength increased from 178 MPa to 243 MPa by addition of 6 wt. % BaO. Meanwhile, the breadth of the widest crack after the thermal shock test decreased from 7 μm to 1 μm in the refractory. Full article
(This article belongs to the Special Issue Refractory Metals and Alloys)
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1120 KiB  
Article
Spectral Shift Amplification and Polarization-Controlled Spectral Shift with Silver Metal
by Pin Han and Yung-Chieh Tseng
Metals 2016, 6(1), 7; https://doi.org/10.3390/met6010007 - 26 Dec 2015
Cited by 3 | Viewed by 5075
Abstract
The spectral shift amplification effect and polarization-controlled spectral shifts are studied using silver (Ag) metal. The spectral shift amplification factor can be doubled by using silver compared with using water. The solid Ag metal surface also provides orientation freedom for polarization-controlled spectral shifts, [...] Read more.
The spectral shift amplification effect and polarization-controlled spectral shifts are studied using silver (Ag) metal. The spectral shift amplification factor can be doubled by using silver compared with using water. The solid Ag metal surface also provides orientation freedom for polarization-controlled spectral shifts, benefiting data transmission applications in any direction. The liquid water interface provides only limited direction at the Brewster angle. Besides those advantages, the higher reflectivity of Ag reflects higher spectral intensity, which makes the signal easier to detect. The spectral switch phenomenon that depends on the central wavelength variation is also presented. Full article
(This article belongs to the Special Issue Refractory Metals and Alloys)
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