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Metals
Special Issues
Advances in Titanium and Titanium Alloys
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Advances in Titanium and Titanium Alloys

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

Deadline for manuscript submissions: closed (30 August 2024) | Viewed by 6590

Special Issue Editors

Prof. Dr. Hongzhi Niu

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Interests: powder metallurgy; additive manufacturing; mechanical behavior of titanium alloys and TiAl intermetallics
Dr. Changjiang Zhang

E-Mail Website
Guest Editor
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Interests: thermoplastic forming; titanium alloy; titanium matrix composites; titanium/steel cladding plates

Special Issue Information

Dear Colleagues,

Significant advancements have been made in the fields of advanced manufacturing and forming, alloy development, microstructural design, and enhancement of mechanical properties of titanium-based alloys. The rapid progress in advanced manufacturing technologies and alloy design concepts has brought about a continuous reduction in the manufacturing cost of titanium alloys while simultaneously improving their service performance. This has greatly facilitated the widespread engineering applications of advanced titanium alloys and their components.

This Special Issue aims to present the latest academic achievements and research progress related to titanium-based alloys, including (but not limited to) alloy development, microstructure design, microstructure–property relationships, as well as advanced manufacturing technologies. We welcome original research articles and reviews that focus on cutting edge academic accomplishments concerning novel concepts in alloy design and advanced manufacturing technologies that enhance the service performance and promote applications of titanium alloys and TiAl intermetallics.

We look forward to receiving your contributions.

Prof. Dr. Hongzhi Niu
Dr. Changjiang Zhang
Guest Editors

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

  • new titanium alloys
  • titanium matrix composite
  • TiAl intermetallics
  • powder metallurgy
  • additive manufacturing
  • advanced plastic processing and forming
  • coating and corrosion
  • microstructural design
  • mechanical properties

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (3 papers)

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Research

15 pages, 8559 KiB  
Article
Characterization of Corrosion Products on TiSi, TiAl, and WTi Coatings
by Oscar Gordillo, Williams Steve Hincapie, Oscar Piamba, Jhon Olaya, José Edgar Alfonso, Gil Capote and Vladimir Trava-Airoldi
Metals 2024, 14(10), 1131; https://doi.org/10.3390/met14101131 - 4 Oct 2024
Viewed by 902
Abstract
This study investigates the corrosion products present on TiSi, AlTi, and WTi coatings deposited onto Ti6Al4V titanium alloy substrates using the RF sputtering PVD technique. Following deposition, the coatings underwent exposure to a temperature of 600 °C for 100 h. The corroded surfaces [...] Read more.
This study investigates the corrosion products present on TiSi, AlTi, and WTi coatings deposited onto Ti6Al4V titanium alloy substrates using the RF sputtering PVD technique. Following deposition, the coatings underwent exposure to a temperature of 600 °C for 100 h. The corroded surfaces were meticulously characterized to identify the resultant corrosion products. Utilizing scanning electron microscopy (SEM), X-ray diffraction, optical profilometry, and XPS spectroscopy, the coatings were comprehensively examined. Furthermore, Raman mapping with multivariate analysis was employed to determine the spatial distribution of oxides in the coating post-high-temperature corrosion. Additionally, XPS spectroscopy unveiled the presence of species undetected by Raman spectroscopy, such as silicon oxide SiO2, aluminum oxide Al2O3, and tungsten oxide WO2, in oxidation studies on TiSi, AlTi, and WTi coatings, corroborated by XRD analysis. The results allowed us to propose the corrosion mechanisms of these coatings and to determine that the TiSi coating exhibits a superior high-temperature corrosion response compared to the AlTi and WTi coatings. The AlTi coating experiences aluminum depletion, whereas the WTi coating shows accumulations of tungsten oxides that resemble pitting. Full article
(This article belongs to the Special Issue Advances in Titanium and Titanium Alloys)
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14 pages, 57185 KiB  
Article
Effect of Carbon Content on the Phase Composition, Microstructure and Mechanical Properties of the TiC Layer Formed in Hot-Pressed Titanium-Steel Composites
by Marius Grad, Jan Zentgraf, Ulrich Schultheiss, Lukas Esper, Andreas Diemar, Ulf Noster and Lothar Spiess
Metals 2024, 14(9), 959; https://doi.org/10.3390/met14090959 - 24 Aug 2024
Cited by 2 | Viewed by 1269
Abstract
During the hot pressing of pure titanium and different carbon steels in a temperature range of ϑ = 950–1050 °C, a compound layer up to dL≈10 μm thick is formed at the titanium–steel interface. With a higher carbon [...] Read more.
During the hot pressing of pure titanium and different carbon steels in a temperature range of ϑ = 950–1050 °C, a compound layer up to dL≈10 μm thick is formed at the titanium–steel interface. With a higher carbon content of the used steel, the layer thickness increases. The carbon concentration within the layer is in the range of stoichiometry for TiC. Apart from TiC, no other phases can be detected by X-ray diffraction (XRD) measurements inside the formed layer. The calculation of the activation energy for the TiC layer formation is Q = 126.5–136.7 kJ mol−1 and is independent of the carbon content of the steel. The resulting microstructure has a grain size gradient, wherein the mechanical properties, such as hardness and Young‘s modulus, are almost constant. Statistical analysis using Response Surface Methodology (RSM) indicates that the carbon content of the steel has the most significant influence on layer thickness, followed by annealing temperature and annealing time. By selecting the appropriate carbon steel and the subsequent removal of the steel, it is possible to produce targeted TiC layers on titanium substrates, which holds enormous potential for this material in wear-intensive applications. Full article
(This article belongs to the Special Issue Advances in Titanium and Titanium Alloys)
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Graphical abstract

12 pages, 3878 KiB  
Article
Microstructure and Mechanical Properties Ultrasonic Assistance Laser Welded Joints of Beta Titanium Alloy with Multiple Vibrators
by Shiyu Wang, Peng Dong, Fei Chai, Linshan Gao, Shuzhi Zhang and Changjiang Zhang
Metals 2024, 14(4), 422; https://doi.org/10.3390/met14040422 - 3 Apr 2024
Viewed by 3795
Abstract
Aiming at the problem of deterioration of the properties of beta titanium alloy welded joints due to many porosity defects and coarse grains, multi-vibrator ultrasonic-assisted laser welding (M—ULW) technology was used to improve the structure and properties of beta titanium alloy welded joints. [...] Read more.
Aiming at the problem of deterioration of the properties of beta titanium alloy welded joints due to many porosity defects and coarse grains, multi-vibrator ultrasonic-assisted laser welding (M—ULW) technology was used to improve the structure and properties of beta titanium alloy welded joints. The microstructure evolution, tensile strength, elongation, and fracture behavior of the weld joint were studied through scanning electron microscopy, electron back-scatter diffraction, and a universal testing machine. The results show that ultrasonic vibration has no effect on the phase composition of titanium alloy welds during ultrasonic-assisted laser welding. However, it caused all grains in the weld to be transformed into equiaxed grains, and the higher the amplitude, the finer and more uniformly distributed were the equiaxed grains. When the ultrasonic amplitude reached 20 μm, the fine equiaxed crystals were uniformly distributed throughout the weld, and the average grain size of the weld was 56.15 um, which is only one-third of that of the unultrasonicated laser welded joint. Ultrasonic refinement makes the joint grain size decrease, weakens the beta titanium alloy {200} direction weaving, increases the dislocation density within the weld; and increases the tensile strength of the welded joint. The tensile strength of the welded joints exceeded that of the base material by 907 MPa, and the elongation was significantly increased by a factor of 1.8 compared with that of the un-ultrasonicated laser welded joints, resulting in a shift of the fracture location from the center of the weld to the heat-affected zone. Full article
(This article belongs to the Special Issue Advances in Titanium and Titanium Alloys)
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