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Metals
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Advances in Titanium Alloys and Manufacturing and Processing Technologies
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Advances in Titanium Alloys and Manufacturing and Processing Technologies

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Casting, Forming and Heat Treatment".

Deadline for manuscript submissions: closed (30 June 2022) | Viewed by 4942

Special Issue Editors

Prof. Dr. Taekyung Lee

E-Mail Website
Guest Editor
School of Mechanical Engineering, Pusan National University, Busan 46241, Republic of Korea
Interests: titanium; manufacturing; electrically assisted; caliber rolling
Dr. Jong-Taek Yeom

E-Mail Website
Guest Editor
Titanium Department, Korea Institute of Materials Science, Changwon 51508, Korea
Interests: titanium and titanium alloys; advanced plastic forming; thermomechanical processing; shape memory; superplastic alloys

Special Issue Information

Dear Colleagues,

Titanium alloys have been used in a variety of important industries including the aerospace, defense, energy plants, petrochemicals, transportation, and biomedical fields and in consumer goods. Such a wide application arises from the high specific strength, excellent corrosion resistance, and biocompatibility of titanium alloys. Nevertheless, titanium alloys have a few drawbacks such as a lack of workability, low room temperature formability, and high costs as compared with steels and aluminum alloys. Many researchers have endeavored to overcome these limitations either by developing a novel alloying system or by optimizing the processing parameters of conventional thermomechanical processes. Furthermore, researchers have focused on various ways of forming titanium alloys including not only traditional methods (e.g., sheet forming, forging, and superplasticity) but also innovative methods (e.g., additive manufacturing, cryogenic forming, and electrically assisted forming).

In this Special Issue, we welcome articles that focus on titanium alloys in terms of their design, smelting, melting, plastic deformation processing, welding and joining, microstructure control technologies to overcome its shortcomings, and especially their innovative manufacturing processes that can both reduce the price of titanium alloys and maximize their properties.

Prof. Dr. Taekyung Lee
Dr. Jong-Taek Yeom
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

  • titanium
  • titanium alloy
  • low cost
  • manufacturing
  • plastic forming
  • welding and joining
  • microstructure control
  • thermomechanical processing
  • additive manufacturing

Published Papers (3 papers)

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Research

12 pages, 3086 KiB  
Article
Twin Boundary Induced Grain Coarsening in Friction Stir Welding of Fine- and Ultra-Fine-Grained Commercially Pure Titanium Base Metals
by Jae-Deuk Kim, Siva Prasad Murugan, Seong-Woo Choi, Yutaka S. Sato, Jae-Keun Hong, Changwook Ji, Chang-Sub Kwak and Yeong-Do Park
Metals 2022, 12(8), 1361; https://doi.org/10.3390/met12081361 - 16 Aug 2022
Viewed by 1198
Abstract
The mechanical properties of commercially pure titanium can further be improved through the grain refinement processes; however, welding fine-grained materials is challenging due to the grain coarsening in the weld area and hence the weakening of the mechanical properties locally. Meanwhile, friction stir [...] Read more.
The mechanical properties of commercially pure titanium can further be improved through the grain refinement processes; however, welding fine-grained materials is challenging due to the grain coarsening in the weld area and hence the weakening of the mechanical properties locally. Meanwhile, friction stir welding is a promising process in which the metallurgical bonding is established through the solid-state mechanical mixing of materials to be welded; no studies have reported friction stir welding of the ultra-fine-grained commercial purity titanium to date. In this research, friction stir welding of fine-grained and ultra-fine-grained commercially pure titanium (1.58 and 0.66 μm, respectively) was conducted. The effect of the microstructural feature of base metals on the microstructural evolution of the stir zone and the feasibility of the friction stir welding process for those materials were discussed. It was found that the fraction of twin boundaries in ultra-fine-grained material was higher than in fine-grained material. It accelerated dynamic recrystallization and recovery in the stir zone, hence inducing the grain coarsening and the loss of ultra-fine-grained structure and character after welding. Full article
(This article belongs to the Special Issue Advances in Titanium Alloys and Manufacturing and Processing Technologies)
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11 pages, 6441 KiB  
Article
Synthesis of Ti-Cu Multiphase Alloy by Spark Plasma Sintering: Mechanical and Corrosion Properties
by Oleg O. Shichalin, Vladimir N. Sakhnevich, Igor Yu. Buravlev, Aleksey O. Lembikov, Anastasia A. Buravleva, Semen A. Azon, Sofia B. Yarusova, Sakhayana N. Danilova, Alexander N. Fedorets, Anton A. Belov and Evgeniy K. Papynov
Metals 2022, 12(7), 1089; https://doi.org/10.3390/met12071089 - 25 Jun 2022
Cited by 8 | Viewed by 1550
Abstract
To study the material based on the binary system Ti + Cu (50% atm), samples were produced from powders of commercially pure metals and additionally ground in a ball mill (final size about 12 µm) by spark plasma sintering. The following intermetallic phases [...] Read more.
To study the material based on the binary system Ti + Cu (50% atm), samples were produced from powders of commercially pure metals and additionally ground in a ball mill (final size about 12 µm) by spark plasma sintering. The following intermetallic phases were obtained in the materials: CuTi2, TiCu, and Ti3Cu4. The materials have a hardness of 363 and 385 HV (800 and 900 °C), a microhardness of 393 and 397 µHV, a density of 4.24 and 5.23 kg/m3, and resistance to corrosion in acids (weight gain + 0.002% after 24 h of testing according to ISO 16151 for a sample with 900 °C—the best result in comparison with steel 308, AA2024, CuA110Fe3Mn2). The hardness value varies due to the presence of pure metal agglomerates. The relationship between the temperature of spark plasma sintering and the characteristics of the material (material parameters improve with increasing temperature, segregation is reduced) is revealed. Full article
(This article belongs to the Special Issue Advances in Titanium Alloys and Manufacturing and Processing Technologies)
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13 pages, 2538 KiB  
Article
Infrared Thermography for Investigation of Surface Quality in Dry Finish Turning of Ti6Al4V
by Manuela De Maddis, Vincenzo Lunetto, Valentino Razza and Pasquale Russo Spena
Metals 2022, 12(1), 154; https://doi.org/10.3390/met12010154 - 14 Jan 2022
Cited by 4 | Viewed by 1589
Abstract
The machining of titanium alloys always raises issues because of their peculiar chemical and physical characteristics as compared to traditional steel or aluminum alloys. A proper selection of parameters and their monitoring during the cutting operation makes it possible to minimize the surface [...] Read more.
The machining of titanium alloys always raises issues because of their peculiar chemical and physical characteristics as compared to traditional steel or aluminum alloys. A proper selection of parameters and their monitoring during the cutting operation makes it possible to minimize the surface roughness and cutting force. In this experimental study, infrared thermography was used as a control parameter of the surface roughness of Ti6A4V in dry finish turning. An analysis of variance was carried out to determine the effect of the main cutting parameters (cutting speed and feed rate) on the surface roughness and cutting temperature. In the examined range of the machining parameters, cutting speed and feed were found to have a primary effect on the surface roughness of the machined parts. Cutting speed also significantly affected the temperature of the cutting region, while feed was of second order. Higher cutting speeds and intermediate feed values gave the best surface roughness. A regression analysis defined some models to relate the cutting temperature and surface roughness to the machining parameters. Infrared thermography demonstrated that the cutting temperature could be related to roughness. Full article
(This article belongs to the Special Issue Advances in Titanium Alloys and Manufacturing and Processing Technologies)
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