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Metals
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Microstructure and Mechanical Properties of Titanium Alloys II
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Microstructure and Mechanical Properties of Titanium Alloys II

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

Deadline for manuscript submissions: closed (31 January 2023) | Viewed by 6504

Special Issue Editor

Prof. Dr. Artur Shugurov

E-Mail Website
Guest Editor
Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, 634055 Tomsk, Russia
Interests: titanium alloys; thin films and coatings; mechanical properties; scratch testing; nanoindentation; surfaces and interfaces
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Titanium and its alloys are widely used engineering materials within the aerospace, automotive, energy, and chemical industries. Their unique combinations of high strength-to-weight ratio, strong resistance to creep, excellent corrosion resistance, and low heat conductivity make them suitable for a wide range of applications. A large variety of microstructures, including lamellar, martensite, equiaxed globular, and bimodal (duplex) microstructures, can be obtained in titanium alloys depending on the thermomechanical processing routes. Despite a large amount of work in the field of investigation of microstructure evolution and mechanical properties of titanium alloys, detailed studies of the effect of their microstructure on mechanical behavior are still necessary because of ever-increasing demands for structural materials to optimize their properties for different applications by varying processing parameters and resulting microstructures.

This Special Issue continues the comprehensive presentation of the results concerned with various aspects of microstructure evolution in titanium alloys obtained using traditional and additive technologies and subjected to different processing techniques, and the relation between their microstructure and mechanical behavior, which was initiated in Volume I. The Special issue is focused on manufacturing titanium alloys, experimental characterization, and computer simulation of the evolution of their microstructure and mechanical properties under different processing and loading conditions. Reviews and original articles are welcomed.

Prof. Dr. Artur Shugurov
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

  • titanium alloys
  • microstructure
  • plastic deformation
  • phase transformations
  • mechanical properties
  • computer simulation

Related Special Issue

Published Papers (3 papers)

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Research

14 pages, 10478 KiB  
Article
Microstructure and Superplastic Behavior of Ni-Modified Ti-Al-Mo-V Alloys
by Anton D. Kotov, Maria N. Postnikova, Ahmed O. Mosleh, Vladimir V. Cheverikin and Anastasia V. Mikhaylovskaya
Metals 2022, 12(5), 741; https://doi.org/10.3390/met12050741 - 27 Apr 2022
Cited by 6 | Viewed by 1763
Abstract
The paper studies the influence of 0.5–1.8 wt.% Ni alloying on the superplasticity, microstructural evolution, and dynamic grain growth effect in a temperature range of 625–775 °C and room temperature mechanical properties of two-phase Ti-Al-Mo-V alloys. Due to a decrease in β transus [...] Read more.
The paper studies the influence of 0.5–1.8 wt.% Ni alloying on the superplasticity, microstructural evolution, and dynamic grain growth effect in a temperature range of 625–775 °C and room temperature mechanical properties of two-phase Ti-Al-Mo-V alloys. Due to a decrease in β transus and an enhancement in the alloy diffusivity, an increase in Ni content significantly improved superplasticity. The Ni-modified alloys exhibited 1.5–3-fold lower flow stress, a 2.5–3-fold greater elongation to failure, and 1.4–1.7-fold higher strain rate sensitivity m coefficient compared to the Ni-free alloy. An intermetallic Ti2Ni compound precipitated in the 1.8 wt.% Ni-modified alloy during low-temperature deformation at 700 °C and decreased superplastic properties. The Ti-4Al-3Mo-1V-0.1B alloy with 0.9 wt.% Ni exhibited a good combination of the superplastic behavior and room-temperature mechanical properties: an elongation to failure of 500–900% at a low-temperature range of 625–775 °C and constant strain rate of 1 × 10−3 s−1 and a yield strength of 885 MPa and ultimate tensile strength of 1020 MPa after pre-straining for 100% in a superplastic regime and strengthening heat treatment. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Titanium Alloys II)
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12 pages, 3700 KiB  
Article
Deformation Behavior of Wrought and EBAM Ti-6Al-4V under Scratch Testing
by Artur Shugurov, Alexey Panin, Marina Kazachenok, Lyudmila Kazantseva, Sergey Martynov, Alexander Bakulin and Svetlana Kulkova
Metals 2021, 11(11), 1882; https://doi.org/10.3390/met11111882 - 22 Nov 2021
Cited by 8 | Viewed by 1827
Abstract
The microstructure, mechanical properties, and deformation behavior of wrought and electron beam additive manufactured (EBAM) Ti-6Al-4V samples under scratching were studied. As-received wrought Ti-6Al-4V was subjected to thermal treatment to obtain the samples with microstructure and mechanical characteristics similar to those of the [...] Read more.
The microstructure, mechanical properties, and deformation behavior of wrought and electron beam additive manufactured (EBAM) Ti-6Al-4V samples under scratching were studied. As-received wrought Ti-6Al-4V was subjected to thermal treatment to obtain the samples with microstructure and mechanical characteristics similar to those of the EBAM samples. As a result, both alloys consisted of colonies of α phase laths within prior β phase grains and were characterized by close values of hardness. At the same time, the Young’s modulus of the EBAM samples determined by nanoindentation was lower compared with the wrought samples. It was found that despite the same hardness, the scratch depth of the EBAM samples under loading was substantially smaller than that of the wrought alloy. A mechanism was proposed, which associated the smaller scratch depth of EBAM Ti-6Al-4V with α′→α″ phase transformations that occurred in the contact area during scratching. Ab initio calculations of the atomic structure of V-doped Ti crystallites containing α or α″ phases of titanium were carried out to support the proposed mechanism. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Titanium Alloys II)
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15 pages, 6267 KiB  
Article
Effects of Water Cooling on the Microstructure of Electron Beam Additive-Manufactured Ti-6Al-4V
by Alexey Panin, Sergey Martynov, Marina Kazachenok, Lyudmila Kazantseva, Alexander Bakulin, Svetlana Kulkova, Olga Perevalova and Elena Sklyarova
Metals 2021, 11(11), 1742; https://doi.org/10.3390/met11111742 - 30 Oct 2021
Cited by 14 | Viewed by 2034
Abstract
The inferior mechanical properties of EBAM Ti-6Al-4V samples are due to the coarse columnar grains containing coarse lamellar structures. One can expect that water cooling of the build platform will increase the cooling rate of the molten pool during the build-up process, causing [...] Read more.
The inferior mechanical properties of EBAM Ti-6Al-4V samples are due to the coarse columnar grains containing coarse lamellar structures. One can expect that water cooling of the build platform will increase the cooling rate of the molten pool during the build-up process, causing microstructure refinement. In the present work, the substrate cooling effects on the microstructure and phase composition of EBAM Ti-6Al-4V samples are studied using optical, scanning electron, and scanning transmission microscopy, as well as X-ray diffraction analysis. It is shown that the microstructure of the EBAM Ti-6Al-4V samples built on the substrate without water cooling consists predominantly of columnar prior β grains with lateral sizes ranging up to 2000 µm, while cooling of the build platform causes the appearance of equiaxed prior β grains measuring 1000 µm. Moreover, the refinement of the martensite structure and the precipitation of α′′ martensite platelets within α laths occur in the EBAM Ti-6Al-4V samples built on the water-cooled build platform. An explanation of the mechanisms underlying the α′→α + β and α′→α + α′′ + β transformations during the building process is provided based upon ab initio calculations. The fragmentation of the α laths under the residual compressive stresses is discussed. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Titanium Alloys II)
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