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Metals
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Advances in TiAl Alloys: Structures, Properties and Applications
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Advances in TiAl Alloys: Structures, Properties and Applications

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

Deadline for manuscript submissions: closed (1 July 2023) | Viewed by 1587

Special Issue Editors

Prof. Dr. Hao Wang

E-Mail Website
Guest Editor
School of Materials and Chemistry/Interdisciplinary Center for Additive Manufacturing, University of Shanghai for Science and Technology, Shanghai, China
Interests: materials genome; advanced materials; additive manufacturing
Special Issues, Collections and Topics in MDPI journals
Dr. Shoujiang Qu

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
Interests: TiAl-based alloys; Ti2AlNb-based alloy; 3D printing titanium alloys; oxidation resistance
Dr. Hao Wang

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Shanghai University, 99 Shangda Road, BaoShan District, Shanghai 200444, China
Interests: integrated computational materials engineering; materials genome; DFT; MD

Special Issue Information

Dear Colleagues,

Following decades of intensive investigations, TiAl alloys consisting mostly of titanium aluminium binary intermetallic compounds have found industrial applications due to their low density, good strength, and creep properties as well as good oxidation and burn resistance, in particular in aero-engines. GE and Rolls-Royce have used Ti4822 and Ti45xd, respectively, to fabricate low-pressure turbine blades in their commercial engines GEnx and Trend XWB. Nevertheless, researchers are still working on improving the overall performance of TiAl alloys through the optimization of composition (adding Nb, Mo, etc.), microstructure (PST single crystals), processing (additive manufacturing), etc.

In this Special Issue, research on recent advances in the modeling, characterization, fabrication, oxidation resistance, and applications of TiAl alloys is welcome.

Prof. Dr. Hao Wang
Dr. Shoujiang Qu
Dr. Hao Wang
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

  • TiAl alloys
  • modeling
  • characterization
  • fabrication
  • oxidation resistance
  • applications

Published Papers (1 paper)

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Research

13 pages, 5838 KiB  
Article
Effect of Microstructure on Impact Resistance and Machinability of TiAl Alloys for Jet Engine Turbine Blade Applications
by Toshimitsu Tetsui
Metals 2023, 13(7), 1235; https://doi.org/10.3390/met13071235 - 5 Jul 2023
Cited by 3 | Viewed by 1153
Abstract
The impact resistance and machinability of TiAl alloys, which are used for jet engine turbine blades, are critical for ensuring reliability and reducing manufacturing costs. This study investigated the effects of the microstructure on these properties using Ti–Al–Cr ternary alloys via Charpy impact [...] Read more.
The impact resistance and machinability of TiAl alloys, which are used for jet engine turbine blades, are critical for ensuring reliability and reducing manufacturing costs. This study investigated the effects of the microstructure on these properties using Ti–Al–Cr ternary alloys via Charpy impact tests at room temperature and 700 °C and performing cutting tests using a face mill with cemented carbide tools. As a result, it was confirmed that six types of typical microstructures of TiAl alloys, namely, fine FL, coarse FL, L + γ, γ, γ + β, and L + γ + β, could be formed by varying the Al and Cr concentrations and heat-treatment conditions. Impact resistance and machinability are each the exact opposite trends to the other, with coarse FL having the best impact resistance but poor machinability. Meanwhile, γ has the best machinability but the weakest impact resistance. L + γ has no major drawbacks, including creep strength. As the microstructure of TiAl4822, currently used in LEAP (leading edge aviation propulsion) engine blades, is almost a γ single-phase microstructure, we assumed that manufacturers chose this microstructure to improve machinability and thus reduce the cost. However, because the γ microstructure has the lowest impact resistance, caution should be exercised when applying it to other engines with different operating environment. On the other hand, the microstructure containing the β phase is inferior in all aspects, including creep strength. Thus, it is questionable to use TiAl-forged materials with a residual β phase in small-sized products that can be manufactured by casting. Full article
(This article belongs to the Special Issue Advances in TiAl Alloys: Structures, Properties and Applications)
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