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Metals
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Microstructure and Mechanical Properties of Nickel-Based Superalloy and Titanium Alloy
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Microstructure and Mechanical Properties of Nickel-Based Superalloy and Titanium Alloy

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Structural Integrity of Metals".

Deadline for manuscript submissions: closed (31 January 2022) | Viewed by 5901

Special Issue Editor

Prof. Dr. Bin Tang

E-Mail Website
Guest Editor
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
Interests: titanium alloys; TiAl alloys; nickel-based superalloy; phase transformation; mechanical properties; deformation behavior; microstructure; aerospace applications

Special Issue Information

Dear Colleagues,

Nickel-based superalloys and titanium alloys are widely used to fabricate key components for aerospace and aeroengines. With the increase in the requirements regarding performance and temperature, a significant amount of attention has been given to alloy design and microstructure control for nickel-based superalloys and titanium alloys. With the aim to encourage the application of the latest research findings in the field of aerospace and aeroengines, this Special Issue mainly focuses on microstructure control (including phase transformation mechanism, texture evolution, recrystallization, etc.) during thermal manufacturing (hot forging, rolling, extruding, etc.) and serving processes (tension, compression, creep, etc.). Additionally, papers that describe research work on alloy design, such as composition optimization, interstitial element control, and multiscale calculation, are also invited to this issue.

Prof. Dr. Bin Tang
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
  • TiAl alloys
  • nickel-based superalloy
  • phase transformation
  • mechanical properties
  • deformation behavior
  • microstructure
  • aerospace applications

Published Papers (3 papers)

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Research

8 pages, 2258 KiB  
Article
Hot Compression Behavior of a Novel High Entropy Alloy
by Jinna Mei, Tiandong Wu, Na Wei, Fei Xue, Zhen Cai and Xiangyi Xue
Metals 2022, 12(3), 463; https://doi.org/10.3390/met12030463 - 10 Mar 2022
Cited by 3 | Viewed by 1819
Abstract
In this study, the flow behavior of a novel high entropy alloy, (FeNi)67Cr15Mn10Al5Ti3, was investigated through isothermal compression performed at temperature range of 980–1100 °C using strain rates of 0.01 s−1 and [...] Read more.
In this study, the flow behavior of a novel high entropy alloy, (FeNi)67Cr15Mn10Al5Ti3, was investigated through isothermal compression performed at temperature range of 980–1100 °C using strain rates of 0.01 s−1 and 0.1 s−1. The alloy was mainly composed of a face-centered cubic (FCC) phase and a small amount of body-centered cubic (BCC) phase. During deformation, the alloy exhibited typical single-peak type flow curve at all testing conditions. The stress exponent was determined to be ~5.5 with an apparent activation energy of ~426 kJ/mol, which indicated that dislocation creep was the rate-controlling process. Metallurgical inspection revealed that due to the plastic incompatibility of the two phases, the deformation is non-uniform especially at lower temperature and higher strain rate. Continuous dynamic recrystallization (CDRX) intensively occurred in both phases, but the recrystallization seemed to be much easier in the BCC phase. Dense low angle grain boundaries (LAGBs) were produced as a consequence of CDRX. At a lower strain rate, the LAGB ratio was evidently decreased with the increasing temperature. The sub-grain size was sensitive to the deformation parameter especially at a high temperature and low strain rate. A low temperature and high strain rate were beneficial for grain refinement but a much higher straining was required. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Nickel-Based Superalloy and Titanium Alloy)
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16 pages, 3145 KiB  
Article
Effect of Solute Redistribution on Seeding Process of TiAl Alloys with Limited Convection in a Float Zone
by Yi-Long Xiong, Jun Shen and Yu-Jun Du
Metals 2021, 11(10), 1525; https://doi.org/10.3390/met11101525 - 26 Sep 2021
Cited by 1 | Viewed by 1494
Abstract
Two different analytic models, in which convection in the float zone is assumed, are developed to understand the solute redistributions during general seeding and quasi-seeding processes of TiAl alloys, respectively. The results suggest that the solute redistribution plays an important effect in the [...] Read more.
Two different analytic models, in which convection in the float zone is assumed, are developed to understand the solute redistributions during general seeding and quasi-seeding processes of TiAl alloys, respectively. The results suggest that the solute redistribution plays an important effect in the phase selection and microstructural development during the initial stage of seeding processes. In the initial stage of the quasi-seeding process, the interface concentration increases gradually and the solute diffusion boundary forms with the crystal growth of α phase. Correspondingly, a maximum constitutional undercooling with respect to β phase occurs ahead of the solidifying α interface and then decreases gradually. Simultaneously, the position where the maximum constitutional undercooling occurs also moves forward with regard to the interface. While in the initial stage of the general seeding process, the α phase can grow continuously as stable phase when the initial composition of the melt is higher than Al 48.9%. Under the influence of both the constitutional undercooling and Ti5Si3 particles, coarse dendrites form and then are transformed to cellular morphology. Nevertheless, the lamellar microstructure can still be aligned well during the entire seeding process. Besides, it is also found that the thickness of solute diffusion boundary decreases with the increase of convection intensity and thus, the growing interface become more stably correspondingly, which is beneficial to the lamellar alignment of TiAl alloys. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Nickel-Based Superalloy and Titanium Alloy)
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15 pages, 9494 KiB  
Article
Deformation-Induced Grain-Interior α Precipitation and β Texture Evolution during the β-Processed Forging of a Near-β Titanium Alloy
by Tomonori Kitashima, Lingjian Meng and Makoto Watanabe
Metals 2021, 11(9), 1405; https://doi.org/10.3390/met11091405 - 6 Sep 2021
Cited by 1 | Viewed by 1755
Abstract
The effect of grain-interior α precipitation on the β texture evolution of the near-β Ti-6246 alloy during through-transus forging was investigated in two-step sequential forgings. The microstructure and texture were analyzed using scanning electron microscopy, electron-backscatter diffraction, and X-ray diffraction. The previous β [...] Read more.
The effect of grain-interior α precipitation on the β texture evolution of the near-β Ti-6246 alloy during through-transus forging was investigated in two-step sequential forgings. The microstructure and texture were analyzed using scanning electron microscopy, electron-backscatter diffraction, and X-ray diffraction. The previous β forging was performed at 1253 K at 0.01/s, while the subsequent forging in the (α + β) region was conducted at 1073 K at 0.01/s. The forging in the β region facilitated the penetration of the interior α phase into β grains and reduced the formation of grain boundary α. The {001} texture intensity increased during the forging in the single β region. By contrast, the increase in the {001} texture intensity was moderate at a lower temperature (1073 K) because the Schmid factor (SF) value of the {110}<111> slip system drastically decreased, but those of the {112}<111> and {123}<111> slip systems increased before α precipitation. During α precipitation for all β forging ratios, the {110}<111> slip system was activated, resulting in a lowering of the {001} texture intensity. The lower the forging temperature before interior α precipitation under a constant total forging ratio, the more the {001} texture intensity was suppressed in the final β texture, accompanied by interior α precipitation. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Nickel-Based Superalloy and Titanium Alloy)
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