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Metals
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High-Strength Alloys
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High-Strength Alloys

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 April 2022) | Viewed by 7815

Special Issue Editor

Dr. Kyou-Hyun Kim

E-Mail Website
Guest Editor
Korea Institute of Industrial Technology
Interests: Al alloys; structural investigation; transmission electron microscopy

Special Issue Information

Dear Colleagues,

High strength alloys have been widely discovered for the industrial applications in various industrial fields. Conventional high strength alloys are in general important to design a component which resists any external force. In recent decades, however, the high strength alloys with light weight are significantly considered to design many parts to satisfy industrial, environmental, and legal requirements.

This special issue on "High-Strength Alloys" aims to collect recent progresses in the related fields in order to provide great chance to exchange interdisciplinary researches and to promote the development of high strength alloys. The interesting fields are then as follow;

  • Alloy design for high strength alloys
  • Material properties
  • Light metals
  • Processing development
  • Structural investigation
  • Computational modeling and numerical simulation

but are not necessarily limited to the above topics.

Dr. Kyou-Hyun Kim
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

  • Light metals
  • Structural materials
  • High strength alloys
  • Alloy design
  • Structural investigation

Published Papers (4 papers)

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Research

10 pages, 4432 KiB  
Article
Optimization of a Solution Treatment in the Al-Cu-Mg-Ag Alloy via a Microstructural Investigation
by Hyeongsub So, Jae-Hong Shin, Leeseung Kang, Chanuk Jeong and Kyou-Hyun Kim
Metals 2022, 12(1), 66; https://doi.org/10.3390/met12010066 - 29 Dec 2021
Viewed by 1531
Abstract
We investigated the effect of solution temperature (Tsol. = 440–530 °C) on the mechanical properties of the Al–3.4Cu–0.34Mg–0.3Mn–0.17Ag alloy, finding that the investigated Al alloy showed the highest mechanical strength of σUTS = ~329 MPa at a Tsol. value [...] Read more.
We investigated the effect of solution temperature (Tsol. = 440–530 °C) on the mechanical properties of the Al–3.4Cu–0.34Mg–0.3Mn–0.17Ag alloy, finding that the investigated Al alloy showed the highest mechanical strength of σUTS = ~329 MPa at a Tsol. value of 470 °C. The microstructural investigation demonstrates that the mechanical properties for different Tsol. values stem from grain growth, precipitation hardening, and the formation of large particles at the grain boundaries. On the basis of Tsol. = 470 °C, the effect of each microstructural evolution is significantly different on the mechanical properties. In this study, the relationships between the microstructural evolution and the mechanical properties were investigated with respect to different values of Tsol. Full article
(This article belongs to the Special Issue High-Strength Alloys)
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9 pages, 5143 KiB  
Article
Natural Aging Effect of Al-20Zn-3Cu Alloy on Mechanical Properties and Its Relation to Microstructural Change
by Min-Jung Park, Hyeongsub So, Kyou-Hyun Kim, Jai-Won Byeon and Leeseung Kang
Metals 2021, 11(9), 1485; https://doi.org/10.3390/met11091485 - 18 Sep 2021
Cited by 1 | Viewed by 1499
Abstract
We investigate the effect of the natural age-hardening response of the Al-20Zn-3Cu alloy with natural aging times up to 12 months. The ultimate tensile strength of the Al-20Zn-3Cu alloy is drastically enhanced from 308 to 320 MPa after 2 months and from 320 [...] Read more.
We investigate the effect of the natural age-hardening response of the Al-20Zn-3Cu alloy with natural aging times up to 12 months. The ultimate tensile strength of the Al-20Zn-3Cu alloy is drastically enhanced from 308 to 320 MPa after 2 months and from 320 to 346 MPa after 9 months. Then, natural age hardening becomes saturated after 9 months. A microstructural investigation reveals that the natural age-hardening mechanism is mainly induced by the diffusion of the Zn element. First, a rapid decrease in the volume fraction of the eutectoid lamellae (α-Al+η-Zn) is observed at the early stage of natural aging, leading to an increase in the tensile strength. This originates from the relatively high diffusivity of Zn due to its low melting temperature. Then, the diffusion of Zn into the Al matrix induces clusters of solute atoms that enhance the growth rate of the nanoprecipitates formed in the Al matrix. As a consequence, the tensile strength of the natural-aged Al-20Zn-3Cu alloy increases drastically after 9 months, whereas the ductility is significantly degraded. Full article
(This article belongs to the Special Issue High-Strength Alloys)
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9 pages, 4706 KiB  
Article
Influence of Sc Microalloying on the Microstructure of Al5083 Alloy and Its Strengthening Effect
by Ji-Hoon Park, Kee-Ahn Lee, Sung-Jae Won, Yong-Bum Kwon and Kyou-Hyun Kim
Metals 2021, 11(7), 1120; https://doi.org/10.3390/met11071120 - 14 Jul 2021
Cited by 1 | Viewed by 1878
Abstract
In this study, we investigate the influence of Sc microalloying on the microstructure of the Al5083 alloy. Trace amounts of Sc addition drastically improve the mechanical properties of the Al5083 alloy from 216 MPa to 233 MPa. Macroscopically, the addition of Sc significantly [...] Read more.
In this study, we investigate the influence of Sc microalloying on the microstructure of the Al5083 alloy. Trace amounts of Sc addition drastically improve the mechanical properties of the Al5083 alloy from 216 MPa to 233 MPa. Macroscopically, the addition of Sc significantly reduces the grain size of Al by approximately 50%. Additionally, a microstructural investigation reveals that the Sc microalloying element induces fine Al3Sc nanoprecipitates in the Al matrix. The formation of Al3Sc nanoprecipitates results in a pinning effect on the dislocations, leading to accumulated dislocations. Compared to a Sc-free Al5083 alloy specimen, the number density of dislocations in the Sc-added Al5083 alloy significantly increases after hot rolling, enhancing the tensile properties. We reveal that the improved mechanical properties of Al5083 with Sc microalloying originate from the grain refinement and the formation of fine Al3Sc nanoprecipitates. Full article
(This article belongs to the Special Issue High-Strength Alloys)
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22 pages, 12493 KiB  
Article
Influence of Oxidation Processing Temperature on the Structure, Mechanical and Tribological Properties of Titanium Using Carbon Sheets
by Tong Chen, Shinji Koyama, Shinichi Nishida and Lihua Yu
Metals 2021, 11(4), 585; https://doi.org/10.3390/met11040585 - 03 Apr 2021
Cited by 4 | Viewed by 1812
Abstract
Surface processing of pure titanium was performed using a carbon sheet to increase the surface hardness and improve tribological property. The effect of processing temperature (750–950 °C) for 2 h on the structure, mechanical and room-temperature tribological properties of the treated samples was [...] Read more.
Surface processing of pure titanium was performed using a carbon sheet to increase the surface hardness and improve tribological property. The effect of processing temperature (750–950 °C) for 2 h on the structure, mechanical and room-temperature tribological properties of the treated samples was investigated using X-ray diffraction, scanning electron microscopy, and ball-on-disk tribometry, respectively. The Gibbs free energy was also calculated to evaluate the compounds generated at different processing temperatures. As a result of the examination, the hardened layer was mainly composed of titanium oxide and titanium carbide. With the increasing processing temperatures, the thickness of the hardened layer increased first and then decreased gradually. It was also revealed that the surface hardness was increased first and then decreased as the processing temperature increased. The fricative value of the treated samples showed a minimum value of 84.1 dB for a processing temperature of 850 °C. The depth and width of the wear tracks increased first and then decreased gradually with the increasing processing temperatures. The worn surface of the treated samples at higher temperatures showed a very good wear resistance. A processing temperature at 850 °C is considered optimal as it provides sufficiently high hardness and a low coefficient of friction to reduce fricative during practical use. Full article
(This article belongs to the Special Issue High-Strength Alloys)
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