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High-Performance Alloys and Their Applications
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High-Performance Alloys and Their Applications

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (20 March 2025) | Viewed by 2241

Special Issue Editors

Prof. Dr. Zhiwei Liu

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, China
Interests: solidification; casting; ultrasound; Al/Mg alloys and their composites; nuclear shielding materials
Special Issues, Collections and Topics in MDPI journals
Dr. Peng Xiao

E-Mail Website
Guest Editor
School of Material Science and Engineering, Xi’an Jiaotong University, Xi'an, China
Interests: metal matrix composites; lightweight alloys; casting; hot process; strength-toughness; corrosion behavior
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

High-performance alloys with high strength, high elastic modulus, high toughness, and excellent physical properties, as well as excellent machinability, continue to hold a significant position in the field of materials. These high-performance alloys are widely utilized as key structural and functional parts in various industries, such as machinery, automotive, aerospace, biomedical, electronic information, and other high-tech fields, and offer distinct advantages in terms of performance–price ratio and boast extensive market potential. The high performance of alloy materials has always been the goal of product application. The past few decades have witnessed remarkable progress in high-performance alloys and their applications in basic theory, new technology principle, novel material design, preparation and forming, and properties. Therefore, it is of great importance to understand the relationship between the preparation, microstructure, and properties of alloys, and it also facilitates the production of products with higher quality so as to meet the requirements of the industry.

This Special Issue aims to publish recent successes and developments regarding the design, preparation, processing, microstructure, properties, and application of high-performance alloys.

Prof. Dr. Zhiwei Liu
Dr. Peng Xiao
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. Applied Sciences is an international peer-reviewed open access semimonthly 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 2400 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

  • metals and alloy
  • solidification
  • sintering
  • refiners
  • plastic deformation
  • heat treatment
  • additive manufacturing
  • corrosion
  • nuclear shielding
  • mechanical behavior
  • functional properties

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Published Papers (2 papers)

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Research

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17 pages, 7044 KiB  
Article
Impact of Delayed Artificial Aging on Tensile Properties and Microstructural Evolution of Directed Energy Deposited Scalmalloy®
by Rachel Boillat-Newport, Sriram Praneeth Isanaka and Frank Liou
Appl. Sci. 2025, 15(7), 3674; https://doi.org/10.3390/app15073674 - 27 Mar 2025
Viewed by 197
Abstract
Scalmalloy® is a novel alloy designed to work with the unique processing inherent in additive manufacturing (AM). This alloy is post-processed using a single artificial aging treatment rather than a multistep heat treatment, as often noted in traditional manufacturing processes. Much of [...] Read more.
Scalmalloy® is a novel alloy designed to work with the unique processing inherent in additive manufacturing (AM). This alloy is post-processed using a single artificial aging treatment rather than a multistep heat treatment, as often noted in traditional manufacturing processes. Much of the literature details the impact of direct aging treatments around the temperature and time recommended by the manufacturer, 325 °C for 4 h; however, few studies have explored the impact of delayed artificial aging on the resulting mechanical and microstructural behavior. This study explored this missing link and determined the impact that the time between the fabrication of the component and artificial aging has on the final properties. For this study, directed energy deposition (DED) was utilized to fabricate Scalmalloy® components. Post-processing via artificial aging was performed after fabrication to yield samples naturally aged for 0, 2, 4, 6, 8, 10, 12, and 14 days. Samples were subsequently aged at 325 °C for 4 h. Tensile testing determined that natural aging negatively impacts tensile strengths. After 6 days of delayed artificial aging (6 NA), the yield strength (YS) and tensile strength (TS) relative to day 0 (0 NA) case were diminished by 10% and 8.6%, respectively. After 12 days (12 NA), even greater property decreases were noted, with a 23% decrease in YS and an 18% decrease in TS. Microstructural characterization was performed and an increase in precipitate size and decrease in precipitate number coupled with increased grain sizes were theorized to be linked to the decrease in tensile properties. The negative impact of delayed artificial aging after AM fabrication for Scalmalloy® highlights the importance of fast transitions from deposition to heat treatment. Full article
(This article belongs to the Special Issue High-Performance Alloys and Their Applications)
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Review

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24 pages, 2222 KiB  
Review
Additive Manufacturing of PH 13-8 Mo Family: A Review
by Gökçe Aydin, Joel Andersson and Maria Asuncion Valiente Bermejo
Appl. Sci. 2024, 14(17), 7572; https://doi.org/10.3390/app14177572 - 27 Aug 2024
Cited by 1 | Viewed by 1553
Abstract
The PH 13-8 Mo family of steels belong to the martensitic precipitation hardening stainless steels (MPHSSs) category, which exhibits a good combination of mechanical properties and corrosion resistance. Additive manufacturing (AM) offers advantages, including reduced material waste and the capability to produce complex, [...] Read more.
The PH 13-8 Mo family of steels belong to the martensitic precipitation hardening stainless steels (MPHSSs) category, which exhibits a good combination of mechanical properties and corrosion resistance. Additive manufacturing (AM) offers advantages, including reduced material waste and the capability to produce complex, near-net-shape parts. Consequently, the application of AM techniques to the PH 13-8 Mo family is being increasingly explored across various industries. This review paper presents the existing literature on the topic and provides an overview. The review starts by presenting information about the PH 13-8 Mo family, including microstructure, chemical compositions, heat treatments, and mechanical properties. Afterwards, the work focuses on presenting the microstructure and resulting properties of PH 13-8 Mo family processed by three different additive manufacturing processes: Powder Bed Fusion using a Laser Beam (PBF-LB), Directed Energy Deposition using an Electric Arc (DED-Arc), and Directed Energy Deposition using a Laser Beam (DED-LB), both in their as-built condition and following post-processing heat treatments. The review concludes with a summary and outlook that highlights existing knowledge gaps and underscores the need for further research to tailor the microstructural evolution and enhance the properties. The findings indicate that AM of the PH 13-8 Mo family has the potential for industrial applications, yet further studies are necessary to optimize its performance. Full article
(This article belongs to the Special Issue High-Performance Alloys and Their Applications)
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