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Microstructure and Mechanical Properties of Alloys (2nd Edition)

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Metals and Alloys".

Deadline for manuscript submissions: 20 October 2025 | Viewed by 1440

Special Issue Editor


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Guest Editor
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
Interests: welding and joining; microstructure characterization; titanium alloys; nanomaterials; properties; interface engineering; coating
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Special Issue Information

Dear Colleagues,

It is my pleasure to invite you to submit a manuscript to the Special Issue “Microstructure and Mechanical Properties of Alloys” of Materials.

Metal alloys are widely used in industrial products, and their microstructure and mechanical properties directly affect the performance of products. During the whole life cycle of a metal product, its microstructure and mechanical properties will undergo multiple stages of evolution. Firstly, the preparation of alloys, including metallurgy, casting, and rolling, determines the initial properties of alloys. Afterward, alloys will undergo welding, joining, or machining processes in order to manufacture metal products, which will also affect the microstructure and mechanical properties of alloys. Finally, during the service process of metal products, they will experience high-temperature, -oxidation, or -corrosion environments, which will affect the microstructure and mechanical properties of alloys to varying degrees. It is crucial to study the microstructure and properties of alloys in the whole life cycle to promote the development and application of alloys.

The aim of this Special Issue is to provide an updated outlook on the microstructure and mechanical properties of alloys at various stages, including the preparation, processing, and service stages. The correspondence between alloy microstructures and mechanical properties especially needs to be established. These papers can help resolve and understand the evolution of properties of alloy products at different stages. This will help to adjust and design the microstructure and mechanical properties of alloys throughout the whole life cycle.

This Special Issue represents a good opportunity for researchers around the world to disseminate different aspects of their work and report the results related to this topic.

Research articles, review articles, and communications are invited for submission to this Special Issue.

Dr. Xiaoqing Si
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. Materials 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 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

  • microstructure characterization
  • mechanical properties
  • metals and alloys
  • welding and joining
  • improvement of properties
  • machining methods
  • joint strength
  • microstructure evolution
  • corrosion resistance

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Published Papers (2 papers)

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Research

36 pages, 15580 KiB  
Article
The Effect of Sr, Ti, and B on the Crystallization Process and Mechanical Properties of the AlSi9Cu3(Fe) Alloy
by Tomasz Szymczak, Bogusław Pisarek, Cezary Rapiejko, Ryszard Władysiak, Paweł Just, Rafał Kaczorowski, Grzegorz Gumienny, Bartłomiej Januszewicz, Jarosław Piątkowski, Viktor Sinelnikov and Tadeusz Pacyniak
Materials 2025, 18(4), 882; https://doi.org/10.3390/ma18040882 - 17 Feb 2025
Viewed by 378
Abstract
This article presents studies on the effect of Sr and TiB on the crystallization process, mechanical properties, hardness, and density index of the Al-Si alloy from the EN AC-46000 group, with a narrowed chemical composition, produced by die-casting and HPDC (high-pressure die casting) [...] Read more.
This article presents studies on the effect of Sr and TiB on the crystallization process, mechanical properties, hardness, and density index of the Al-Si alloy from the EN AC-46000 group, with a narrowed chemical composition, produced by die-casting and HPDC (high-pressure die casting) technology. The research used the Box–Wilson method to design the experiment and stepwise multiple regression. To identify the optimal amount of Sr and Ti in the analyzed alloy that would simultaneously guarantee the maximization of UTS, YS, Agt, and HBW and the minimization of the DI (density index), multi-criteria optimization was performed. The modifiers were added to the liquid alloy as AlSr10 and AlTi5B1 master alloys. It was found that for 0.02–0.04 wt.% Sr and 0.05–0.08 wt.% Ti in the die castings, the highest mechanical properties, such as UTS, YS, Agt, and HBW (treated as stimulants in the experiment), can be obtained simultaneously with the lowest alloy gasification identified by DI (treated as a destimulant in the experiment). It was also confirmed that the same amount of the above-mentioned elements in HPDC castings caused an increase in UTS by approx. 14%, YS by approx. 6%, A by approx. 47%, and HBW by approx. 13%, with a relatively small increase in DI by approx. 5% compared to the unmodified alloy. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Alloys (2nd Edition))
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21 pages, 8551 KiB  
Article
Microstructure Evolution and Mechanical Properties of 16-Layer 2195 Al-Li Alloy Components Manufactured by Additive Friction Stir Deposition
by Qinglin Liu, Ruilin Lai, Hui Wang, Yidi Li, Yunping Li and Lihua Zhan
Materials 2024, 17(23), 5748; https://doi.org/10.3390/ma17235748 - 24 Nov 2024
Cited by 2 | Viewed by 759
Abstract
The fabrication of multi-layer alloys by additive friction stir deposition (AFSD) results in a complicated microstructure and mechanical property evolution due to the repeated thermal inputs impacting the existing deposited layers. This work systematically studied the microstructure and mechanical properties of several areas [...] Read more.
The fabrication of multi-layer alloys by additive friction stir deposition (AFSD) results in a complicated microstructure and mechanical property evolution due to the repeated thermal inputs impacting the existing deposited layers. This work systematically studied the microstructure and mechanical properties of several areas (last layers, intermediate layers, and first layers) of a 16-layer 2195 alloy component fabricated by AFSD to ascertain the effect of repeated thermal cycling. The periodic heat input resulted in the minimal quantities of T1-phase only appearing in the last layers of the sample, while the θ′-phase developed a complex precipitate with the δ′ and β′ phases. The mechanical properties of the 2195 sample exhibit a gradient development related to the microstructure, with a decrease in strength and hardness from top to bottom. The samples located in the last layers show the highest microhardness of 117.0 Hv, yield strength of 296.6 MPa, ultimate tensile strength of 440.6 MPa, and elongation of 27.1%, respectively. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Alloys (2nd Edition))
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