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Crystals
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Microstructure and Mechanical Properties of Alloys and Composites
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Microstructure and Mechanical Properties of Alloys and Composites

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: 22 September 2025 | Viewed by 740

Special Issue Editors

Dr. Qingchun Zhu

E-Mail Website
Guest Editor
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
Interests: TEM; nickel-based alloys; magnesium; welding; materials design
Dr. Nikolai Zarkevich

E-Mail Website
Guest Editor
Department of Energy, Ames Laboratory, Ames, IA 50011, USA
Interests: alloy thermodynamics; guided design of advanced alloys
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The dependence of microstructures on chemical composition and materials processing affects the performance of structural components. Knowledge of the structure–property relations in alloys and composites allows for the improvement of performance by changing structures, which is affected by composition and processing. The development of novel lightweight structural materials leads to significant progress in transportation and aerospace technologies. Metallic alloys and composites are broadly used in industry. As structural materials, they are utilized for construction. This Special Issue focuses on the microstructure, mechanical and thermal properties, the change in properties with time due to corrosion and aging, performance during the life cycle, and the fabrication and recycling of structural alloys and composite materials, as well as their diverse applications.

Dr. Qingchun Zhu
Dr. Nikolai Zarkevich
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. Crystals 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 2100 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

  • mechanical properties
  • microstructure
  • alloying elements
  • alloys
  • composite materials

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Published Papers (2 papers)

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Research

14 pages, 10839 KiB  
Article
Microstructural Stability and Creep Behavior of a Re/Ru Single-Crystal Nickel-Based Alloy
by Ning Tian
Crystals 2025, 15(4), 370; https://doi.org/10.3390/cryst15040370 - 17 Apr 2025
Viewed by 173
Abstract
By testing the creep properties of a Re/Ru-containing single-crystal alloy specimen and examining the microstructural evolution of the allow at different stages of creep using scanning electron microscopy (SEM) and transmission electron microscopy (TEM), the deformation and damage mechanisms of the alloy under [...] Read more.
By testing the creep properties of a Re/Ru-containing single-crystal alloy specimen and examining the microstructural evolution of the allow at different stages of creep using scanning electron microscopy (SEM) and transmission electron microscopy (TEM), the deformation and damage mechanisms of the alloy under ultra-high temperature conditions were investigated. It was observed that a dislocation network forms before the rafting of the γ′ phase. As creep progresses, this network becomes increasingly dense and complete. Moreover, the dislocation network undergoes a transformation from the <110>-type to the <100>-type configuration, with a hybrid <110>-<100>-type network representing an intermediate state during the transition. Stacking faults were also identified within the γ′ phase, suggesting that the stacking fault energy of this alloy is lower compared to that of other alloys. During creep, dislocations that penetrate the γ′ phase can undergo cross slip from the {111} plane to the {100} plane under applied stress, resulting in the formation of Kear–Wilsdorf (K–W) immobile dislocation locks. These locks hinder further dislocation movement within the γ′ phase. It is concluded that the damage mechanism of the alloy at the later stage of creep under 120 MPa/1160 °C involves initial crack formation at the interface of the twisted raft-like γ/γ′ two-phase structure. As creep continues, the crack propagates in a direction perpendicular to the applied stress axis. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Alloys and Composites)
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21 pages, 17365 KiB  
Article
Regulating the Mechanical and Corrosion Properties of Mg-2Zn-0.1Y Alloy by Trace SiC with Different Morphologies
by Furong Guo, Kaibo Nie, Kunkun Deng and Yanan Li
Crystals 2025, 15(2), 166; https://doi.org/10.3390/cryst15020166 - 8 Feb 2025
Viewed by 438
Abstract
Traditional magnesium structural materials are used widely due to their light weight; however, their corrosion resistance is poor. In order to address this problem and improve the strength simultaneously, SiCp-, SiCnp-, and SiCnw-reinforced Mg-2Zn-0.1Y (wt. %, MZY alloy) matrix composites (SiC/MZY composites) with [...] Read more.
Traditional magnesium structural materials are used widely due to their light weight; however, their corrosion resistance is poor. In order to address this problem and improve the strength simultaneously, SiCp-, SiCnp-, and SiCnw-reinforced Mg-2Zn-0.1Y (wt. %, MZY alloy) matrix composites (SiC/MZY composites) with the same contents (0.3 wt. %) were prepared and extruded at low temperature in this paper. The effects of SiC morphology on the microstructure, mechanical properties and corrosion resistance of MZY alloy were studied. The results show that the grain size can be refined by adding SiC reinforcement. Compared with the unreinforced MZY alloy, the strengths of the SiC/MZY composites were all improved, with a yield strength of more than 440 MPa and an ultimate tensile strength of more than 450 MPa. However, only the corrosion rate of the composites reinforced by submicron SiCp was improved significantly. The hydrogen evolution corrosion rate (PH) was reduced by 81% relative to the MZY alloy. This can be attributed to the decreased galvanic corrosion pairs, as well as the decreased potential difference between the second phase and the matrix in the SiCp/MZY composite. Additionally, a compact product film on the surface of the SiCp/MZY composite can also protect the matrix. The materials prepared in this study showed excellent strength and high corrosion resistance at relatively low cost, providing valuable insights and design ideas for the development and application of those materials in marine and offshore engineering applications. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Alloys and Composites)
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