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Metals
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Research on Microstructure and Mechanical Properties of Metallic Materials and...
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Research on Microstructure and Mechanical Properties of Metallic Materials and Metal-Matrix Composites

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

Deadline for manuscript submissions: closed (30 April 2022) | Viewed by 9346

Special Issue Editor

Dr. Xian Luo

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
Interests: microstructure characterization; surface treatment of metallic materials; solid phase transformation; metal–matrix composites; coating technology

Special Issue Information

Dear Colleagues,

It is well-known that the microstructures of metals and metal-matrix composites have significant effects on their mechanical properties, while the material constituent, preparation and processing processes determine the microstructures of metals and metal-matrix composites. Therefore, study on the relationship between the microstructure and properties of materials is an eternal topic. This Special Issue will focus on the recent research progress on microstructure and mechanical properties of metallic materials or metal-matrix composites, so as to provide a new insight into the current status and future prospects in this field.

It is my great pleasure to invite everyone to submit a manuscript for this Special Issue. Full papers, communications, or reviews on any aspect of microstructure and mechanical properties of metals and metal-matrix composites are all welcome.

Dr. Xian Luo
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

  • Microstructure evolution
  • Advanced metallic materials
  • Advanced metal-matrix composites
  • Macro/micro mechanical properties
  • Phase transformation

Published Papers (5 papers)

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Research

18 pages, 6285 KiB  
Article
Influence of Supersaturation on Growth Behavior and Mechanical Properties of Polycrystalline 3C-SiC on W Wire Substrate
by Shuai Liu, Xian Luo, Bin Huang and Yanqing Yang
Metals 2022, 12(5), 881; https://doi.org/10.3390/met12050881 - 23 May 2022
Cited by 1 | Viewed by 1601
Abstract
As an important reinforcement for metal matrix composites, the microstructure and mechanical properties of W-core SiC filament have drawn increasing attentions among researchers. In this work, the growth behavior of polycrystalline 3C-SiC on W-wire substrate in the chemical vapor deposition (CVD) process and [...] Read more.
As an important reinforcement for metal matrix composites, the microstructure and mechanical properties of W-core SiC filament have drawn increasing attentions among researchers. In this work, the growth behavior of polycrystalline 3C-SiC on W-wire substrate in the chemical vapor deposition (CVD) process and the evolution of mechanical properties in preparation of W-core SiC filament, were investigated as a function of gas-phase supersaturation. Kinetic studies revealed that the growth of 3C-SiC grains was limited by surface reactions at both 850 °C and 1050 °C, and the deposit experienced similar morphological changes from a porous structure to large clusters, with the increase in supersaturation. Structural analyses and mechanical tests show that the production of pores and the amorphous phase with a low supersaturation, of 9.6 × 107 at 850 °C, resulted in a reduction in the modulus and hardness of the polycrystalline deposits, to 270.3 GPa and 33.9 GPa, while the reduced structural defects (e.g., stacking faults and twins) in highly (111) orientated 3C-SiC grains, as well as the improved surface quality obtained with the medium supersaturation of 1.6 × 107 at 1050 °C, enhanced the tensile strength and the Weibull modulus of W-core SiC filament to 2.88 GPa and 11.2, respectively. During the growth of 3C-SiC grains, the variation in structural defects density is controlled by the critical nucleation energy of the two-dimensional (2D) nucleus. Full article
(This article belongs to the Special Issue Research on Microstructure and Mechanical Properties of Metallic Materials and Metal-Matrix Composites)
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11 pages, 4172 KiB  
Article
Study on SPF/DB Technology for Two-Sheet Hollow Structure of 1420 Al-Li Alloy
by Yaoming Li, Honglin Wang, Tao Niu, Huang Zhang and Meini Yuan
Metals 2022, 12(3), 389; https://doi.org/10.3390/met12030389 - 23 Feb 2022
Cited by 3 | Viewed by 1558
Abstract
The two-sheet hollow structure of the 1420 Al-Li alloy was prepared by the method of superplastic forming and diffusion bonding. The interface combination status of the diffusion bonding region and the microstructure of the superplastic forming region were observed by an optical microscope. [...] Read more.
The two-sheet hollow structure of the 1420 Al-Li alloy was prepared by the method of superplastic forming and diffusion bonding. The interface combination status of the diffusion bonding region and the microstructure of the superplastic forming region were observed by an optical microscope. The thickness distribution of the superplastic forming region was measured by an ultrasonic thickness meter machine, the defect detection was tested by X-ray nondestructive inspection, and the failure modes of the samples were analyzed. The results showed that the two-sheet hollow structure of the 1420 Al-Li alloy was prepared successfully, the structure was integrated, and there were no shape defects such as pit, wrinkle, and collapse. The structure shape was almost attached to the die completely, and the thickness was almost uniform distribution. The no deforming area of the two-sheet hollow structure of the 1420 Al-Li alloy was a long strip, rolled microstructure, while the grains near the round corner area were equiaxed states resulting from dynamic recrystallization. The improper control of the superplastic gas pressure in the forming process would lead to the tearing or the die-attaching failure for the two-sheet hollow structure of the 1420 Al-Li alloy. Full article
(This article belongs to the Special Issue Research on Microstructure and Mechanical Properties of Metallic Materials and Metal-Matrix Composites)
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10 pages, 3895 KiB  
Article
Strain Amplitude Dependence of High Damping Grp/Mg97Zn1Y2 Composites Ranging from Anelastic to Microplastic
by Diqing Wan, Shaoyun Dong, Yinglin Hu, Jiajun Hu, Yandan Xue and Guoliang Han
Metals 2021, 11(10), 1570; https://doi.org/10.3390/met11101570 - 30 Sep 2021
Cited by 2 | Viewed by 1180
Abstract
In this paper, the damping capacities and damping mechanisms of high damping, graphite-reinforced Mg97Zn1Y2 composites were investigated. Composites consisting of different graphite particle sizes (24, 11, and 3 μm) were designed and prepared using the casting method. The microstructure of the composites was [...] Read more.
In this paper, the damping capacities and damping mechanisms of high damping, graphite-reinforced Mg97Zn1Y2 composites were investigated. Composites consisting of different graphite particle sizes (24, 11, and 3 μm) were designed and prepared using the casting method. The microstructure of the composites was examined using optical microscopy (OM) and transmission electron microscopy (TEM), which confirmed that the graphite particles were successfully planted into the Mg97Zn1Y2 matrix. Measurements made with a dynamic mechanical analyzer (DMA) showed that the Grp/Mg97Zn1Y2 composite has a high damping capacity. At the anelastic strain amplitude stage, the damping properties of the Grp/Mg97Zn1Y2 composites were found to be higher than those of the Mg97Zn1Y2 alloy. Furthermore, decreasing the graphite particle size was found to improve the damping properties of the Grp/Mg97Zn1Y2 composites. At the microplastic strain amplitude stage, the damping properties of the Mg97Zn1Y2 alloy were found to be higher than those of the Grp/Mg97Zn1Y2 composites. Moreover, the damping properties of the Grp/Mg97Zn1Y2 composites were found to decrease with increasing graphite particle size. The reason for the increased damping of the Grp/Mg97Zn1Y2 composites during the anelastic strain amplitude stage can be attributed to the increase in the number of damping sources and weak interactions among the dislocation damping mechanisms. At the microplastic strain amplitude stage, the damping properties of the composite are mainly affected by the activation volume of the slipped dislocation. Full article
(This article belongs to the Special Issue Research on Microstructure and Mechanical Properties of Metallic Materials and Metal-Matrix Composites)
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11 pages, 3702 KiB  
Article
Dynamic Mechanical Properties of Ti–Al3Ti–Al Laminated Composites: Experimental and Numerical Investigation
by Jian Ma, Meini Yuan, Lirong Zheng, Zeyuan Wei and Kai Wang
Metals 2021, 11(9), 1489; https://doi.org/10.3390/met11091489 - 19 Sep 2021
Cited by 3 | Viewed by 1930
Abstract
The Ti–Al3Ti–Al laminated composites with different Al contents were prepared by vacuum hot pressing sintering technology. The effects of Al content on the dynamic mechanical properties of the composites were studied using the combination of Split Hopkinson Pressure Bar experiment and finite element [...] Read more.
The Ti–Al3Ti–Al laminated composites with different Al contents were prepared by vacuum hot pressing sintering technology. The effects of Al content on the dynamic mechanical properties of the composites were studied using the combination of Split Hopkinson Pressure Bar experiment and finite element analysis. The results showed that different Al content changes the fracture mode of the composites. The laminated composites without Al have higher brittleness and lower fracture strain. The Ti–Al3Ti–Al laminated composites containing 10–15%Al have better dynamic mechanical properties than those without Al, but the subsequent increase of Al content is not conducive to the improvement of strength. However, when the Al content in the specimen reaches 30%, the dynamic mechanical properties of the composites decrease, multi-crack phenomenon and relatively large strain occur, and the Al extruded from the layers fills the crack. Full article
(This article belongs to the Special Issue Research on Microstructure and Mechanical Properties of Metallic Materials and Metal-Matrix Composites)
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15 pages, 9451 KiB  
Article
Study on the Relationship between High Temperature Mechanical Properties and Precipitates Evolution of 7085 Al Alloy after Long Time Thermal Exposures
by Jinxin Zang, Pan Dai, Yanqing Yang, Shuai Liu, Bin Huang, Jigang Ru and Xian Luo
Metals 2021, 11(9), 1483; https://doi.org/10.3390/met11091483 - 18 Sep 2021
Cited by 4 | Viewed by 2074
Abstract
The requirement for 7085 Al alloy as large airframe parts has been increasing due to its low quenching sensitivity and high strength. However, the relationship between high temperature mechanical properties and the evolution of precipitates in hot environments is still unclear. In this [...] Read more.
The requirement for 7085 Al alloy as large airframe parts has been increasing due to its low quenching sensitivity and high strength. However, the relationship between high temperature mechanical properties and the evolution of precipitates in hot environments is still unclear. In this work, thermal exposure followed by tensile tests were conducted on the 7085 Al alloy at various temperatures (100 °C, 125 °C, 150 °C and 175 °C). Variations of hardness, electrical conductivity and tensile properties were investigated. The evolution of the nano scale precipitates was also quantitatively characterized by transmission electron microscopy (TEM). The results show that the hardness and electrical conductivity of the alloy are more sensitive to the temperature than to the time. The strength decreases continuously with the increase of temperature due to the transformation from η′ to η phase during the process. Furthermore, the main η phase in the alloy transformed from V3 and V4 to V1 and V2 variants when the temperature was 125 °C. Additionally, with increasing the temperature, the average precipitate radius increased, meanwhile the volume fraction and number density of the precipitates decreased. The strengthening effect of nano scale precipitates on tensile properties of the alloy was calculated and analyzed. Full article
(This article belongs to the Special Issue Research on Microstructure and Mechanical Properties of Metallic Materials and Metal-Matrix Composites)
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