Aluminum and Magnesium Alloys and Composites: Forming, Preparation, and Processing

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 (31 May 2022) | Viewed by 6386

Special Issue Editors

National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Interests: Aluminum/Magnesium alloys and their forming technology; metals composites
Special Issues, Collections and Topics in MDPI journals
Department of Mechanical Engineering, Faculty of Engineering, University of Maragheh, Maragheh 83111-55181, Iran
Interests: metal forming; ultrafine grained and nanostructure metals and alloys; severe plastic deformation; laminated composites
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In the modern world, the use of light structural materials has become inescapable and avant-garde design strategies directed toward weight reduction (e.g., thin-walled components) are growing in popularity. To this end, aluminum and magnesium having the lightest density in all common structural materials (ρAl = 2.7 g.cm-3, ρMg = 1.7 g.cm-3) are regarded as the most popular lightweight metals, specifically in aviation, the automobile industry, architecture, marine vehicles, and daily life, as their utilization leads to the reduction of vehicle weight and fuel savings. Since these two metals are in a position close to each other in Mendeleev’s periodic table, they also have very similar properties, including atomic weight, strength, melting point, and elasticity. However, they exhibit different crystallographic structures, which explains the fundamental differences in their forming behavior, crystal plastic anisotropy, deformation, and microstructural evolution mechanisms. Unlike aluminum with a face-centered cubic (fcc) structure, the utilization of magnesium in structural components is still limited, mainly because of its restricted ambient temperature formability due to a shortage of independent deformation modes in its hexagonal close-packed (hcp) structure. Aluminum, as the most used metal after steel and magnesium, with very low density (one-third lighter than aluminum) and higher specific strength than aluminum alloys, is profoundly important in industrial applications. Hence, it is of particular significance to improve the properties of Al- and Mg-based alloys and composites by designing new preparation methods, novel post-processing, and forming economical production routes to obtain high-performance materials and expand the applications of these alloys in the industry.

Various methods have been reported for the preparation of Al- and Mg-based alloys and composites with their own benefits and shortcomings. In addition, many post-processing, thermal, and deformation-based technologies and coating strategies were applied to these alloys to improve their properties and enhance performance. In this regard, the present issue aims to thoroughly discuss Al and Mg alloys and composites from the aspect of preparation methods, processing, forming, and related properties. It is hoped that the results of this upcoming issue will lead to major changes in the deeper understanding and expansion of the use of these alloys and composites in industry and pave the way toward the production of high-efficiency components for many researchers and professionals.

Prof. Dr. Qudong Wang
Prof. Dr. Mahmoud Ebrahimi
Guest Editors

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Keywords

  • aluminum alloys
  • magnesium alloys
  • composites
  • casting
  • metal-forming
  • preparation
  • processing
  • grain refinements
  • microstructure characterization
  • mechanical properties

Published Papers (3 papers)

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Research

17 pages, 4072 KiB  
Article
Cyclic Extrusion Compression Process for Achieving Ultrafine-Grained 5052 Aluminum Alloy with Eminent Strength and Wear Resistance
Metals 2022, 12(10), 1627; https://doi.org/10.3390/met12101627 - 28 Sep 2022
Cited by 6 | Viewed by 1366
Abstract
Previous studies have yet to show a consistent effect of severe plastic deformation (SPD) processing on the wear behavior of different metals and alloys. To fill this scientific gap, this study investigated the effect of the cyclic extrusion compression (CEC) process, as one [...] Read more.
Previous studies have yet to show a consistent effect of severe plastic deformation (SPD) processing on the wear behavior of different metals and alloys. To fill this scientific gap, this study investigated the effect of the cyclic extrusion compression (CEC) process, as one of the prominent SPD techniques, on the wear behavior of AA5052. In addition, the microstructure evolution and mechanical properties of the sample before and after the process were experimentally examined and studied. It was found that the yield and ultimate tensile strength of the AA5052 improved significantly after the first pass, while the elongation-to-failure decreased considerably. Further, the subsequent passes mildly changed the trend of increasing strength and reducing elongation-to-failure. SEM morphology indicated that the ductile mode of the initial annealed alloy changed to a combination of ductile and brittle failure modes, in which the level of the brittle failure mode increased with the addition of passes. TEM observations showed that the grain refinement during the CEC process included the formation of dislocation cell structures, subgrain boundaries, and low-angle grain boundaries, with the subgrain boundaries initially evolving into low-angle grain boundaries and, eventually, due to the imposition of additional plastic strain, into high-angle grain boundaries. Furthermore, the CEC process and its increased number of passes led to a significant improvement in wear resistance due to the enhanced tensile strength achieved through grain refinement. In this regard, the wear mechanism of the initial alloy was a combination of adhesion and delamination, with the plastic deformation bands changing to plowing bands with decreased adhesive wear during the process. Eventually, oxidization was found to be a mechanism contributing to wear under all conditions. Full article
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17 pages, 10709 KiB  
Article
Finite Element Analysis of Fluid–Structure Interaction in a Model of an L-Type Mg Alloy Stent-Stenosed Coronary Artery System
Metals 2022, 12(7), 1176; https://doi.org/10.3390/met12071176 - 11 Jul 2022
Cited by 1 | Viewed by 1538
Abstract
The coronary stent deployment and subsequent service process is a complex geometric/physical nonlinear and fluid–structure coupling system. Analyzing the distribution of stress–strain on the stent is of great significance in studying the deformation and failure behavior. A coupled system dynamics model comprising stenotic [...] Read more.
The coronary stent deployment and subsequent service process is a complex geometric/physical nonlinear and fluid–structure coupling system. Analyzing the distribution of stress–strain on the stent is of great significance in studying the deformation and failure behavior. A coupled system dynamics model comprising stenotic coronary artery vessels and L-type Mg alloy stents was established by applying the polynomial hyperelastic constitutive theory. The nonlinear, significant deformation behavior of the stent was systematically studied. The stress–strain distribution of the coupling system during stent deployment was analyzed. The simulation results show that the edges of the supporting body fixed without a bridge are the weakest zone. The stress changes on the inside of the wave of the supporting body are very large, and the residual stress accumulated in this area is the highest. The peak stress of the plaque and the arterial wall was lower than the damage threshold. The velocity of the blood between the wave crest of the supporting body is large and the streamline distribution is concentrated. In addition, the inner surface pressure on the stent is evenly distributed along its axial dimension. The maximum arterial wall shear stress always appears on the inside of the wave crest of the supporting body fixed with a bridge, and, as such, the largest obstacle to the blood flow is in this zone. Full article
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11 pages, 2353 KiB  
Article
The Effect of Tin Content on the Strength of a Carbon Fiber/Al-Sn-Matrix Composite Wire
Metals 2021, 11(12), 2057; https://doi.org/10.3390/met11122057 - 19 Dec 2021
Cited by 7 | Viewed by 2606
Abstract
The effect of tin content in an Al-Sn alloy in the range from 0 to 100 at.% on its mechanical properties was studied. An increase in the tin content leads to a monotonic decrease in the microhardness and conditional yield stress of the [...] Read more.
The effect of tin content in an Al-Sn alloy in the range from 0 to 100 at.% on its mechanical properties was studied. An increase in the tin content leads to a monotonic decrease in the microhardness and conditional yield stress of the Al-Sn alloy from 305 to 63 MPa and from 32 to 5 MPa, respectively. In addition, Young’s modulus and the shear modulus of the Al-Sn alloy decreases from 65 to 52 GPa and from 24 to 20 GPa, respectively. The effect of tin content in the Al-Sn matrix alloy in the range from 0 to 50 at.% on the strength of a carbon fiber/aluminum-tin-matrix (CF/Al-Sn) composite wire subject to three-point bending was also investigated. Increasing tin content up to 50 at.% leads to a linear increase in the composite wire strength from 1450 to 2365 MPa, which is due to an increase in the effective fiber strength from 65 to 89 at.%. The addition of tin up to 50 at.% to the matrix alloy leads to the formation of weak boundaries between the matrix and the fiber. An increase in the composite wire strength is accompanied by an increase in the average length of the fibers pulled out at the fracture surface. A qualitative model of the relationship between the above parameters is proposed. Full article
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