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Metals
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Microstructure and Mechanical Properties of Aluminum Alloy and Its Composites...
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Microstructure and Mechanical Properties of Aluminum Alloy and Its Composites by Additive Manufacturing

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

Deadline for manuscript submissions: closed (31 May 2022) | Viewed by 5072

Special Issue Editor

Prof. Dr. Bo Song

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Interests: material and structure optimization design for additive manufacturing; selective laser melting

Special Issue Information

Dear Colleagues,

Aluminum alloys include many kinds of series, which have important application prospects. Metal additive manufacturing has great advantages in forming aluminum alloy parts, because it can realize the integration of material preparation and parts forming. At present, there are many studies on aluminum alloy prepared by metal additive manufacturing, but most of them focus on Al-Si casting aluminum alloy. This kind of alloy is easy to form under the action of lasers, but its mechanical properties and corrosion resistance are not high. Traditional 2XXX series, 3XXX series, 7XXX series, etc. aluminum alloys face many difficulties in laser additive manufacturing because of low-laser absorptivity or stress cracking caused by various factors after laser irradiation. This Special Issue is focused on the design of aluminum alloy for laser additive manufacturing process, process optimization, and the control of microstructure and performance. Through the publication of this Issue, we hope to form a series of professional aluminum alloy design and preparation for metal additive manufacturing.

Prof. Dr. Bo Song
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

  • Aluminum Alloy
  • Additive Manufacturing
  • Microstructure
  • Mechanical Properties
  • Process Optimization
  • Design and Preparation

Published Papers (2 papers)

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Research

15 pages, 4499 KiB  
Article
First-Principles Study on Graphene/Mg2Si Interface of Selective Laser Melting Graphene/Aluminum Matrix Composites
by Zhanyong Zhao, Shijie Chang, Jie Wang, Peikang Bai, Wenbo Du and Wenjie Zhao
Metals 2021, 11(6), 941; https://doi.org/10.3390/met11060941 - 10 Jun 2021
Cited by 3 | Viewed by 1994
Abstract
The bonding strength of a Gr/Mg2Si interface was calculated by first principles. Graphene can form a stable, completely coherent interface with Mg2Si. When the (0001) Gr/(001) Mg2Si crystal plane is combined, the mismatch degree is 5.394%, [...] Read more.
The bonding strength of a Gr/Mg2Si interface was calculated by first principles. Graphene can form a stable, completely coherent interface with Mg2Si. When the (0001) Gr/(001) Mg2Si crystal plane is combined, the mismatch degree is 5.394%, which conforms to the two-dimensional lattice mismatch theory. At the interface between Gr/Mg2Si, chemical bonds were not formed, there was only a strong van der Waals force; the interfaces composed of three low index surfaces (001), (011) and (111) of Mg2Si and Gr (0001) have smaller interfacial adhesion work and larger interfacial energy, the interfacial energy of Gr/Mg2Si is much larger than that of α-Al/Al melt and Gr/Al interfacial (0.15 J/m2, 0.16 J/m2), and the interface distance of a stable interface is larger than the bond length of a chemical bond. The interface charge density difference diagram and density of states curve show that there is only strong van der Waals force in a Gr/Mg2Si interface. Therefore, when the Gr/AlSi10Mg composite is stressed and deformed, the Gr/Mg2Si interface in the composite is easy to separate and become the crack propagation source. The Gr/Mg2Si interface should be avoided in the preparation of Gr/AlSi10Mg composite. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Aluminum Alloy and Its Composites by Additive Manufacturing)
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13 pages, 5178 KiB  
Article
Microstructure and Mechanical Properties of a Combination Interface between Direct Energy Deposition and Selective Laser Melted Al-Mg-Sc-Zr Alloy
by Cao Deng, Ruidi Li, Tiechui Yuan, Pengda Niu and Yin Wang
Metals 2021, 11(5), 801; https://doi.org/10.3390/met11050801 - 14 May 2021
Cited by 7 | Viewed by 2498
Abstract
Selective laser melting (SLM) and direct energy deposition (DED) are two widely used technologies in additive manufacturing (AM). However, there are few studies on the combination of the two technologies, which can synthetically combine the advantages of the two technologies for more flexible [...] Read more.
Selective laser melting (SLM) and direct energy deposition (DED) are two widely used technologies in additive manufacturing (AM). However, there are few studies on the combination of the two technologies, which can synthetically combine the advantages of the two technologies for more flexible material design. This paper systematically studies the Al-Mg-Sc-Zr alloy by combination of SLM and DED with emphasis on its bonding properties, microstructure, and metallurgical defects. It is found that the aluminum alloy prepared by the two methods achieves a good metallurgical combination. The microstructure of aluminum alloy prepared by DED is composed of equiaxed crystals, and there are a large number of Al3(Sc, Zr) precipitated phase particles rich in Sc and Zr. The microstructure of SLM aluminum alloy is composed of equiaxed crystals and columnar crystals, and there is a fine-grained area at the boundary of the molten pool. With the decrease of laser volumetric energy density (VED), the width and depth of the molten pool at the interface junction gradually decrease. The porosity gradually increases with the decrease of VED, and the microhardness shows a downward trend. Tensile strength and elongation at fracture of the SLM printed sample at 133.3 J/mm3 are about 400 MPa and 9.4%, while the direct energy depositioned sample are about 280 MPa and 5.9%. Due to the excellent bonding performance, this research has certain guiding significance for SLM–DED composite aluminum alloy. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Aluminum Alloy and Its Composites by Additive Manufacturing)
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