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Metals
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Advances in Al-Mg-Si Alloys
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Advances in Al-Mg-Si Alloys

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 7458

Special Issue Editor

Dr. Jaehwang Kim

E-Mail Website
Guest Editor
Carbon Materials R&D Group, Korea Institute of Industrial Technology, Jeonju 54853, Republic of Korea
Interests: Al-Mg-Si alloys; age-hardening; precipitates; nanocluster; three-dimensional atom probe
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Al-Mg-Si alloys have been widely used in the automobile industry because of their excellent age-hardening response, formability, and corrosion resistance. Enhancement of strength in Al-Mg-Si alloys can be achieved through the formation of precipitates. Various approaches to clarify the age-hardening behavior including the early stage of phase decomposition, structure analysis of precipitates, and transition behavior from nuclei to strengthening phases have been attempted through indirect and direct observation methods. The age-hardening sequence has continuously been developed with the structure analysis of precipitate using HRTEM. The clustering behavior with the Mg/Si ratio and microalloying such as Cu, Ag and Sn have been actively studied using DSC, hardness, tensile test and electrical resistivity measurements and three-dimensional atom probe (3DAP) analyses. The amount of vacancy affecting the atomic diffusion has been characterized by positron and muon. First principal calculation and Monte Carlo simulation help to understand the structure of precipitates, nucleation and growth behavior of the metastable phases. The variety of the thermomechanical process through strain-induced deformation and step/pre-/interrupted aging heat treatment has been introduced to improve the age-hardening response.

The Special Issue embraces advanced characterization, fundamental physics and review of the age-hardening behavior as well as the industrial viewpoint for application in Al-Mg-Si alloys. Manuscripts are highly welcomed from both academic and commercial viewpoints with progressive results.

Dr. JaeHwang Kim
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

  • Al-Mg-Si alloys
  • Age-hardening
  • Precipitates
  • Nanocluster
  • Vacancy
  • First principal calculation
  • Transmission electron microscopy
  • Two-step aging
  • Monte Carlo simulation
  • Three-dimensional atom probe

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Published Papers (2 papers)

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Research

11 pages, 3857 KiB  
Article
Homogenisation Efficiency Assessed with Microstructure Analysis and Hardness Measurements in the EN AW 2011 Aluminium Alloy
by Maja Vončina, Aleš Nagode, Jožef Medved, Irena Paulin, Borut Žužek and Tilen Balaško
Metals 2021, 11(8), 1211; https://doi.org/10.3390/met11081211 - 29 Jul 2021
Cited by 3 | Viewed by 1865
Abstract
When extruding the casted rods from EN AW 2011 aluminium alloys, not only their homogenized structure, but also their extrudable properties were significantly influenced by the hardness of the alloy. In this study, the object of investigations was the EN AW 2011 aluminium [...] Read more.
When extruding the casted rods from EN AW 2011 aluminium alloys, not only their homogenized structure, but also their extrudable properties were significantly influenced by the hardness of the alloy. In this study, the object of investigations was the EN AW 2011 aluminium alloy, and the effect of homogenisation time on hardness was investigated. First, homogenisation was carried out at 520 °C for different times, imitating industrial conditions. After homogenisation, the samples were analysed by hardness measurements and further characterised by microscopy and image analysis to verify the influence of homogenisation on the resulting microstructural constituents. In addition, non-equilibrium solidification was simulated using the program Thermo-Calc and phase formation during solidification was investigated. The homogenisation process enabled more rounded shape of the Al2Cu eutectic phase, equilibrium formation of the phases, and the precipitation in the matrix, leading to a significant increase in the hardness of the EN AW 2011 aluminium alloy. The experimental data revealed a suitable homogenisation time of 4–6 h at a temperature of 520 °C, enabling optimal extrusion properties. Full article
(This article belongs to the Special Issue Advances in Al-Mg-Si Alloys)
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11 pages, 5050 KiB  
Article
The Role of Grain Boundary Precipitates during Intergranular Fracture in 6xxx Series Aluminium Alloys
by Inga G. Ringdalen, Ingvild J. T. Jensen, Calin D. Marioara and Jesper Friis
Metals 2021, 11(6), 894; https://doi.org/10.3390/met11060894 - 30 May 2021
Cited by 7 | Viewed by 4147
Abstract
During ageing, 6xxx aluminium alloys will develop a microstructure characterised by needle-shaped Mg/Si-rich precipitates in the bulk, precipitate-free zones along the grain boundaries and larger Mg/Si-rich precipitates on the grain boundary. Depending on, among other things, the size of the precipitate-free zone, these [...] Read more.
During ageing, 6xxx aluminium alloys will develop a microstructure characterised by needle-shaped Mg/Si-rich precipitates in the bulk, precipitate-free zones along the grain boundaries and larger Mg/Si-rich precipitates on the grain boundary. Depending on, among other things, the size of the precipitate-free zone, these alloys are prone to intergranular fracture. The role of the grain boundary precipitates during the initiation and propagation of the intergranular fracture is still not fully understood. Transmission Electron Microscopy has been used to characterise the grain boundaries and grain boundary precipitates. The precipitates were found to be of the β′ type surrounded by a layer of U2 structure. The atomic details of relevant interfaces of Al-β′ were characterised for further investigation. Density Functional Theory simulations were performed on the bulk precipitate structures and on the interfaces obtained experimentally. The decohesion energy of these interfaces was calculated and compared to bulk values. In addition, simulated tensile tests were performed in order to find values for the tensile strength σt. The dependence of the interfacial energy and tensile strength of β′ grain boundary precipitates were found to depend on the orientation and type of interface in addition to the amount of defects on the interface. Full article
(This article belongs to the Special Issue Advances in Al-Mg-Si Alloys)
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