Special Issue "Selected Papers from the 2nd International Conference on Light Materials LightMAT 2017"

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

Deadline for manuscript submissions: closed (15 July 2018)

Special Issue Editors

Guest Editor
Dr.-Ing. Axel von Hehl

Stiftung Institut für Werkstofftechnik (IWT), Bremen 28359, Germany
Website 1 | Website 2 | E-Mail
Interests: lightweight materials; alloy development for additive manufacturing; multi-material design; hybrid materials; processing; forming; selective laser melting; heat treatment; interface engineering; joining, modeling; testing and characterization; DPS calorimetry; failure mechanisms; survival probability models
Guest Editor
Prof. Dr.-Ing. Jürgen Hirsch

Hydro Aluminium Rolled Products GmbH, Research and Development, Georg-von-Boeselager-Str. 21, 53117 Bonn, Germany
Website | E-Mail
Interests: aluminum: basics, processing and applications, lightweight construction, simulation and through-process-modeling, mechanical properties, microstructure, texture and anisotropy
Guest Editor
Prof. Dr. Karl Ulrich Kainer

1 Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Director Institute of Materials Research, Magnesium Innovation Centre, Max-Planck-Str. 1, 21502 Geesthacht, Germany
2 Hamburg University of Technology, Institute of Material Physics and Technology, Chair Materials Technology, Eissendorfer Str. 42, 21073 Hamburg, Germany
Website 1 | Website 2 | E-Mail
Interests: magnesium: alloy development, process development, wrought alloys, microstructure and texture design, corrosion, surface treatment; magnesium bio-materials
Guest Editor
Prof. Dr.-Ing. habil. Christoph Leyens

1 Fraunhofer IWS Dresden, Winterbergstraße 28, 01277 Dresden, Germany
2 Technische Universität Dresden, Institute of Materials Science, Helmholtzstraße 7, 01069 Dresden, Germany
Website 1 | Website 2 | E-Mail
Interests: lightweight and high temperature materials: surface science and technology, laser materials processing, additive manufacturing, materials characterization and testing

Special Issue Information

Dear Colleagues,

Since the beginning of industrial production in the late eighteenth century, the demand for light metals has been increasing steadily. Rapid technological development has simultaneously led to today’s alloys and production processes. Nowadays, light metals are spread throughout nearly all technical applications of human life. The present means of transportation would have been inconceivable without light metals.

Compared to fiber-reinforced polymers (FRPs), metallic light materials, such as aluminum, and magnesium alloys, as well as titanium alloys, provide an excellent impact toughness, good wear, and thermal resistance, as well as high life cycle fatigue, along with moderate materials and processing costs, and, furthermore, an outstanding recyclability. However, owing to the ongoing need for weight reduction, alternative structural materials, such as high-strength FRPs, penetrate more and more into transportation applications. Consequently, effective weight reduction calls for advanced material compositions. This necessitates a multidisciplinary approach that combines materials science and production technology with designing and dimensioning.

Taking up these aspects, the 2nd International Conference on Light Materials LightMAT 2017 (https://lightmat2017.dgm.de) gives a comprehensive overview and new insight into the three most important light metals: Aluminium, magnesium, and titanium, and their combinations. These materials are viewed individually or in combination in multi-material designs, including aspects of processing, joining, and corrosion protection. In addition, promising enabling-technologies, such as additive manufacturing are highlighted.

  • Conventional and advanced light weight applications and products in automotive, aerospace and other relevant transport and lightweight applications
  • Fundamental aspects of the three metallic lightweight materials and their alloys, their processing and (physical) metallurgy issues involved
  • Microstructure evolution, related properties and advanced simulation
  • Industrial fabrication, processing, joining and corrosion protection issues
  • Additive manufacturing of metallic structures enabling novel lightweight designs

This Special Issue on “Light Materials” is set to publish selected works presented at this event, in order to share recent progress and new achievements in this emerging field with broader scientific and industrial communities.

Axel von Hehl
Jürgen Hirsch
Karl Ulrich Kainer
Christoph Leyens
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 papers will be 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 1200 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

  • Processing
  • Applications
  • Alloy Development
  • Hybrid Materials and Multi-material designs
  • Characterization and testing
  • Computational materials design
  • Sustainability
  • Additive Manufacturing

Published Papers (3 papers)

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Research

Open AccessArticle Influence of Short-Term Heat Treatment on the Mechanical Properties of Al–Mg–Si Profiles
Metals 2018, 8(9), 664; https://doi.org/10.3390/met8090664
Received: 16 August 2018 / Revised: 21 August 2018 / Accepted: 23 August 2018 / Published: 24 August 2018
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Abstract
Aluminum profiles—for instance, profiles made of precipitation-hardenable alloys—are increasingly used for decorative details in the automotive industry. Typically, after hot extrusion and at least two to three days of natural aging (NA), the aluminum profiles are artificially aged. A commercial EN AW-6060 alloy
[...] Read more.
Aluminum profiles—for instance, profiles made of precipitation-hardenable alloys—are increasingly used for decorative details in the automotive industry. Typically, after hot extrusion and at least two to three days of natural aging (NA), the aluminum profiles are artificially aged. A commercial EN AW-6060 alloy of high purity was used for this investigation. Tensile tests were used as the main measurement method. This article focuses on the effect of short-term heat treatment on the point in time at which a significant increase of the ultimate tensile strength (UTS) during NA can be measured. Short-term heat treatment is shown to delay this point in time by almost four days, but it increases the variation of UTS. A heterogeneous temperature profile during short-term heat treatment was identified as one reason for this result. Finally, a strategy for minimizing variations in mechanical properties of artificially-aged aluminum alloys was developed, based on the experimental results of this study. Full article
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Open AccessArticle Precipitation Hardening on Mechanical and Corrosion Properties of Extruded Mg10Gd Modified with Nd and La
Metals 2018, 8(8), 640; https://doi.org/10.3390/met8080640
Received: 13 July 2018 / Revised: 3 August 2018 / Accepted: 3 August 2018 / Published: 14 August 2018
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Abstract
To improve the mechanical and corrosion properties of Mg10Gd, Nd and La are added, and from that, the influence of precipitation hardening was studied. An increase in strength, by decreasing grain size and increasing the volume fraction of Rare Earth-rich precipitates, has been
[...] Read more.
To improve the mechanical and corrosion properties of Mg10Gd, Nd and La are added, and from that, the influence of precipitation hardening was studied. An increase in strength, by decreasing grain size and increasing the volume fraction of Rare Earth-rich precipitates, has been found when increasing the amount of alloying elements. Alloys containing La appear less ductile. Where crack propagation is studied using 3-point bending on Mg10Gd and Mg10Gd1Nd, the failure is mostly driven by twinning; the alloys with La show suppressed twinning, but crack initiation and propagation is caused by brittle and coarse precipitates. Precipitation hardening did not improve fracture toughness and was mostly based on strong grain growth and low solubility of La in Mg. With added alloying elements, the grain size was found to be slightly smaller in the T6 condition—precipitates seem to pin grain boundaries and therefore limit grain boundary mobility. Alloys containing Nd showed the best precipitation hardening response. Corrosion behavior, investigated by voltammetry and immersion, showed the best behavior in the precipitation-hardened condition. Corrosion rates and surface morphology are used to discuss corrosion properties. Full article
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Graphical abstract

Open AccessArticle Designed Materials by Additive Manufacturing—Impact of Exposure Strategies and Parameters on Material Characteristics of AlSi10Mg Processed by Laser Beam Melting
Metals 2018, 8(7), 491; https://doi.org/10.3390/met8070491
Received: 9 May 2018 / Revised: 6 June 2018 / Accepted: 25 June 2018 / Published: 27 June 2018
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Abstract
The Laser Beam Melting (LBM) Additive Manufacturing technology for metal processing is based on the local application of an intense laser beam, causing a characteristic microstructure, which can achieve higher mechanical properties than conventionally manufactured equivalents. The material is created incrementally in sections
[...] Read more.
The Laser Beam Melting (LBM) Additive Manufacturing technology for metal processing is based on the local application of an intense laser beam, causing a characteristic microstructure, which can achieve higher mechanical properties than conventionally manufactured equivalents. The material is created incrementally in sections that are processed with different manufacturing parameters. This paper proposes the creation of Designed Materials by varying the manufacturing parameters and exposure strategy in order to induce a gradient or a local change of properties by designing the microstructure. Such materials could also be created by changing the material topology on a micro-, meso-, or macro-scale, or on multiple scales at once. This enables systematic creation of material types like Functionally Graded Materials (FGMs), Metamaterials, or other Designed Materials, in which characteristics can be varied locally in order to create a customized material. To produce such materials by LBM, it is necessary to gain a detailed understanding about the influence of the manufacturing parameters. Experimental studies have been carried out to investigate the melt pool geometry and microstructure resulting from the exposure parameters. Based on the results, parameter sheets have been derived, which support the process of finding optimized parameter sets for a specific purpose. General methods and their ability to influence the material structure and properties were tested and evaluated. Furthermore, the resulting change of the microstructure was analyzed and a first Graded Material was generated and analyzed to show the potential and possibilities for Designed Materials on multiple scales by Laser Beam Melting. Full article
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