Selected Papers from the 4th International Conference on Light Materials LightMAT 2021

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Computation and Simulation on Metals".

Deadline for manuscript submissions: closed (28 February 2022) | Viewed by 2859

Special Issue Editors


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Guest Editor
Airbus, Willy-Messerschmitt-Strasse 1, Taufkirchen, Germany
Interests: lightweight materials and processes; technology upscaling approaches; multifunctional material technologies; thermal management; ICME (integrated compotation materials engineering); green material and sustainable technologies; recyclability; eco design and LCA; circular economy and E2E

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Guest Editor
Head of the Physical Metallurgy Group, Department of materials science and engineering, Norwegian University of Science and Technology, Alfred Getz v. 2, 7491 Trondheim, Norway
Interests: physical metallurgy; thermo-mechanical processing of aluminum alloys and the interplay between microstructure and mechanical properties; solid-state joining and additive manufacturing of multi-materials; microstructure characterization using in-situ SEM in combination with digital image correlation
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Guest Editor
Head of Chair of Materials Science and Testing, Institute for Materials Engineering, University of Siegen, Paul-Bonatz-Straße 9-11, 57076 Siegen, Germany
Interests: lightweight materials; alloy development for additive manufacturing; multi-material-design and hybrid materials; processing; forming; selective laser melting; heat treatment; interface engineering; joining; modeling; testing and characterization; differential scanning calorimetry; x-ray microscopy; failure mechanisms; survival probability models
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

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

Metallic light materials, such as aluminum, and magnesium alloys as well as titanium alloys, provide an excellent impact toughness, a good wear, and thermal resistance, as well as a 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, effective weight reduction calls for advanced material solutions. This necessitates a multidisciplinary approach that combines materials science and production technology with designing and dimensioning.

Taking up these aspects, the 4th International Conference on Light Materials LightMAT 2021 (https://dgm.de/lightmat/) gives a comprehensive overview and new insight into the three most important light metals: aluminium, magnesium and titanium, and their combinations. In addition, the conference will focus on eco-efficiency in materials and processes. In this context, we address the question:

What are the innovative research business models, for materials and material processes shearing with industrial needs, for contributing to accelerated material circularity, sustainability, and also to the dematerialization of our economy related to less dependency on primary materials?

The materials are viewed individually, intended to provide comparison and cross-fertilization, giving a comprehensive overview of individual advances, challenges, and highlights, covering:

  • Conventional and advanced lightweight applications and products in automotive, aerospace, and other relevant transport and 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;
  • Formability and advanced forming of light alloys to shape complex parts.

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.

Dr. Blanka Lenczowski
Prof. Dr. Ida Westermann
Prof. Dr. Axel von Hehl
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 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

  • Applications
  • Processing
  • Alloy development
  • Multi-material designs
  • Characterization and testing
  • Computational materials engineering
  • Eco-efficiency

Published Papers (2 papers)

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Research

12 pages, 4534 KiB  
Article
Hydrogen as a Temporary Alloying Element for Establishing Specific Microstructural Gradients in Ti-6Al-4V
by Christopher David Schmidt, Hans-Jürgen Christ and Axel Von Hehl
Metals 2022, 12(8), 1267; https://doi.org/10.3390/met12081267 - 28 Jul 2022
Viewed by 1188
Abstract
Parts of vehicles, such as landing gear components of aircrafts, are subject to growing demands in terms of sustainability via lightweight design and durability. To fulfill these requirements, the development of thermochemical processes is auspicious. Titanium alloys allow a heat treatment in hydrogen-containing [...] Read more.
Parts of vehicles, such as landing gear components of aircrafts, are subject to growing demands in terms of sustainability via lightweight design and durability. To fulfill these requirements, the development of thermochemical processes is auspicious. Titanium alloys allow a heat treatment in hydrogen-containing atmosphere for temporary hydrogen alloying, often called thermohydrogen treatment (THT). The investigation presented intends to realize a local microstructure modification of Ti-6Al-4V by means of THT. The study aims to use hydrogen (H) as a promoter for changing the local distribution and morphology of strengthening precipitates during THT as well as the local grain size (microstructural gradient). Both shall improve the fatigue properties of the material after hydrogen degassing. To derive suitable thermohydrogen treatment process parameters, the resulting fatigue crack propagation resistance and fracture toughness after different solution heat treatments are determined experimentally and compared to each other. Moreover, various graded microstructures are evaluated after hydrogen uptake (hydrogenation) and hydrogen degassing (dehydrogenation) using numerically simulated hydrogen concentration profiles, observed hardness curves, metallographically determined microstructure gradients and the corresponding results of the phase analysis by means of X-ray diffraction. The study shows that hydrogenation at 500 °C and dehydrogenation at 750 °C enables the generation of a promising microstructural gradient. Full article
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17 pages, 12957 KiB  
Article
Observations of Microstructure-Oriented Crack Growth in a Cast Mg-Al-Ba-Ca Alloy under Tension, Compression and Fatigue
by Petra Maier, Daniel Ginesta, Benjamin Clausius and Norbert Hort
Metals 2022, 12(4), 613; https://doi.org/10.3390/met12040613 - 02 Apr 2022
Cited by 4 | Viewed by 1692
Abstract
DieMag633, a cast Mg-Al-Ba-Ca alloy, was the focus of this study. Brittle interdendritic phases strongly influenced the crack initiation and propagation under quasi-static and fatigue loading. Especially under tensile loading, the material showed a low resistance to failure. Selected fatigue loading sequences were [...] Read more.
DieMag633, a cast Mg-Al-Ba-Ca alloy, was the focus of this study. Brittle interdendritic phases strongly influenced the crack initiation and propagation under quasi-static and fatigue loading. Especially under tensile loading, the material showed a low resistance to failure. Selected fatigue loading sequences were applied to investigate their influence on crack propagation. DieMag633 in this study contained shrinkage cavities and pores of significant size and irregular distribution. Even though pores played a role in initiating the crack, it was mainly influenced by the Ba- and Ca-rich phases, being and staying much harder under deformation than the Mg-matrix. Apart from the fatigue crack propagation region under fatigue loading, there was no transgranular cracking found within the dendritic α-Mg grains. Only under compression did the dendritic α-Mg grains bridge the crack from one brittle phase to another. Transgranular cracking within the compact Ba-rich phase was very pronounced, starting with many microcracks within this phase and then connecting to the macrocrack. The lamellar Ca-rich phase showed also mainly transgranular cracking, but being small lamellae, intergranular cracking was additionally found. The hardness increase under deformation depended on the loading condition; a compression load strain-hardened the material the most. µCT analysis was applied to characterize the amount and location of the shrinkage cavities and pores in the individual gauge length. Full article
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