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Special Issue "Thermo-Mechanical Behaviour of Structural Lightweight Alloys"

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: 31 March 2018

Special Issue Editor

Guest Editor
Prof. Dr. Guillermo Requena

Department of Metallic Structures and Hybrid Materials Systems, Institute for Materials Research, German Aerospace Centre, Linder Höhe, 51147, Cologne, Germany
Website | E-Mail
Interests: light alloys; metals for additive manufacturing; three-dimensional material characterization; synchrotron tomography; high energy synchrotron diffraction; aluminum alloys; titanium alloys; magnesium alloys; titanium aluminides; metal matrix composites; phase transformations; relationships microstructure-properties; thermo-mechanical behavior of metals

Special Issue Information

Dear Colleagues,

The need to reduce the ecological footprint of (water, land, air) vehicles in this era of climate change requires pushing the limits in the development of lightweight structures and materials.

The development and optimization of lightweight metals for structural components requires a thorough understanding of their thermo-mechanical behavior at several stages of the production chain, as well during service conditions. For instance, thermo-mechanical treatments play a decisive role in the processing of wrought products and are beginning to see the light for application in wire-based additive manufacturing technologies. During service, the response of lightweight alloys under the simultaneous influence of mechanical loads and temperature can determine the lifetime and performance of a multitude of structural components used for transportation such as in combustion engines or aircraft turbines.

The present Special Issue is dedicated to disseminate current efforts around the globe aiming at advancing in the understanding of the thermo-mechanical behavior of structural lightweight alloys under processing or service conditions. It is therefore my pleasure to invite you to submit contributions that may take into account this thematic from and experimental or theoretical point of view for Mg, Al, Ti, TiAl alloys, as well innovative composites based on these systems or new lightweight metals.

Prof. Guillermo Requena
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 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. Materials 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 1500 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 alloys
  • magnesium alloys
  • titanium alloys
  • titanium aluminides
  • lightweight metals
  • thermo-mechanical behavior

Published Papers

This special issue is now open for submission, see below for planned papers.

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Microstructure evolution in wrought aluminium alloys during thermomechanical loads
Authors: Cecilia Poletti et al.
Abstract: Thermal and thermomechanical loads during processing of age hardenable wrought aluminium alloys induce microstructural changes that involve the movement of dislocations, their arrangement and annihilation, the movement of boundaries, and the formation/dissolution of phases. Experiments are carried out and designed to isolate thermomechanical steps along typical production routes to understand and describe physical phenomena and their interactions. In this work we physically simulate the thermomechanical process by means of cold and hot compression and torsion tests using a Gleeble ® 3800 machine to produce flow data as well as deformed samples for metallography. We use electron back scattered diffraction and synchrotron in situ experiments to obtain crystallographic information during and after plastic deformation and heat treatments. Our developed models based on dislocation densities and misorientation evolutions can describe strain hardening, dynamic recovery, continuous dynamic recrystallization and static recrystallization. The microstructure after the initial stages of the plastic deformation is composed by cells. As the deformation proceeds, both the amount of dislocation at the cell walls and the misorienation among neighbouring cells/grains increase. We use two approaches to model the subgrain structure. In the first approach, valid for moderated strains, it is assumed that the misorientation reaches a saturation after hardening. The second approach results in a continuous increment of the misorientation until a maximum value is reached, allowing the formation new high angle grain boundaries by continuous dynamic recrystallization, thus refining the microstructure at large strains. Finally, the precipitates and other intermetallic particles retard the movement of dislocations and boundaries in general. Considering this, it was demonstrated that they have special impact in the static recrystallization during subsequent heat treatments.

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