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Due to their lightweight and high specific strength, Mg-based alloys are considered as substitutes to their heavier counterparts in applications in which corrosion is non-relevant and weight saving is of importance. Furthermore, due to the biocompatibility of Mg, some alloys with controlled corrosion rates are used as degradable implant materials in the medical sector. The typical processing route of Mg parts incorporates a casting step and, subsequently, a thermo–mechanical treatment. In order to achieve the desired macroscopic properties and thus fulfill the service requirements, thorough knowledge of the relationship between the microstructure, the processing steps, and the resulting property profile is necessary. This Special Issue covers in situ and ex situ experimental and computational investigations of the behavior under thermo–mechanical load of Mg-based alloys utilizing modern characterization and simulation techniques. The papers cover investigations on the effect of rare earth additions on the mechanical properties of different Mg alloys, including the effect of long-period stacking-ordered (LPSO) structures, and the experimental and computational investigation of the effect of different processing routes.

Technology: general issues --- magnesium alloys --- long period stacking ordered structures (LPSO) --- synchrotron radiation diffraction --- magnesium alloy --- low-speed extrusion --- microstructure evolution --- mechanical properties --- thermomechanical processing --- calcium addition --- disintegrated melt deposition --- processing map --- formability --- initial texture --- deformation mechanism --- texture evolution --- ductile damage --- GTN model --- magnesium --- in-situ --- deformation mechanisms --- deformation behaviour --- restoration mechanisms --- electron microscopy --- characterisation --- in-situ diffraction --- Mg-LPSO alloys --- neutron diffraction --- EBSD --- dislocation slip --- twinning --- n/a

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The need to reduce the ecological footprint of water/land/air vehicles in this era of climate change requires pushing the limits regarding the development of lightweight structures and materials. This requires a thorough understanding of their thermomechanical behavior at several stages of the production chain. Moreover, 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. The present Special Issue, comprising eight original research articles, is dedicated to disseminating current efforts around the globe aimed at advancing understanding of the thermomechanical behavior of structural lightweight alloys under processing or service conditions.

n/a --- microstructure --- strength --- X-ray diffraction --- 7003 alloy --- in situ synchrotron radiation diffraction --- 3D microstructure --- materials modelling --- zinc addition --- tensile test --- connectivity --- DSC --- in-situ tensile deformation --- wire fabrication --- magnesium alloys --- welding --- alloying --- AlMgSi alloy --- LPSO-phase --- mechanical properties --- Mg-Nd-Zn alloys --- thermomechanical treatment --- Cast Al-Si alloys --- EN AW-6082 --- 3D characterization --- damage --- dislocations --- dynamic recrystallization --- powder metallurgy --- aluminum welding --- recovery --- corrosion resistance --- recrystallisation --- numerical simulation --- second phases --- digital image correlation --- ECAP --- aluminum nanocomposites --- deformation behaviour --- thermo-mechanical analysis --- neodymium --- aluminium alloy --- TIG fillers --- electrical conductivity --- TEM --- synchrotron tomography