In studies of light metal alloys there are challenges when it comes to establishing relations between the nano‐structure and the mechanical properties in for example strength and ductility. In Al‐Mg‐Si(-Cu) alloys, the hardness increase is due to precipitation of nanometre sized metastable phases that form from solid solution during heat treatment. High strength- and weight ratio and good corrosion properties is industrially relevant due to superior mechanical properties.

Several people are studying aluminium alloys at the TEM Gemini Centre. We have several ongoing projects, including SFI PhysMet  working in close collaboration with Hydro Aluminium and other companies producing aluminum products. We also collaborate with Japanese Universities and aluminium industry through a UTFORSK project. 

Examples of what we study in the TEM: 

•    Atomic structure of precipitates using HAAADF-STEM
•    Phase fractions of precipitate phases using SPED
•    In -situ development of precipitates during aging 
•    Ealy stage of clustering, using LAADF-STEM, combined with DFT and APT
•    Grain boundary chemistry connected to intergranular corrosion
•    Solid state bonding of Al and Cu 
•    Quazi-crystalline precipitates 
•    Correlation between precipitation, deformation, precipitation free zones and strength 

More details can be found in the publications from the group. All these activities are between NTNU and SINTEF, and supported by the Research Council of Norway, in addition, many of them are supported by Hydro Aluminium.