Aluminium-manganese alloys (AlMn alloys) are aluminium alloys that contain manganese (Mn) as the main alloy element. They consist mainly of aluminium (Al); in addition to manganese, which accounts for the largest proportion of about 1% of the alloying elements, iron (Fe), silicon (Si), magnesium (Mg) or copper (Cu) may also be contained. AlMn is almost only used as a wrought alloy and is processed into sheets or profiles by rolling or extrusion presses. The alloys are corrosion-resistant, have low strengths for aluminium alloys and are not hardenable (by heat treatment). They are standardised in the 3000 series. Applications Aluminium manganese alloys are used for applications with low demands on strength and are also applicable in chemical and food-related environments due to their corrosion resistance. AlMn is therefore not a construction material but a functional material. AlMn is processed into beverage cans and is generally referred to as the packaging material used. It is used for apparatus and pipes in the chemical industry for roof cladding, wall coverings, pressure vessels, roller shutters, roller doors and heat exchangers. Influences of the alloy elements Manganese combines with aluminium to form intermetallic phases and thus increases strength. Each percent of manganese increases the strength by about 42 MPa. Iron and silicon are usually unwanted accompanying elements that cannot be completely removed. Magnesium and copper increase strength better (70-85 MPa per % Mg) and are added to increase strength. Phases Binary aluminium manganese phases Aluminium and manganese are partially miscible in the solid state. In addition, they form various intermetallic phases. The eutectic between aluminium and Al 6 Mn is 1.3% Mn and 660 °C, while pure aluminium melts at 660.2 °C. Values ​​of 1.8% and 657 °C or 658 °C can also be found in older literature. Above 710 °C, Al4Mn is formed with an Mn content of at least 4%. However, such high levels are not technically used. Below 510 °C or 511 °C, Al12Mn forms . The solubility of manganese in the aluminum solid solution falls rapidly with decreasing temperature and is close to zero at room temperature. Phases in AlMn materials with other elements Some of the AlMn materials also contain iron (Fe) or silicon (Si) additives. These form the phases Al3Fe, Al8Fe2Si, Al5FeSi, Al15Si2(Mn,Fe)3. Mixed crystals also occur in the form of Al12(Mn,Fe)3Si. Aluminum and Al15Si2(Mn,Fe)3 are formed from the melt, Al3Fe and Al6(Mn,Fe) at 648 °C At temperatures below