Adiabatic shear band (ASB) formation occurs during high-speed shear deformation. It is, for example, technologically relevant during high-speed blanking. The rapid local heating associated with the high-speed plastic shear deformation leads to local thermal softening. This, in turn, promotes further local strength loss, additional local heating and thus unstable plastic deformation that ultimately leads to ASB formation. In this contribution, we investigate the thermo-mechanical behavior of and ASB formation in the non age-hardenable aluminium alloy EN AW-5754. Compression tests with cylindrical specimens are performed at different temperatures (in the range from 77 K to 773 K) and a wide range of nominal strain rates between 10^-4 and 10³ s^-1. In addition, we use newly designed S-shaped samples to directly generate ASBs. The samples are subjected to uniaxial compression, which leads to local shear deformation in a geometrically well-defined shear zone. By varying the geometry of the shear zone in the S-shaped samples, simple shear loading can be superimposed with either compressive or tensile stresses. Using this novel approach with nominal strain rates > 10² s^-1, we produce ASBs. Scanning electron microscopy is performed to characterize the microstructures in the undeformed material as well as inside the ASBs. This allows to identify the effect of different stress states on microstructural evolution during ASB formation in EN AW-5754.