AbstractThree magnesium alloys with texture and microstructure modifying elements, binary M2, and the alloyed counterparts with Ca (MX21) and rare earth element (ME21) were extruded to flat bands under similar conditions. The microstructure and texture in extrusion significantly differ from those developed in rolled magnesium sheets. The influence on the mechanical properties and the forming behaviour, in terms of Erichsen values, with relation to microstructure, texture, and strain rate sensitivity was examined. A clear difference in texture development and strain rate sensitivity is shown in dependence on the alloying composition. In addition, not only the texture, but also the microstructure has a great influence on formability.