| Popis: |
Magnesium alloys provide wide application areas due to their low density, high specific strength, and stiffness. However, the HCP (hexagonal close pack) crystal lattice structure of the magnesium can limit its formability. Thermomechanical processes like extrusion provide refined microstructure, better mechanical properties, and higher ductility than casting. Heat treatment is an effective way to enhance mechanical properties using precipitation hardening. In this study, tubular extruded profiles produced from AZ31 and AM50 magnesium alloys were investigated. Profiles were artificially aged to get T5 condition. Tensile and hardness tests were carried out with the longitudinal specimens taken out parallel to the extrusion direction. The heat treatment effect was presented with microstructural investigation via both optical microscopy and scanning electron microscopy analysis of fracture surfaces. As a result, the effect of the heat treatment process on the mechanical properties and microstructural behaviors of AZ31 and AM50 will be revealed. |
