Abstract
Deformation of magnesium alloy AZ61-F with 1 wt.% of Al₂O₃ was analysed by “in-situ tensile test in SEM” and a model of fracture mechanism was suggested. Microstructure of the experimental materials is heterogeneous with grain size of 50 μm. It has been shown that during tensile deformation the failure of Mg₁₇Al₁₂ particles appeared and at the same time decohesion of the matrix- Al₂O₃ particles occurred as a result of different physical properties. The increase of stress caused the cracks propagation into the specimen and simultaneously the large damaged Mg₁₇Al₁₂ particles contributed to the fracture process. Fracture surface had transcrystalline ductile character.

Key words
AZ61-F Mg- Al₂O₃, in-situ tensile test in SEM, model of fracture mechanism

Full text (270 KB)