This paper deals with influence of microstructure of magnesium alloy AZ91 on its mechanical properties. Tensile characteristics and microstructures of cast and extruded state of the alloy, and both of these initial states after equal channel angular pressing (ECAP), were compared. It was found that tensile properties are not only determined by the grain size but another aspect plays also an important role because the highest values of σ0.2 proof stress and tensile strength were achieved for the alloy in extruded state despite its higher average grain size compared to both ECAPed states of the alloy. Compared to this, microhardness seems to be related only to grain size.Keywords: AZ91, microstructure, ECAP, tensile properties
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