During the last decades there is continuous tendency to lower the weight of cars and thus automotive industry is trying to find other metal (or e.g. plastic) materials suitable to produce lighter car-bodies. As one of these materials can be taken also magnesium alloy AZ31B-0 that is suitable for forming. Among advantages of magnesium belong mainly its low specific weight, availability and relatively inexhaustibility of its sources. As a disadvantage there is mostly low Young´s modulus and crystallization in the hexagonal-closed-packed lattice which causes limited ductility of the magnesium at room temperature. Metal forming technologies for the magnesium alloys respect this specification about hexagonal-closed-packed lattice of the basic solid solution and its microstructure. Low ductility at the temperature of 200 °C is caused by the low number of the slip system which takes place only on the basal planes. At temperatures over 225 °C there are already acting more slip planes. This paper deals with the experiment where were (with the help of the contact-less optical system ARAMIS) determined strain distributions and their maximal magnitudes in the fracture vicinity under the uni-axial loading at different temperatures. Eventually new grains creation and development of the recrystallization was examined by the optical metallography.Keywords: AZ31B-O, crystallographic texture, hot forming, strain distribution, optical system ARAMIS
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