Abstract: Ductility of Mg – alloys is linked to a shortage of independent slip systems. Basaltextured
samples of Mg-Al-Zn alloy are examined for presence of dislocations of different types
after hot compression tests of cast samples and cold compression tests of hot-rolled samples. The
JEM-1000, electron transmission microscope with an accelerating voltage of 750 kV using a dark
field–weak beam method of observation and the g·b=0 invisibility criterion as a basic method of the
analysis of Burgers vectors, is used to analyse the samples. Dislocations with Burgers vectors ,
[c] and are found. The results are used to evaluate the dislocation density and determine the
possible dislocation reactions.