Fig. 4a presents shape of products obtained during research works. Microstructure of AZ31 alloy in initial state
and after forging was analyzed using optical microscopy (OM) and electron microscopy (SEM). Research works
of the formed forgings structure were conducted on their cross sections in three areas marked in Fig. 4b. Evaluation
of the grain mean size was made according to norm ASTM E112-10. Changes of microstructure caused by forging
processes considerably influenced properties of the deformed AZ31 alloy. Taking into consideration the fact that
the alloy is destined to be used as aircraft construction elements, it was assumed that research will concern
determining of the initial material and formed forgings mechanical properties in a static test of tension and hardness
measurement. Hardness was determined by Brinell method on forgings cross sections, applying intender in the form
of a ball with radius 2.5 mm at load 31.25 kG. Static tests of tension were conducted in the room temperature
on a resistance device of pressure 1000 kN. For tests needs, fivefold forgings were used, which were cut along
forgings base (area 2 and 3) and from the ribs (area 1).