Structural phenomena induced in the course of and post low-temperature KOBO extrusion of AA6013 aluminum alloy

With the use of TEM, HRTEM and HRSTEM techniques, the clusters were identified as nano-metric structural elements containing additional atomic planes. It was concluded, that if the number of generated point defects is higher than the number of defects taking part in the relaxation processes (decrease in, lack of precipitation hardening), during the ageing process, hardening clusters of point defects are formed.