Strain Characterization and Microstructure Evolution Under Deformation in 2060 Alloy

Abstract

An electron back-scattered diffraction study on the microstructure evolution of severely deformed aluminum AI6061 alloy M Vaseghi, A Karimi Taheri A new method of DIC combined with EBSD is developed for the characterization of strain and microstructure evolution during bending. The traditional microhardness point and DIC methods are used to study the microstructure evolution in 2060 alloy during bending; the interested area suffers under tensile stress, the microstructure evolution is collected by SEM, EBSD, digital image correlation (DIC) method during bending. The results shows that the DIC method can both realize the strain tensor characterization of the interested area, and can also express the local strain tensor in the micro-area even more. The degree of grain division in the process of deformation is related to the strain in this region; the grains have larger strain of small angle grain boundary (SLGBs), which results in a new micro-organizational structure.The misorientation is smaller with larger strain degree while the misorientation is larger with smaller strain.