Strain and damage analysis using high resolution digital image correlation in the stir zone of an AA6061-AA7075 dissimilar friction stir weld

This work focuses on the strain and damage analysis of a micro tensile experiment of a AA6061-AA7075 dissimilar friction stir weld. Scanning electron microscopy combined with high resolution digital image correlation has been performed at two different scales to analyse strain fields and damage in the AA6061-AA7075 mixed region of the stir zone. Local alloy composition was identified as the critical parameter affecting the meso-scale strain distribution. At a finer scale, intermetallic particles also lead to strain localization within each individual alloy.