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Positron annihilation lifetime spectroscopy (PALS) was utilized to characterize dissimilar aluminum alloy workpieces of 2017A-T451 and 7075-T651 joined by friction stir welding. Since the interphase boundaries between the aluminum matrix and second phase particles provided open volumes to trap the positrons, positron lifetimes in the welds and in the heat-affected and thermomechanically-affected zones...
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