Dislocation structures and flow stress

The relation between polycrystal deformation and single crystal deformation has been studied for pure aluminium deformed in tension. A quantitative microstructural analysis has shown a significant effect of grain orientation on the microstructural evolution of grains in the polycrystal. This analysis has made it possible to estimate the flow stress of grains embedded in a polycrystal allowing a comparison with the deformation behaviour of single crystals.