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An investigation comparing the local stress and strain in a centimeter-scale heterogeneously-compressed AA 1050 ring under nearly full sticking conditions has been carried out. Three complementary techniques were used, covering multiple length scales from nanometers to tens of millimeters, namely electron microscopy (electron backscatter diffraction), microhardness, and finite element modelling. To underpin the present findings on the centimeter-scale heterogeneous structure, the same techniques were applied in an analysis of the homogeneous microstructure resulting from compression of cylinders of the same original hot-extruded AA 1050 material. The analyses support the idea that the local-region microstructure in a heterogeneous structure evolves in accordance with universal mechanisms and principles established for the deformation microstructure of polycrystalline metals.

Comparison of local stress and strain in a heterogeneouslycompressed AA 1050 ring by electron microscopy, microhardness and finite element modelling