Two Versions of a Refined Composite Model of Internal Stress Field in Subgrain Structures

The composite model of a heterogeneous dislocation structure considering it as an agglomerate of soft regions of substructure unit interiors and hard regions of their boundaries became a useful tool of modeling of some microstructure phenomena. The paper compares two refined versions of the model suggested by Sedláček et al. as regards their application to polygonized substructures and uses them for an evaluation of the internal stress field in real substructures generated by creep at high temperatures in α-iron and pure aluminum. The result is compared with the macroscopically measured mean values of internal stress.