Abstract: The dislocation microstructure was analyzed by TEM for grains of different orientations in polycrystalline copper during tensile deformation, and also the correlation of plastic deformation behavior between polycrystalline and single crystal copper was studied. The results show that three types of microstructure have been identified in polycrystalline copper after deformation. Meanwhile, an obvious correlation is found between microstructure and grain orientation. The stress strain curve of the polycrystal is calculated with fair accuracy from single crystal data, which are weighted according to the volume fraction of the three different types of microstructure, and a good match with the experimental curve has been obtained.
Correlation of plastic deformation behavior between polycrystalline and single crystal copper
Abstract:
The dislocation microstructure was analyzed by TEM for grains of different orientations in polycrystalline copper during tensile deformation, and also the correlation of plastic deformation behavior between polycrystalline and single crystal copper was studied. The results show that three types of microstructure have been identified in polycrystalline copper after deformation. Meanwhile, an obvious correlation is found between microstructure and grain orientation. The stress strain curve of the polycrystal is calculated with fair accuracy from single crystal data, which are weighted according to the volume fraction of the three different types of microstructure, and a good match with the experimental curve has been obtained. [
Fig.2 Typical characteristics of three types of microstructure in polycrystalline copper after deformation at ε=0.14 (TEM micrograph taken in section parallel to tensile axis) (a) —Type Ⅰ microstructure; (b) —Type Ⅱ microstructure; (c) —Type Ⅲ microstructure
Fig.4 Experimental and calculated true stress-strain curves for copper sample investigated (approximate form of Taylor corrected [111] single crystal curve is also plotted)