Fundamental study on microstructure control by combination of nano plastic forming and annealing

Abstract

This paper reports experiments of static recrystallization using single crystal copper specimens. Single crystal copper specimens were used for the nano-plastic-forming and annealing test. Distortion of crystal lattice around indented grooves was studied by EBSD analysis. It was found that crystal rotation occurred around an indented groove, and that the crystal rotation zone extended obliquely downward from the grooves. TEM micrographs revealed that dislocation cell structures were generated in the vicinity of the grooves when the indentation load is large. After the nano-forming-test, the specimen was annealed under 973K. The specimen was also analyzed by EBSD and TEM. It was found that recrystallized grains were generated in the dislocation cell structures. It is considered that sub-grains in the dislocation cell structure grew up to recrystallized grains. Although more improvement of experimental technique and detailed investigation in the future work is necessary, possibility of accurate microstructure control is shown in the paper. © 2011 American Institute of Physics.