Saturation Dislocation Microstructures of Double-slip-oriented Copper Single Crystal during the Corrosion Fatigue in a 0.5 mol/L NaCl Aqueous Solution

摘要

Copper single crystal specimens with the longitudinal axis parallel to the [013] double-slip-orientation were grown through Bridgman technique. The fatigue tests were performed using a symmetric tension-compression load mode at room temperature in an open-air and a 0.5 mol/L NaCl solution, respectively. The dislocation microstructures were observed with scanning electron microscopy (SEM) by the electron channeling contrast (ECC) and transmission electron microscopy (TEM). The results show that the saturation dislocation microstructures during the corrosion fatigue in the aqueous solution of 0.5 mol/L NaCl, mainly consisted of labyrinth, wail and vein dislocation structures, which differs from the dislocation structures of the wails and veins in an open-air environment.