Abstract:The evolution of microstructure, textures, and mechanical properties of thin-walled copper tube during heat treatment was investigated using EBSD technique and tensile test. The results show that the initial deformation textures of pre-drawn thin-walled copper tube are mainly composed of Copper and Y components, while with the increase of temperatures, the textures are transformed into a strong Goss texture gradually. The high-resolution microstructural characterizations indicate that the new Goss recrystallized grains nucleate and grow up within the deformed Copper grains and Y grains in different mechanisms, respectively. The tensile strength of the thin-walled copper tube decreases gradually with the increase of the temperature, while the elongation increases first and then decreases sharply due to the action of grain sizes and texture components.

Key words: thin-walled copper tube; recrystallization behavior; Goss texture; nucleation mechanism; annealing twin