Microstructural Study on Dynamic Recrystallization and Texture Formation in Pure Nickel

Abstract

Dynamic recrystallization and resultant texture formation were studied by high temperature compressive deformation of pure nickel. Microstructural observation and orientation measurement revealed that grain boundaries become wavy during deformation and the deformation inhomogeneity is enhanced in the vicinity of wavy boundaries where new grains nucleate with random orientation. These grains grow up during deformation and after reaching a certain size new grains are formed again near the grain boundaries of grown up grains. This process occurs repeatedly during dynamic recrystallization. Concerning texture, randomly oriented new grains receive compressive deformation and change their orientation toward the stable orientation for compression (011). However, further grain nucleation occurs in random orientation before they reach (011); grains whose orientations are close to (011) disappear.