Effect of alloy composition, stacking fault energy, second phase particles, initial thickness, and measurement position on deformation texture development of nanostructured FCC materials fabricated via accumulative roll bonding process

Abstract

In the present work, the effective parameters on deformation texture development of nanostructured face-centered cubic (FCC) materials fabricated via accumulative roll bonding (ARB) process were investigated. Textural evolution was evaluated using X-ray diffraction and microstructural observation was evaluated by transmission and scanning electron microscopy. It was found that the extensive continuous recrystallization was occurred at fourth cycle (for AA1100 alloy) and sixth cycle (for AA5083 alloy) and this phenomenon led to decrease in the orientation intensities of β-fiber. The major characteristic difference between the aluminum (representing the high stacking fault energy (SFE)) and the brass (representing the low SFE) textures lied in the prominence of the Copper component in the aluminum texture and the absence of this component in the brass texture. The results also revealed that the discontinuous recrystallization was occurred in the brass sample at all cycles and this phenomenon led to decrease in the orientation intensities of β-fiber, Copper, and Dillamore textures. The intensity of texture was very weak in the composites than in the pure aluminum due to the formation of a deformation zone near large second phase particles and also occurrence of particle stimulated nucleation (PSN) during ARB process. There was a texture transition from rolling textures to Rotated Cube component in both aluminum strip and foil samples. But, the texture transition in the aluminum foil occurred sooner than in the aluminum strip. The texture near the quarter thickness showed a typical rolling texture, and the texture near the surface presented a shear one. Due to the effect of friction between the roll and the sample contact surface, the texture evolution at the surface layer was different from that at the quarter thickness layer.