2007 Volume 48 Issue 8 Pages 2002-2007
Uniaxial compression tests were conducted on Al-3 mass%Mg alloy and Al-3 mass%Mg-0.2 mass%Sc alloy under various amounts of strain and strain rate at 723 K. High temperature yielding phenomena were observed at 723 K and strain rates ranging from 1.0×10−4 s−1 to 5.0×10−3 s−1. Texture examination elucidated that fiber textures were constructed in all the deformation conditions. Texture measurement revealed that the main component of the fiber texture changed from {011}+{001} to {001} with an increase in strain when the viscous motion of dislocation is the dominant deformation mechanism in the binary alloy. Texture changes are also seen at strength of the {001} component in the binary alloy that increased with increase in strain rates between 5.0×10−4 s−1 and 5.0×10−3 s−1 up to a strain of −1.0, while in the ternary alloy, neither variation of the pole density at (011) nor (001) in inverse pole figure is observed in the same deformation conditions. It is considered that Al3Sc precipitates contribute to the suppression of grain boundary migration. This means that the grain boundary migration contribute to the development of {001} fiber texture.
