Microstructural Evolution of Cast Mg-Al-Ca Alloy during Friction Stir Processing
A thixomoulded magnesium alloy containing thermally stable Al2Ca phase was friction stir processed, and its microstructure and mechanical property were investigated. In friction stir zone, the cast structure of the base metal is replaced by fine magnesium grains containing fine dispersoides of Al2Ca. Due to the refined grain size of 0.8-1 μm, hardness of friction stir zone is higher than that of base metal. Texture was developed at top and bottom surfaces, (0002) being parallel to the plate surface, whereas (0001) plane is randomly oriented in the center of friction stir zone.
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
D. T. Zhang et al., "Microstructural Evolution of Cast Mg-Al-Ca Alloy during Friction Stir Processing", Materials Science Forum, Vols. 539-543, pp. 3739-3744, 2007