The Effect of Grain Refiners for Aluminium Alloy Containing Mn-Ti-Sr Dispersoid
The new structural applications of aluminum materials are determined by intelligent lightweight design: the demand of safety, ecology, recycling and by economics. Al-Si alloys allow complex shapes to be cast. Metallurgical a high volume fraction of fine dispersoid which are less about 0.1 microns in size are useful for retaining a fine grain. In the 6061 series of alloys, iron combines with aluminium and silicon to form two types of commune inter-metallic, (beta AlFeSi and alpha AlFeSi).The type of inter-metallic that is present these alloys will have an important bearing on the homogenization time, workability and quality of the surface finish. The microstructure of the as-cast samples was evaluated by electronic microscopy and the morphology of inter-metallic compounds related to the efficiently modification. Mn-Ti-Sr modification of Al-alloys is normally accompanied by an increase in porosity in the casting.
W.J. Poole, M.A. Wells and D.J. Lloyd
V.T. Vacariu et al., "The Effect of Grain Refiners for Aluminium Alloy Containing Mn-Ti-Sr Dispersoid", Materials Science Forum, Vols. 519-521, pp. 449-454, 2006