Ⅶ. AlTi5C0.2 series of refiners more prefer to constitutional undercooling. That makes the grain size distribution of refined alloys be more uniform and the structure be more consistent.
Al-Ti-C and Al-Ti-B prefers to different undercooling environments. The aluminum grains refined by Al-Ti-C tend to have a more uniform particle size distribution from the inside to the outside in the casting. While, the aluminum grains refined by Al-Ti-B tend to have smaller grain sizes on the surface and shallow layers of the casting, and the deeper the inside of the casting body, the larger the grain size. Correspondingly, the mechanical properties of aluminum castings refined by Al-Ti-C will be better and more stable.
The grain size distribution at the edge (Edge), the middle radius (D/4) and the center (Middle) of the AA8079 billet refined with 2kg/T (a) Al-Ti-C or (b) Al-Ti-B
Ultimate tensile strength (UTS) of 6063 alloy refined by Al-Ti-C and Al-Ti-B master alloy
The hardness (HB) of 6063 alloy refined by Al-Ti-C and Al-Ti-B master alloy