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Abstract—Grain refinement plays vital role for improving the quality of AA-356 aluminium alloy castings.
The aim of present investigation is to evaluate the grain refinement of AA-356 alloy by inducing
ultrasonic vibrations through the die into the melt during solidification, which was treated at
various frequencies and amplitudes by adding master alloy (Al-5Ti-1B) at different fractions.
Experimental results shows that the columnar dendritic structure was changed into globular
grain structure with reduced in grain size. These grains were obtained when melt was treated
ultrasonically which leads to formation of equi-axed grains, degassing, increase in fluidity,
refinement in phases, improvement in homogeneity, segregation control, uniform distribution of
secondary phases and inclusions. It may imply that from the experiment the cavitations induces
heterogeneous nucleation plays important role than dendrite fragmentation of globular grains.
Due to cavitation phenomenon degassing of hydrogen from the melt during solidification takes
place, due to this the formation small equi-axeed grain structure produced throughout the casting.
Index Terms—AA-356, Master alloy, Ultrasonic vibrations, Nucleation, Cavitations
Cite: Sahadeva G N, A S Ravindran, H R Vitala and T Chandrashaker, "Grain Refinement of AA-356 by Adding AI-5TI-1B Grain Refiner and Inducing Ultrasonic Vibrations during Solidification," International Journal of Mechanical Engineering and Robotics Research, Vol. 3, No. 3, pp. 723-730, July 2014.