S P Tewari
Indian Institute of Technology (BHU) Varanasi, India
Title: Influence of mold oscillation during solidification on grain size, degree of grain refinement and tensile properties of the A356 and A319 aluminum alloys
Biography
Biography: S P Tewari
Abstract
A356 and A319 aluminum alloys were cast under stationary and oscillation condition. The frequency range selected was 0 Hz to 400 Hz with constant amplitude of 15 μm. It has been observed on the basis of experimental results that intensity of oscillation, in general enhances mechanical properties such as ultimate tensile strength, yield strength and percentage elongation of casting along with reduction of grain size of α-Al. The mechanical and metallurgical properties are appreciably improved at a higher frequency of oscillation. This may be due to the increase in number of nucleation sites because of fracturing of grains due to oscillation. Rapid ejection of heat of molten metal takes place due to mold oscillation at interface during solidification. This brings about grain refinement and modification of eutectic cells in casting.