Fluidity and Fatigue Properties of Aluminium-silicon Eutectic Alloy Subjected to Modification and Vibration during Solidification

摘要

Aluminium-silicon eutectic alloys (LM-6) is widely used in automobile and aerospace industries due to its high strength-to-weight ratio, excellent corrosion resistance, wear resistance, good castability etc. Modification is a treatment used to strengthen this alloy. this paper describes changes in fatigue behaviour and fluidity of this alloy when subjected to modification and vibration during solidification. In this work LM-6 alloy was modified using permanent modifier strontium (Sr). Standard fluidity spiral and test specimens for fatigue test were prepared according to ISO specifications. Adopting normal melting practice and modification, the modified alloy was subjected to vibration at different frequencies during solidification. Fluidity and fatigue strength of the alloy subjected to modification and modification with vibration were studied. Results revealed that fluidity decreased with modification and increased with vibration giving optimum values at 10 Hz frequency. Fatigue strength increased with modification and further increased with vibration giving optimum values at 15 Hz frequency.