Effects of Dynamic Solidification on Properties of Die-Casted Alloys

Abstract

Gravity die casting using low frequency (0-45Hz) mechanical vibration of aluminium alloys was conducted. In order to improve their microstructure and mechanical properties of aluminium alloys. the vibration given to the mould is in vertical axe. Columnar rod specimen of diameter (10mm, 15mm & 20mm) were produced in vibrating die to investigate the vibrational and cooling effect during casting. The acceleration during the experimentation ranges from 0.5g to 1.5g. During mechanical vibration the rate of cooling increase with increase in vibrational frequency. The dendrite produced in the outer casting region decresed by vibration, and with the increase in vibration frequency it also decreased. The main purpose of vibration is to increase the nucleation and thus produced more homogeneous metal structure. Grain analysis and other mechanical properties were investigated on samples with vibration and without vibration in order to realize the vibration effect.