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A. Malekana, M. Emamy,M. Emamy,J. Ghiasinejad,M.R.Ghorbani 한국소성가공학회 2010 기타자료 Vol.2010 No.6
An isothermal reheating approach was used to study the effect of isothermal holding time on the microstructure of Al-Mg₂Si in-situ cast composite. Process temperature was selected at 590℃ which is in the semi solid state with respect to the phase diagram of Al-Mg₂Si system. The morphology of primary Mg₂Si particles was identified as irregular shape. The microstructures of the composite at two different states of reheated and as-cast, were compared to reveal the degree of particle modification. The results showed that higher holding time have more significance influence on the nodularity and also decreasing the size of primary Mg₂Si particles. An optimum time was also obtained for isothermal reheating processwhich can be affected by different parameters discussed in this work.