CORRELATION BETWEEN MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Al-Si CAST ALLOYS
The influence of microstructure and process history on mechanical behaviour of cast Al-Si alloys is reported.
In the present work, the EN-AC 46000 and 46100 aluminium alloys have been gravity cast using a stepbar
permanent mould, with a range of thickness going from 5 to 20 mm. Metallographic and image analysis
techniques have been used to quantitatively examine the microstructural parameters of the ?-Al phase
and eutectic Silicon. Microstructure has been also correlated with the results coming from the numerical
simulation of the casting process. The results show that SDAS and length of eutectic silicon particles increase
with section thickness, and consequently mechanical properties decrease.