Influence of ageing heat treatment on microstructure of aluminum silicon alloy
DOI:
https://doi.org/10.17533/udea.rcm.327999Keywords:
Al-Si alloy, solution heat treating, aging heat treatingAbstract
Aluminum-silicon (Al-Si) cast alloys with Mg and Cu has susceptibility to solution and ageing heat treatments that improve the mechanical properties and its application is expands. This paper presents the results of the study of the effect of solution and ageing heat treatments of an aluminum-silicon (Al-Si) alloy on microstructure. The alloy was produced using an electric crucible furnace and poured into green sand molds to obtain Y blocks. A chiller was placed in the bottom of the mold to get directional solidification, which generates a variation in grain size. Samples taken close and far from the chiller with different grain sizes were solubilized at 510°C for 8 hours and then artificially aged at 160°C for 4, 8, 12 and 16 hours. Microstructural characterization was performed using optical microscopy (MO) and scanning electron microscopy (SEM) techniques, and hardness measurement were performed. The results showed the effects of solution and ageing conditions, on the microstructure and hardness of the alloy.
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