Effects of T5 Heat Treatment on Microstructure of High Vacuum Die Casting Al-10Si-Cu-Mg-Mn Alloy
Al-10Si-Cu-Mg-Mn alloys with different Cu contents were prepared by high vacuum die casting process.The microstructure of as-cast and T5 alloys were investigated by OM,SEM and TEM.The results indicated that the microstructure of as-cast alloys consists of α-Al,eutectic Si and α-Fe,Q and θ phases.With the increase of Cu con-tent,the number of Q phase keeps stable,and the morphology is mainly lamellar.The amount of θ phase is gradually increased,and the morphology is changed from dispersed granular to aggregated blocky.T5 heat treatment cannot change phase types and morphology,and the main precipitated phases are β″ and θ′ phases at peak aging condition.With a lower Cu contents,the precipitated phase is dominated by β″ and at higher Cu contents,the precipitated phase is dominated by θ′.
Al-10Si-Cu-Mg-Mn AlloyHigh Vacuum Die CastingT5 Heat TreatmentMicrostructure
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