Effect of T6 heat treatment on microstructure and mechanical properties of high pressure die cast ADC12 aluminum alloy was studied.The results show that after solution treatment at 510 ℃ for 1 h and artificial aging at 200 ℃ for 6 h,the microstructure of the ADC 12 aluminum alloy die casting is composed of fine eutectic structure and α solid solution,where the fine eutectic structure is formed during the high pressure die casting process.After heat treatment,eutectic Si phase and Al2Cu phase in the aluminum alloy mainly exist as approximately spherical particles.After T6 heat treatment,the transition phase of the aluminum alloy die casting completely precipitates from the matrix phase,forming a stable θ phase and an α solid solution.After solution treatment at 510 ℃ for 1 h and artificial aging at 200 ℃ for 6 h,the hardness of the ADC12 aluminum alloy die casting reaches the maximum,being 128 HBW,this is caused by the precipitation strengthening phase Al2Cu,which makes the supersaturated solid solution has a special crystal structure.
high pressure die castingADC12 aluminum alloyT6 heat treatmentmicrostructuremechanical properties
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