As-cast Al-Si-Mg-B-Sr alloy was homogenization annealed under different temperatures and holding time.The effects of different homogenization annealing processes on microstructure,hardness and conductivity of the Al-Si-Mg-B-Sr alloy were studied by means of microstructure observation,hardness test and conductivity test.The results show that the microstructure of as-cast alloy has certain segregation phenomenon.After homogenization annealing at 550 ℃ for 9 h,the microstructure of the alloy is uniform and the segregation is basically eliminated.With the extension of homogenization annealing time,the hardness of the alloy increases first and then decreases,and the conductivity gradually increases.The hardness of the Al-Si-Mg-B-Sr alloy homogenization annealed at 550 ℃ for 9 h is the highest,which is 74.5 HV0.5.The conductivity of the alloy homogenization annealed at 550 ℃ for 15 h is the maximum,reaching 55.9％IACS.
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