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In the paper, the effect of different solution and aging treatment on microstructure and properties of Cu-Ni-Co-Si alloy is investigated in detail. The results show that the recrystallization, grain growth and second phase solubilization are observed during the continuous solution treatment on line of Cu-Ni-Co-Si alloy. When the Cu-Ni-Co-Si alloy is solutioned at 970 °C and speed of annealing is 10 m/min, aged at 500 °C for 8 h, 40 % cold roll and aged at 325 C for 12 h, it has the excellent comprehensive properties, which can meet the needs of high-end lead frame and connectors. The Disk-shaped precipitates have been confirmed as (Ni, Co) 2 Si phase. The crystal orientation relationship between matrix and precipitatesis[ ( 2 ¯ 2 ¯ 1 ) p | | ( 200 ) Cu , [ 102 ] p | | [ 001 ] Cu .

Effect of Heat treatment on microstructure and properties of Cu-Ni-Co-Si alloy