Research on Heat Treatment Process of Al-10Si-4Cu-0.7Mg Alloy for Automobile
Al-10Si-4Cu-0.7Mg alloy was prepared at 500℃ x5 h solid solution+different time cryogenic+170℃ x8 h aging treatment.The effects of different heat treatment processes on the microstructure and mechanical properties of Al-10Si-4Cu-0.7Mg alloy were studied by SEM,tensile test,hardness test and friction and wear test.The results show that the tensile strength and hardness of Al-10Si-4Cu-0.7Mg alloy in solution+10 h cryogenic+aging state are 358 MPa and 158 HV,respectively,which are 17.4％and 27.4％higher than that of T6 state alloy respectively.In addition,the wear resistance of Al-10Si-4Cu-0.7Mg alloy under high and low load is also higher some extent than that of T6 state alloy.Compared with T6 state Al-10Si-4Cu-0.7Mg alloy,the amount of Si phase in the alloy of solid solution+10 h cryogenic+aging state is obviously increased,which is more fine and uniform,and the undissolved second phase is also obviously refined.
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