Effect of thermomechanical treatment on microstructure and properties of Cu-Ni-Si alloy
Effect of cold rolling deformation and aging on microstructure and properties of Cu-Ni-Si alloy was studied by means of scanning electron microscopy,electronic universal testing machine,Vickers hardness tester and digital eddy current metal conductivity tester.The results show that the larger the deformation of the cold-rolled alloy,the longer and flatter the grains in the microstructure are pulled along the rolling direction.When the aging temperature or aging time increases to a certain extent,the cold deformed grains undergo recovery and recrystallization,and the recrystallized grains gradually grow as the aging time continues to increase.The fracture mode of the cold-rolled alloy is dominant by brittle fracture,while the aged alloy is dominant by ductile fracture.When the cold rolling deformation is 80.0％and then after aging at 500 ℃ for 1 h,the comprehensive performance of the alloy is the best,with the electrical conductivity of 46.37％IACS,the microhardness of 236.14 HV0.1,the tensile strength of 638.24 MPa,the yield strength of 581.55 MPa,and the elongation of 5.77％.
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维普
