Effect of pre-rolling-annealing on microstructure and mechanical properties of Cu-7.5Sn-0.1P strip
The cast Cu-7.5Sn-0.1P alloys were pre-rolled followed by homogenization annealing,and investigated using XRD,OM,SEM,EDS,EPMA and tensile testing,etc.The effects of pre-rolling deformation and annealing temperature on the microstructure and mechanical properties of the alloys were studied.The results show that the pre-rolling can lead to fragmentation of dendrite structure of the Cu-7.5Sn-0.1P alloy,which may promote the elimination of Sn segregation structure at lower annealing temperature.By comparison with the alloy subjected to direct annealing,the pre-rolled-annealed alloy has finer grain size,higher strength and maintains good plastic deformation capability.The final 0.2 mm thick finished strip produced by cold rolling of the pre-rolling-annealing alloy with 44%deformation is significantly higher in strength and maintains better plasticity by comparison with strips prepared by common procedures.The tensile strength and elongation for the finished strip made from the pre-rolling-annealing alloy with 44%deformation reach 1005 MPa and 19.3%,respectively.
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