Effect of cold rolling and aging process on microstructure and properties of Cu-1.8Ni-0.9Co-0.641 Si alloy sheet and strip was studied.The effects of liquid nitrogen cold rolling and room temperature cold rolling on the properties of the alloy sheet were compared,and the mechanism was analyzed by X-ray diffractometer(XRD),scanning electron microscope(SEM)and transmission electron microscope(TEM).The results show that when the aging time is 60 min,the hardness of alloy sheet reaches the maximum after cold rolling at room temperature and low temperature,which are 285.53 HV0.3 at 450℃and 307.2 HV0.3 at 400 ℃,respectively.It is also found that the conductivity of the alloy increases with the increase of aging temperature.After aging at 500 ℃,the conductivity of the low temperature cold rolled alloy is the highest,reaching 60.11％IACS.During the aging process,the dislocation density in the sheet decreases,and a large number of fine and uniform nanoscale(Ni,Co)2Si ordered phases appear in the grains and on the grain boundaries.Compared with cold rolling at room temperature,the microstructure of the Cu-Ni-Co-Si alloy after low temperature cold rolling is finer and the dislocation density is higher.
Cu-Ni-Co-Si alloylow temperature cold rollingagingmicrostructuremechanical properties
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