The Cu-Ni-Si-Mg alloy was treated by aging after varying cold deformation. The effect of cold deformation, aging temperature and aging time on the microstructure and properties of the alloy were investigated. The results indicate that the alloy produce a larger number of slip bands and dislocations after cold deformation, it can accelerate the precipitation of phase during aging, improve the microhardness and electrical conductivity. The microhardness and electrical conductivity of the alloy with 80% deformation aging at 723 K for 1h are 242HV and 35.53%IACS, respectively. The volume fraction of the precipitated phase was calculated by measuring the electrical conductivity of the alloy with 80% deformation aging at 773 K, then both the equations of phase transformation and the electrical conductivity equation were obtained.
The effects of different extent of cold rolling on the aging properties in Cu-Cr-Sn-Zn alloy are investigated by hardness and electrical conductivity analysis and microstructure TME (transmission electron microscopy) observation of the alloy. The results shows that dislocations provide nucleation site for precipitation during aging treatment, and result in the precipitation hardening effect from a finer size of precipitates. At 60% ratio of cold rolling and aged at 450°Cfor 1h, the hardness and electrical conductivity can reach 171.3HV and 71.5%IACS respectively.
The flow stress behavior of Cu-2.0Ni-0.5Si alloy during hot compression deformation was studied by isothermal compression test at Gleeble-1500D thermal-mechanical simulator.Dynamic recrystallization and dynamic recovery during high temperature deformation have been investigated by means of compression tests in the temperature and strain rate ranges of 873 to 1073 K and 0.01 to 5s-1 under maxium strain of 60%. The results show the flow stress was controlled by both strain rate and deforming temperature,the flow stress decreases with the increase of deforming temperature,while increases with the increase of strain rate.The hot deformation equation is e& = e28.47[sinh(0.013s )]5.52 exp(-245.4´103 / RT ) .
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