Trace Rare Earths CuCrSnZn Alloy Strengthening Process And Thermal Deformation Behavior

Cu-Cr-Sn-Zn, Cu-Cr-Sn-Zn-Ce, and Cu-Cr-Sn-Zn-Y alloys were melted in thispaper.Different solid solution temperature, aging time and temperature, degree ofdeformation before aging, and two-step cold rolling and aging for the Cu-Cr-Sn-Zn, Cu-Cr-Sn-Zn-Ce, and Cu-Cr-Sn-Zn-Y alloys performance were studied through thedifferent deformation heat treatment process. The results show that the effects ofdifferent deformation heat treatment process on the alloy hardness, electric conductivityand softening temperature are obvious, and the properties of alloys are improvedobviously with the rare earth elements. After920℃solution by1hâ†'40%deformationâ†'aged at500℃for2hâ†'40%deformationâ†'aged at480℃for1.5hâ†'20%rolling processing, the Cu-Cr-Sn-Zn-Y alloy has good comprehensive performance.The hardness can reach171.7HV, and electric conductivity is72.1%IACS. Thesoftening temperature is505℃.The high temperature compression test of Cu-Cr-Sn-Zn-Ce and Cu-Cr-Sn-Zn-Yalloy were carried out by Gleeble-1500D thermal simulation test machine. The strainrates were0.01,0.1,1,5s^-1. The deformation temperatures were600,700,800℃. Themaximum deformation degree was0.6. The results show that the flow stress declineswith deformation temperation rising. The flow stress increases with strain rateincreasing. With low strain rate, hot compressive deformation flow stress hasnoticeable peak stress at700℃and800℃, and the continuous dynamicrecrystallization characteristic is obvious. The dynamic recrystallization microstructureof the alloy is influenced by the deformation temperation. The thermal deformationactivation energy （Q） and flow stress equation are got by the correlation of flow stress,strain rate and temperature. Dynamic recrystallization of Cu-Cr-Sn-Zn-Ce, Cu-Cr-Sn-Zn-Y alloy was analyzed by work hardening rate method, and dynamic recrystallizationcritical point were calculated through this method. The microstruture of Cu-Cr-Sn-Zn-Ce, Cu-Cr-Sn-Zn-Y alloy after hightemperature compression deformation were observed through optical electronmicroscopy and scanning electron microscope. It is found that the microstruture of alloyis changed from fibrous into uniform equiaxed grains with the increase of deformationtemperature and the decrease of strain rate.