Study On Properties And Mechanism Of Cu-Zn-Cr

Cu-17Zn-0.4Cr(wt%) alloys which were prepared by half continuous cast way.Through hardness measurement,tensile test at room temperature, electrical resistant test at room temperature, microstructure analysis, XRD analysis, SEM and TEM analysis methods, the mechanical and electric properties and the microstructure of above alloys at different work and heat treatment technologies were studied. Some of them were also analyzed and explained in theory.The results show that:The first,Cu-Zn-Cr alloy is a typical aging strengthening alloy;under this experiment condition,the better technology is that the alloys are rapid hot rolling and quenching(the start rolling temperature is 930℃),then precipitated at 450℃for 1 hour.The second,rapid hot rolling and quenching can hold the effects of working hardening.The third,the alloys have two kinds of strengthening mechanisms.In the initial stage of aging the strengthening mechanism is coherent mechanism ,but the relationship of coherent disappears with the phase grows up in the anaphase of aging,then the alloys' strengthening mechanism is Orowan mechanism.The fourth,electrical conductivity of alloys. was influenced most by solute atoms.we can use the follow equation to calculate the contribution to the alloys of CrFinally,high-conductivity of alloys come from disperse and duplex phase structure.Tt's conducting mechanism can be explained by cubic conducting unit model.