Effect Of Rare Earth Element Ce On The Structure And Properties Of CuNiCoBe Alloy

In this subject,six different compositions of CuNiCoBeCe alloy with rare earth element Ce content ranging from 0.00wt%to 0.10wt%were prepared.For the six alloys prepared,the process tests of solution treatment and aging treatment were carried out.The electrical conductivity and hardness of the six alloys after solution treatment and aging treatment under different process parameters were tested,and the six alloys were obtained.Corresponding to the appropriate process parameters of solution treatment and aging treatment,the tensile properties,softening temperature and friction and wear properties of the six alloys were tested.Using SEM,EDS,XRD and other analytical testing methods to study the microstructure and phase composition of the alloy,tensile fracture and morphology and damage mechanism of the alloy after wear,the effect of rare earth element Ce on the structure and properties of the alloy was analyzed and deduced The phase transition kinetics equation and conductivity equation of six alloys aged at different temperatures are presented.The results show:The rare earth element Ce will form Co₅Ce,CeNi₅ and other high melting point metal compounds in the solidification process of the alloy,which preferentially precipitates in the liquid phase,so it has a certain improvement effect on the structure of the alloy ingot.The addition amount of Ce is most suitable at about 0.04wt%.Under the same aging process parameters,the conductivity of the alloy after aging increases first and then decreases with the increase of Ce content,and the hardness of the alloy increases with the increase of Ce content.The softening temperature of the alloy increases with the increase of the content of Ce in the rare earth element.The static tensile strength of the alloy decreases with the increase of the tensile test temperature.When stretched at room temperature and 200?,the tensile strength of the alloy increases first and then decreases with the increase of the content of rare earth element Ce.The alloy with a Ce content of 0.04wt%has the highest tensile strength,and the tensile strength at room temperature The Rm reaches 847 MPa,and the tensile strength Rm at200? hardly changes,being 844 MPa.When stretched at 400?,the tensile strength of the alloy increases with the increase of the Ce content of the rare earth element.The highest tensile strength is the alloy with Ce content of 0.10wt%,Rm is 792 MPa,the tensile strength of the six alloys Compared with the tensile strength at room temperature,the strength decreased significantly.Under the test conditions of this subject,the wear mechanism of the alloy is mainly a combination of abrasive wear or fracture wear,contact fatigue damage and abrasive wear.The alloy with Ce content of 0.04wt%has the best wear resistance,the lowest friction coefficient at room temperature,and the lowest wear rate.Based on the experimental data,the phase transition kinetics equation and the conductivity equation of CuNiCoBeCe alloys with different Ce contents at different temperatures are derived.The calculated conductivity value according to the conductivity equation is not much different from the measured conductivity value.