Research And Copper Chromium Zirconium Copper Zirconium Alloy Microstructure And Properties

The effects of different cold deformations and aging treatments on the microstructure and properties of Cu-Zr and Cu-Cr-Zr alloy were studied by hardness test, tensile test, optical microscopy, scanning electron microscope and Transmission electron microscope analysis. Concludes the best process of alloy that in the conditions of the different cold deformation and aging treatment, and the optimum processing parameters were obtained. The results show that:1) Cold deformations and aging treatments can significantly improve the mechanical properties of the Cu-Zr and Cu-Cr-Zr alloy, where the cold deformation processing plays a major role to improve the strength of the alloy.After the cold deformation treatment, as the degree of deformation increases, the strength and hardness increased, elongation decreased, but the electrical conductivity is substantially constant.2) In the different cold deformation conditions of Cu-Zr and Cu-Cr-Zr alloy, the reasonable aging treatment were:450℃/4h with30%and50%cold deformation; and450℃/2h with70%cold deformation.3) under the transmission electron microscope, large number of dislocations are observed in the two alloys after the cold deformed state; with the increase of the degree of deformation, dislocation density increases and dislocation tangling become more obvious4) After aging treatment, the Transmission organization of the Cu-Zr alloys have fine particles precipitate dispersively, the dislocation is not completely eliminated; Two types of particles present in the transmission organization of Cu-Cr-Zr alloy:One is coarse while the other is fine and evenly distributed; the former one is rich in copper, chromium and zirconium. Fine precipitated particles to a certain extent increase the strength and hardness of the alloy.