| In recent years, as China’s multiple units train, high-speed rail construction has entered a stage of rapid development, the study of high strength and high conductivity copper alloy is facing new opportunities and challenges. ECAP technology as a new type of plastic processing methods can make material dramatic plastic deformation without changing the size of the case sample, grain refinement in order to effectively improve tissue distribution, and ultimately improve strength and hardness properties of the material.This paper studies the trends of per pass microstructure and mechanical properties of Cu-Cr-Zr alloy after eight times ECAP extrusion process, as well as the pros and cons of different material properties extrusion route. We explored the mechanism causing the outcome. Furthermore, we explored a lot of experiments to reveal the parameters of a heat treatment between each extrusion pass. We obtained the best heat treatment temperature and holding time which can make sure to get a minimum hardness of the material at the same time controlling the grain size, prepare for the next pass ECAP experiments.Experiment use Cu-Cr-Zr alloy as experimental materials, through the ECAP samples of each pass a lot of tests showed its grain size, microhardness and tensile strength with cumulative squeeze passes continuously improve while the first pass effect of improving squeeze the most obvious. Through the study of each extrusion route to find a route relative to the other three routes, route C has the weakest grain refining effect; the other three route of grain refinement effect is quite. However, in terms of increasing the hardness and tensile strength and Bc path A path has its own advantages. Through the study of the heat treatment of material after ECAP for one passes we knew that heat treatment at540℃insulation2h material can get the best overall performance.In this paper come to this conclusion for a more detailed mechanistic studies to carry out more in-depth later ECAP theory provides the basis for research and exploration. |
