模压形变对纯铜组织和性能的影响

Effect of groove pressing on microstructure and properties of pure copper

采用交叉模压形变法对纯铜进行不同道次的形变处理,研究交叉模压形变对纯铜显微组织和力学性能的影响。研究结果表明:交叉模压形变可以较有效细化纯铜晶粒尺寸,交叉模压10道次后,平均晶粒尺寸减小63%;材料在塑性变形初期(2道次)细化效果最明显,经相同道次交叉模压形变后,晶粒细化效果逐渐减低;交叉模压变形后纯铜试样的显微硬度和抗拉强度均得到显著提高,但是伸长率下降,硬度值和抗拉强度分别提高了96.4%和31.9%,伸长率由66.67%下降至12.25%。

Pure copper was deformed by the constrained groove pressing technology, and the influences of groove pressing on microstruc- ture and mechanical properties of pure copper were studied. The results show that the constrained groove pressing is an effective way of re- fining the grain size of pure copper, and the average grain size of pure copper decreases by 63% after 10 passes. At the beginning of plas- tic deformation （2 passes） , the effect of refining is most obvious, after the same passes of the constrained groove pressing, the effect of re- fining reduces gradually. However, the micro hardness and tensile strength of material increase significantly after the constrained groove pressing, and the elongation of copper decreases. Thus, the hardness and tensile strength of material increase nearly 96% and 32% respec- tively, and the elongation of copper decreases from 66. 67% to 12. 25%.