ECAP变形铜锰合金的微观组织和力学性能

为研究Mn元素对铜合金的变形机制和力学性能的影响，在室温下对纯铜和铜锰合金（Cu-5Mn）进行等通道转角挤压（ECAP）。结果表明， Mn元素的添加使得铜锰合金的短程有序度增加，平面滑移倾向变强，促进了变形过程中的位错积累，刺激大量滑移带形成，且局部应力集中效应诱发变形孪晶产生，因此铜锰合金的晶粒细化效果优于纯铜，晶粒尺寸约为400 nm。位错强化、细晶强化、孪晶强化和固溶强化的共同作用，使得ECAP铜锰合金的力学性能显著提升，抗拉强度高达482 MPa，从而为高性能靶材的制备提供了一种有效方法。

Microstructure and Mechanical Properties of Cu-Mn Alloys Prepared by Equal Channel Angular Pressing

To investigate the effects of Mn element on the deformation mechanism and mechanical properties of Cu alloys, equal channel angular pressing (ECAP) was performed on pure copper and Cu-5Mn alloys at room temperature. The results showed that with the addition of Mn element, the short-range order degree increased and the planar slip of dislocations became stronger, which promoted the dislocation accumulation during the ECAP process, the formation of a large number of sliding bands, and the deformation twins was formed due to the localized stress concentration, which makes the grain refinement effect of Cu-5Mn alloy better than that of pure Cu, and the grain size was refined to about 400 nm. Under the combination effects of solid solution strengthening, grain refinement strengthening, twinning strengthening and dislocation strengthening, the mechanical properties of the Cu-5Mn alloy after ECAP was significantly improved, and the ultimate tensile strength was as high as 482 MPa, which provides an effective method to prepare the high-quality sputtering target.