中文摘要：

针对AgMeO电触头材料显微组织不均匀的问题，提出了采用累积挤压大变形技术对该类材料进行显微组织均匀化的方法。在介绍大塑性变形技术的起源及累积挤压大变形技术原理的基础上，讨论了累积挤压大变形技术在AgMeO电触头材料组织均匀化方面的应用，结果表明，在现有加工设备的基础上，采用累积挤压大变形技术能够对AgMeO电触头材料的显微组织进行均匀化处理；AgMeO电触头材料制备过程中获得细小或纳米级第二相颗粒是大塑性变形过程中获得显微组织均匀化的保证；大塑性变形强度的选择需要根据AgMeO电触头材料的体系与特性确定。

英文摘要：

Focus on the microstructure non-uniform of AgMeO electrical contact materials, the cumulative extrusion severe plastic deformation methodwas put forward to improve the homogeni- zation of the microstructure. Based on the introduction to the origin and theory of the cumulative extrusion severe plastic deformation method, its application to the microstrueture homogenization of AgMeO electrical contact materials was discussed. Results show that, on the basis of the existing processing equipment, the microstructure of AgMeO electrical contact materials can be homoge- nized by the cumulative extrusion severe plastic deformation method. The fine or nanometer second phase particles obtained in the preparation of AgMeO electrical contact materials are the guarantee of the microstructure homogenization. What＇s more, the intensity of severe plastic defor- mation is selected according to the system and character of AgMeO electrical contact materials.