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采用球磨制得的Ag(Invar)复合粉体制备Cu/Ag(Invar)复合材料。研究烧结及形变热处理后复合材料的显微组织结构与性能。结果表明,在球磨过程中,微锻造焊合与加工硬化断裂共同作用导致Ag(Invar)粉体的平均颗粒尺寸先急剧增大,再快速降低,最后趋于稳定。相对于Cu/Invar复合材料,Cu/Ag(Invar)复合材料的烧结性能大大提高,其中的气孔小而少。形变热处理后,该复合材料近乎完全致密,具有最佳的相成分与元素分布,更重要的是,该复合材料中的Cu及Invar合金均呈三维网络状连续分布。Cu/Invar界面扩散被Ag阻挡层有效抑制,使Cu/Ag(Invar)复合材料的力学及热学性能均有明显提高。
Cu / Ag (Invar) composites were prepared by ball milling Ag (Invar) composite powders. The microstructure and properties of the composites after sintering and heat treatment were studied. The results show that the average particle size of Ag (Invar) powder firstly increases sharply, then decreases rapidly and finally tends to be stable during the process of ball milling by micro-forging welding and work hardening fracture. Compared with Cu / Invar composites, the sintering properties of Cu / Ag (Invar) composites are greatly improved, of which the pores are small and few. After deformation heat treatment, the composites are almost completely densified and have the best phase composition and elemental distribution. More importantly, the Cu and Invar alloys in the composites are continuously distributed in a three-dimensional network. The Cu / Invar interface diffusion is effectively suppressed by the Ag barrier, which enhances the mechanical and thermal properties of Cu / Ag (Invar) composites.