Morphology evolution of two-phase Cu-Ag alloys under different conditions

有不同 Ag 内容的 Cu-Ag 细丝的微 composites 被冷绘画和中间的热处理准备。微观结构描述和细丝的分发在不同条件下面为二阶段的合金被观察。Cu-Ag 合金的微观结构进化上的重绘画紧张的效果被调查。微观结构部件由 Cu 树突，最容易溶解的殖民地和第二等的 Ag 组成的结果表演在包含 6%∼24%( 集体部分) 的合金猛抛 Ag。随 Ag 内容的增加，在微观结构的最容易溶解的殖民地增加并且逐渐地变成连续网状的分布。Cu 树突，最容易溶解的殖民地和第二等的 Ag 猛抛在一个轴的方向被伸长并且在冷绘画期间发展成合成细丝的结构变丑。最容易溶解的殖民地趋于演变为细丝的捆。细丝的直径随为二阶段的合金拉紧张度的增加减少，特别地为有低 Ag 内容的合金。一旦绘画紧张超过了某个水平，在细丝的直径的减小变得慢。

Cu-Ag filamentary microcomposites with different Ag contents were prepared by cold drawing and intermediate heat treatments. The microstructure characterization and filamentary distribution were observed for two-phase alloys under different conditions. The effect of heavy drawing strain on the microstructure evolution of Cu-Ag alloys was investigated. The results show that the microstructure components consist of Cu dendrites, eutectic colonies and secondary Ag precipitates in the alloys containing 6%-24% （mass fraction） Ag. With the increase in Ag content, the eutectic colonies in the microstructure increase and gradually change into a continuous net-like distribution. The Cu dendrites, eutectic colonies and secondary Ag precipitates are elongated in an axial direction and developed into the composite filamentary structure during cold drawing deformation. The eutectic colonies tend to evolve into filamentary bundles. The filamentary diameters decrease with the increase in drawing strain degree for the two-phase alloys, in particular for the alloys with low Ag content. The reduction in filamentary diameters becomes slow once the drawing strain has exceeded a certain level.