Effect of rare earth addition on microstructural,mechanical and electrical characteristics of Cu-6% Fe microcomposites

Cu-6%Fe（mass fraction） microcomposites containing（0-0.30）% rare earth elements were prepared by cold drawing and intermediate heat treatments.Microstructure was observed, and mechanical properties and electrical conductivity were measured for alloys at various drawing strain levels.Adding rare earth elements could reduce the size of primary Fe and Cu dendrites of Cu-6%Fe.Ultimate tensile strength increased but electrical conductivity decreased with the increase of drawing strain.Rare earth additions in Cu-6%Fe slightly increased the strength at low strain and effectively improved the conductivity at high strain.Both strain hardening rate and conductivity loss of Cu-6%Fe containing rare earths were reduced at lower strain than Cu-6%Fe.

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。