ζ阶段的快速的生长行为被调查了在在使 Cu-14%Ge, Cu-15%Ge, Cu-18.5%Ge 和 Cu-22%Ge 的实验凉下来下面合金。四篇作文的合金获得 202 的最大的 undercoolings K (0.177T_L ) , 245 K (0.20T_L ) , 223 K (0.20T_L ) 和 176 K (0.17T_L ) 分别地。作为 Ge 增加的内容,微结构转变“α( Cu )树突+ζ 包晶体的阶段→ ζ 包晶体的阶段→ ζ 树突+(ε+ζ)eutectic ”发生在合金在在冷却下面小,当时微结构转变“碎裂的α( Cu )树突+ζ 包晶体的阶段→ ζ 树突+ε 分阶段执行的包晶体的阶段→ ζ ”发生在在冷却下面全体的合金。α树突的稳固的溶解度,它在ζ在 Ge 内容导致减少作为在冷却下面分阶段执行的那在冷却下面扩大的在包晶体的阶段显示的ζ满意的 Ge 的版本分析增加。在 Cu-18.5%Ge,合金ζ填写了包晶体的阶段,当时,在ζ的 Ge 内容分阶段执行增加在冷却下面增加,它在冷却效应下面高由于谷物边界由上的 Ge 丰富的抑制。
Rapid growth behavior of ζ phase has been investigated in the undercooling experiments of Cu-14%Ge, Cu-15%Ge, Cu-18.5%Ge and Cu-22%Ge alloys. Alloys of the four compositions obtain the maximum undercoolings of 202 K(0.17TL), 245 K(0.20TL), 223 K(0.20TL) and 176 K(0.17TL), respectively. As the content of Ge increases, the microstructural transition of "a(Cu) dendrite + ζ" peritectic phase → ζ" peritectic phase →, ζ dendrite + (ε+ζ) eutectic" takes place in the alloy at small undercooling, while the microstructural transition of "fragmented α (Cu)dendrite + ζ peritectic phase →, ζ peritectic phase →ζ dendrite + ε phase" happens in the alloy at large undercooling. EDS analysis of the Ge content in peritectic phase indicates that undercooling enlarges the solid solubility of ζ rdendrite, which leads to a decrease in the Ge content in ζ phase as undercooling increases. In the Cu-18.5%Ge alloy composed of ζ peritectic phase, the Ge content in ζ phase increases when undercooling increases, which is due to the restraint of the Ge enrichment on the grain boundaries by high undercooling effect.