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在Cu-14%Ge,Cu-15%Ge,Cu-18.5%Ge及Cu-22%Ge合金的深过冷实验中研究了ζ相的的快速生长,四种合金分别获得202K(0.17TL),245K(0.20TL),223K(0.20TL)及176K(0.17TL)最大过冷度.随合金中Ge含量的增大,小过冷样品的凝固组织发生“α(Cu)枝晶+包晶相ζ→包晶相ζ→ζ枝晶+(ε+ζ)二元共晶”的转变.大过冷样品的凝固组织则发生“碎断α枝晶+包晶相ζ→包晶相ζ→ζ枝晶+ε相”的转变.对包晶相ζ中Ge含量进行X射线电子能谱分析,证实深过冷扩展了α枝晶的固溶能力,从而使ζ相中Ge含量随过冷度的增大而减小.由包晶相ζ组成的Cu-18.5%Ge合金中由于深过冷抑制了ζ相在晶粒交汇处的成分扩展,ζ相的Ge含量随过冷度的增大而增大.
The rapid growth of ζ phase was investigated in deep subcooling experiments of Cu-14% Ge, Cu-15% Ge, Cu-18.5% Ge and Cu-22% Ge alloys. , 245K (0.20TL), 223K (0.20TL) and 176K (0.17TL) maximum undercooling.According to the increase of Ge content in alloy, the microstructure of “ Phase ζ → peritectic phase ζ → ζ dendrite + (ε + ζ) binary eutectic. ”In the solidified microstructure of the overheated sample,“ broken α dendrite + peritectic phase ζ → peritectic phase ζ → ζ dendrite + ε phase. ”X-ray photoelectron spectroscopy analysis of the Ge content in the ζ phase of the peritectic phase confirms that the deep undercooling expands the solid solution ability of the α dendrite, thus making the Ge content in the ζ phase The cold degree increases and decreases.The Cu content in the Cu-18.5% Ge alloy, which is composed of the peritectic phase ζ, inhibits the ζ phase from expanding at the interface of the grain due to deep overcooling.The Ge content of the ζ phase varies with the degree of undercooling Increase and increase.