采用熔融玻璃净化技术 ,使大体积Cu70Ni30合金获得 2 70K深过冷 ,在宽过冷范围内合金不同过冷度区间的凝固组织演化表明 ,存在 2类晶粒细化和 2类不同的枝晶花样。其中 ,介于 38K～ 12 0K过冷区间 ,由于再辉过程中的化学过热 ,首先发生了枝晶熔断 ,熔断后的枝晶段在界面能驱动下 ,通过晶界移动形成了第一类晶粒状晶 Using molten glass purification technology, the large-volume Cu70Ni30 alloy was subjected to 2 70 K deep subcooling. The evolution of the solidified microstructure in different undercooled sections in a wide range of supercooling showed that there are two kinds of grain refinement and two kinds of different dendrites Pattern. Among them, between 38 K and 120 K, due to chemical overheating in the reflow process, dendritic fusing occurs first, and after detonation, the dendrite segments are driven by the interface and form the first type of crystal through the grain boundary movement Granular crystal