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研究了过冷0～210K的Cu－30Ni（原子百分数）合金的组织演化规律．在105～155K的过冷范围内实现了自由生长枝晶的单向凝固，获得了单向凝固的单晶组织.深过冷熔体的微观净化和单向快速凝固，有效地去除了合金中的微细夹杂物，减少了宏观偏析和校晶偏析，显著改善了材料的均匀性，在拉应力作用下材料从沿晶断裂转变为穿晶断裂与常规铸态组织相比，其延伸率、极限抗拉强度和0．2％屈服强度分别提高到原组织的25倍、3倍和1．3倍
The microstructure evolution of Cu-30Ni (atomic percent) alloy under 0 ~ 210K undercooling was studied. Unidirectional solidification of free-growth dendrites was achieved within the supercooled range of 105 ~ 155K, and the unidirectionally solidified single crystal structure was obtained.Micro-purification and one-way rapid solidification of deep subcooled melt effectively removed Of the micro-inclusions, reducing the macro-segregation and segregation of school-like crystals, significantly improving the uniformity of the material under the tensile stress the material from intergranular fracture to transgranular fracture compared with the conventional as-cast microstructure, the elongation, the limit Tensile strength and 0.2% yield strength were increased to 25 times the original organization, 3 times and 1.3 times