对Cu70 Ni30 合金液相线 (1 2 30℃ )以上和液相线以下的液态做了X射线衍射实验 .通过对实验结果的分析 ,揭示了它们之间的主要区别在于原子团的尺寸有较大的差异 :在 1 2 5 0～ 1 40 0℃时原子团的相关半径为 1 .1 2 5nm ,原子团的原子个数约为 45 7;而在过冷液态 (1 2 0 0℃ )时的原子团的相关半径为 1 .3nm ,原子团中原子数量约为 70 4.液态Cu70 Ni30 合金的原子集团的近序为fcc ,其固态fcc结构是由液态的fcc近序保留下来的 X-ray diffraction experiments were performed on the liquid state above the Cu70 Ni30 alloy liquidus (above 1230 ° C) and below the liquidus.The analysis of the experimental results revealed that the major difference between them is that the size of the atomic groups is larger The relative radius of the atomic groups at 115 to 140 degrees Celsius is 1.125 nm and the number of atoms in the atomic group is about 457. In the case of supercooled liquid state (at 1200) Of the relevant radius of 1.3nm, the number of atoms in the atomic group is about 70 4. Liquid Cu70 Ni30 alloy atomic group of the nearest fcc, the solid fcc structure is retained by the liquid fcc close