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通过对DD100单晶合金组织、断裂等方面的研究，探讨了影响单晶的断裂延性的因素。当DD100单晶合金中加入适量Hf元素后，单晶合金中无明显的疏松孔洞，γ／γ’共晶数量增加。发生瞬间断裂的不含Hf元素的试样中存在亚晶界、疏松孔洞以及γ／γ’共晶，但亚晶界的危害超过后两者。
Through the study on the microstructure and fracture of DD100 single crystal alloy, the factors influencing the fracture ductility of single crystal were discussed. When adding appropriate amount of Hf element into DD100 single crystal alloy, there is no obvious loose hole in the single crystal alloy, and the number of γ / γ ’eutectic increases. There are subgrain boundaries, loose pores and γ / γ ’eutectic in Hf element without instantaneous fracture, but the subgrain boundaries are more harmful than the latter two.