考察了镍基单晶合金DD3板试样在厚度为0.5．1.0，2.0mm、晶体取向为[001]、[011]，[111]和[112]以及试验温度为1000、950．850和760℃下的变形和破坏规律.宏观结果表明，厚度效应表现出与温度的相关件：1000℃时，试样越薄，屈服强度越高；950℃以下,试样越厚，屈服强度越高.SEM细观断口形貌分析表明，除1000℃[011]取向试样断口表现出韧窝断裂模式外，其余试样均为小刻面断裂模式,小刻面为滑移面,刻面上的空穴机制对材料的破坏有重要作用.
The deformation and fracture characteristics of nickel-base single crystal superalloys at high temperatures, which are in plates with different thickness and in different crystallographic orientations, have been studied. The macro-results show that the thickness effects are dependent on the test temperature. The strength increases with decreasing thickness at 1000℃, while the strength increases with increasing thickness below 950℃. At 1000℃, the dependence of strength on crystallographic orientation is not distinct. The micro-results show that [001] plate specimens at 1000℃ are in void-related ductile fracture model, and the rest specimens are in micro-face fracture model. And it is confirmed that the microface are crystallographic slip plane, and voids on the faces have important effects on the fracture.
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