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中文摘要：
对一种含3%Ru（质量分数,下同）的第四代镍基单晶高温合金的热处理态组织中的γ′相尺寸及分布情况、亚晶及嵌镶结构、γ/γ′两相点阵错配度、γ′相体积分数等进行了表征.X射线衍射实验结果表明,该合金不是一种完整的单晶合金,而是由许多相邻平均取向偏差为0.5°左右、最大取向偏差为3°左右的亚晶组成,亚晶存在亚晶界.每一个亚晶又是由大量的嵌镶结构组成,嵌镶结构之间的取向偏差为0.1°-0.2°.实验结果表明,这种合金的热处理态组织中存在明显的组织不均匀现象,呈枝晶状分布.该合金的平均γ′相尺寸为0.39μm,平均γ′相体积分数为69.5%,平均γ/γ′两相点阵错配度为-2.0×10~3.讨论了这种合金热处理态组织的演变规律.
英文摘要：
The microstructure of a Ru-containing single crystal nickel-based superalloy,which is a potential fourth generation single crystal nickel-based superalloy heat treated,has been investigated. The X-ray diffraction（XRD） results indicate that this single crystal superalloy is not a perfect monocrystal,which is comprised of many subgrains with an average neighboring misorientation difference about 0.5°and the maximum misorientation deviation about 3°;and each subgrain includes large numbers of mosaic structures with misorientation difference of 0.1°—0.2°between each other.It is found that the microstructure of the heat treated alloy is of heterogeneity,where the volume fraction ofγ＇ phase increases and theγ/γ＇ lattice misfit decreases.It is shown that the average size ofγ＇ phase is 0.39μm,the averageγ＇ volume fraction 70%and the averageγ/γ＇ lattice misfit -2.0×10~（-3）.The evolution of this microstructure was also briefly described.
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