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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.
For a fourth generation Ni-based single crystal superalloy containing 3% Ru (mass fraction), the γ ’phase size and distribution, subgrain and mosaic structure, γ / γ’ Phase mismatch degree, γ ’phase volume fraction, etc. The results of X-ray diffraction experiment show that the alloy is not a complete single crystal alloy, but the average orientation deviation of many adjacent is about 0.5 °, the maximum The orientation deviation is about 3 ° subgrain composition, subgrain subgrain boundaries exist each sub-crystal is composed of a large number of mosaic structure, the mosaic structure between the orientation deviation of 0.1 ° -0.2 ° experimental results show that The average γ ’phase size of this alloy is 0.39μm, the average γ’ phase volume fraction is 69.5%, the average γ / γ ’ The mismatch degree of the two-phase lattice is -2.0 × 10 ~ 3. The evolution of the microstructure of the heat-treated alloy is discussed.