一种含Ru镍基单晶高温合金的组织特征

金属学报, 2012, 48(5): 569-574. doi: 10.3724/SP.J.1037.2011.00629

一种含Ru镍基单晶高温合金的组织特征

谭喜鹏 , 刘金来 , 宋小平 , 金涛 , 孙晓峰 , 胡壮麒

1.1. 中国科学院金属研究所, 沈阳 1100162. 中国科学院研究生院, 北京 100049>

基金项目: 国家重点基础研究发展计划项目2010CB631200和2010CB-631206以及国家自然科学基金项目50931004资助

关键词：单晶高温合金 , Ru , subgrain , mosaic structure , misfit , γ' volume fraction

MICROSTRUCTURAL CHARACTERIZATION OF A Ru-CONTAINING SINGLE CRYSTAL NICKEL-BASED SUPERALLOY

TAN Xipeng , LIU Jinlai , SONG Xiaoping , JIN Tao , SUN Xiaofeng , HU Zhuangqi

Keywords： single crystal superalloy , Ru , 亚晶 , 嵌镶结构 , 错配度 , γ'体积分数

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'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 0.39 μm, 平均γ'相体积分数为69.5%, 平均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.

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 of γ' phase increases and the γ' lattice misfit decreases. It is shown that the average size of γ' phase is 0.39 μm, the average γ' volume fraction 70% and the average γ' lattice misfit --2.0×10$^-3. The evolution of this microstructure was also briefly described.

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