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研究了不同Ru含量(质量分数,0%和2%)的高Re镍基单晶高温合金在1120℃/140 MPa条件下的蠕变性能,采用SEM、STEM/TEM以及EDS等方法分析了Ru对合金γ/γ′相组织、合金元素成分分配比、蠕变变形组织和位错形态的影响。结果表明,与无Ru合金相比,含Ru合金γ′尺寸更为细小,γ相通道更窄,γ/γ′两相中对TCP相析出有重要影响的Re、Mo和Cr元素分配更加均匀。Ru通过减小γ′相尺寸和γ相通道宽度,降低γ/γ′界面平均位错间距,抑制蠕变加载过程中TCP相析出,显著提高合金的高温蠕变性能。
The creep properties of high RE nickel single crystal superalloy with different content of Ru (mass fraction, 0% and 2%) at 1120 ℃ / 140 MPa were studied. The effects of Ru Effect of γ / γ ’phase structure, alloying element composition distribution ratio, creep deformation structure and dislocation morphology. The results show that the γ ’size of the Ru-containing alloy is much smaller and the γ-phase channel is narrower than that of the Ru-free alloy. The distribution of Re, Mo and Cr in the γ / γ’ phase has an important effect on the precipitation of TCP phase. . By decreasing the size of γ ’phase and the width of γ phase, Ru can reduce the average dislocation distance at γ / γ’ interface and inhibit the precipitation of TCP phase during creep loading, which significantly improves the high temperature creep properties of alloy.