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通过对 [0 0 1 ]取向单晶镍基合金蠕变曲线和位错运动内摩擦力的测定及能谱微区成分分析 ,研究了两种合金的蠕变特性。结果表明 :在 1 0 0 0℃和 1 2 0MPa条件下 ,两合金位错运动的内摩擦力值相近 ,随温度的升高 ,两合金的内摩擦力差值增大 ;随着温度的提高 ,不含Ta的合金中γ′相尺寸和体积分数明显减少 ,而Al和Ta元素含量较高的合金中 ,γ′相保持较高的体积分数是合金蠕变抗力明显提高的主要原因。
The creep characteristics of the [0 0 1] -oriented monocrystalline Ni-based alloys and the analysis of the internal friction of the dislocation motions and the energy spectrum micro-composition analysis were studied. The results show that the internal friction values of dislocation motion of both alloys are similar at 1 000 ℃ and 120MPa, and the difference of internal friction increases with the increase of temperature. With the increase of temperature In the alloys without Ta, the size and volume fraction of γ ’phase decrease obviously. However, keeping the γ’ phase volume fraction higher in alloys with higher Al and Ta content is the main reason for the significant improvement of creep resistance.