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通过研究含铼镍基单晶合金主要合金化元素Ｗ，Ｒｅ，Ｔａ，Ａｌ，ＲＥ等含量变化对其高温（９８０～１１００℃）持久性能和持久断裂特征的影响，探索优化合金元素配比的基本原理，并分析其对持久断裂行为的影响。结果发现：适当提高Ｒｅ，Ｗ，Ｎｂ，Ｔａ，Ａｌ含量有利于高温持久性能改善，这些元素间存在互相抵消或补偿的效用，必须进行各元素含量匹配才能综合优化。适量添加稀土对改善合金持久蠕变的性能效果独特，从而证明利用其它合金元素部分代替铼的合理性。初步分析表明：以上效用归因于元素对合金相强化、相体积含量以及对持久蠕变动力学特别是γ′相熟化综合作用的结果。本文初步设计出含铼小于２．０ｗｔ％低成本第二代单晶合金
The effects of W, Re, Ta, Al and RE contents on the ductility and long-term rupture characteristics at high temperature (980 ~ 1100 ℃) of the alloying elements in rhenium-nickel based single crystal alloys were investigated. Basic principle, and analyze its effect on lasting fracture behavior. The results show that proper increase of Re, W, Nb, Ta, Al content is beneficial to the improvement of long-term high temperature performance. These elements have the effect of offsetting or compensating each other, and the content of each element must be matched so as to be comprehensively optimized. Appropriate amount of added rare earth to improve the long-term creep performance of the alloy is unique, thus demonstrating the use of other alloying elements instead of the rationality of rhenium. The preliminary analysis shows that the above utility is attributed to the combination of elemental strengthening of the alloy phase, phase volume content, and the effect on the long-term creep kinetics, especially the γ ’phase maturation. In this paper, the second generation of single crystal alloys with rhenium less than 2.0wt% and low cost were designed