为了提高镍基单晶高温合金的高温强度和其他综合性能,第四代合金中加入了铂族元素Ru。Ru的加入降低了γ相的堆垛层错能,减少了γ＇相的体积分数。作为一种有效的固溶强化元素,Ru对γ相和γ＇相的强化均起到了很显著的作用,提高了合金的蠕变性能,同时Ru也影响了难熔元素在合金中的偏析行为,降低了难熔元素在γ相中的过饱和度,并能抑制TCP相等有害相的析出,显著提高了合金的抗蠕变性能和合金显微组织的稳定性。综合分析了Ru的加入对镍基单晶高温合金微观组织结构的影响。
Addition of Ru in Ni-base single crystal superalloys had been used to improve the elevated temperature strength and other properties.Significant decreases in stacking fault energy of the γ phase and the volume fraction of γ′ phase were observed with the addition of Ru in the superalloys.As well as serving as an effective solid-solution strengthening element in Ni-base single crystal superalloys,Ru-addition was able to effectively strengthen both the γ and γ′ phases and suppress the formation of TCP phases.Due to the changes in partitioning behavior of elements and the slight decrease in supersaturation of refractory elements in γ phase with addition of Ru,the creep resistance and microstructural stability of the alloy were improved remarkably.The influence of Ru on microstructure of Ni-base single crystal superalloys was reviewed.
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