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Rare Metals

, Volume 35, Issue 2, pp 127–139 | Cite as

An overview of rhenium effect in single-crystal superalloys

  • Ming Huang
  • Jing ZhuEmail author
Article

Abstract

Nickel-based single-crystal superalloys are the key materials for the manufacturing and development of advanced aeroengines. Rhenium is a crucial alloying element in the advanced nickel-based single-crystal superalloys for its special strengthening effects. The addition of Re could effectively enhance the creep properties of the single-crystal superalloys; thus, the content of Re is considered as one of the characteristics in different-generation single-crystal superalloys. Owing to the fundamental importance of rhenium to nickel-based single-crystal superalloys, much progress has been made on understanding of the effect of rhenium in the single-crystal superalloys. While the effect of Re doping on the nickel-based superalloys is well documented, the origins of the so-called rhenium effect are still under debate. In this paper, the effect of Re doping on the single-crystal superalloys and progress in understanding the rhenium effect are reviewed. The characteristics of the d-states occupancy in the electronic structure of Re make it the slowest diffusion elements in the single-crystal superalloys, which is undoubtedly responsible for the rhenium effect, while the postulates of Re cluster and the enrichment of Re at the γ/γ′ interface are still under debate, and the synergistic action of Re with other alloying elements should be further studied. Additionally, the interaction of Re with interfacial dislocations seems to be a promising explanation for the rhenium effect. Finally, the addition of Ru could help suppress topologically close-packed (TCP) phase formation and strengthen the Re doping single-crystal superalloys. Understanding the mechanism of rhenium effect will be beneficial for the effective utilization of Re and the design of low-cost single-crystal superalloys.

Keywords

Nickel-based single-crystal superalloys Rhenium effect Creep Strengthening mechanism Re cluster Interfacial dislocations 

Notes

Acknowledgments

This work was financially supported by the National Basic Research Program of China (No. 2009CB623701) and the National Natural Science Foundation of China (Nos. 11374174, 50971075 and 51390471).

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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Beijing National Center for Electron Microscopy, School of Materials Science and EngineeringTsinghua UniversityBeijingChina
  2. 2.The State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and EngineeringTsinghua UniversityBeijingChina
  3. 3.Laboratory of Advanced Materials (MOE), School of Materials Science and EngineeringTsinghua UniversityBeijingChina

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