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Overview of the Development of L12 γ′-Strengthened Cobalt-Base Superalloys

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Advanced Multicomponent Alloys

Part of the book series: Materials Horizons: From Nature to Nanomaterials ((MHFNN))

Abstract

High-temperature technology is of major importance in many industrial applications, such as aircraft engines and land-based power generation gas turbines. Demands for high fuel and engine efficiency require the increasing service temperature of superalloys. The further development of widely used Ni-base superalloys hits a bottleneck due to the limitation of the melting point of Ni. In 2006, the discovery of γ/γ′ Co–Al–W alloys began a new era in the development history of high-temperature materials. Compared with Ni-base superalloys, the higher melting temperature by 50~150 °C, the greater creep resistance, and the comparative mechanical properties spotlight the research of novel γ/γ′ Co–Al–W-based alloys as one of the candidates for high-temperature materials for future generations of advanced propulsion systems. Despite the extraordinary improvement achieved in the various aspects of novel γ/γ′ Co–Al–W-based superalloys, several drawbacks still restrict the wide applications, such as metastable nature of γ′ precipitates, narrow γ/γ′ composition range, overhigh mass density, inferior medium–low-temperature strength. In this chapter, we review the current exploration of γ′-strengthened Co-base superalloys in view of these drawbacks, including phase stability of γ′ precipitates, γ′-solvus temperature, development of low-density γ/γ′ Co-base superalloys and CoNi-base superalloys, and high-temperature mechanical capability of γ/γ′ Co-base superalloys. Finally, the challenges and future research needs in the development of novel Co-base superalloys are prospected.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant No. 51601161) and Youth Innovation Fund Project of Xiamen (Grant No. 3502Z20206057), the Natural Science Foundation of Fujian Province of China (Grant No. 2020J01051).

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  1. School of Aerospace Engineering, Xiamen University, Xiamen, 361005, People’s Republic of China

    Wei-Wei Xu

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  1. Wei-Wei Xu
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Correspondence to Wei-Wei Xu .

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  1. Hong Kong Polytechnic University, Hong Kong, Hong Kong

    Zengbao Jiao

  2. City University of Hong Kong, Hong Kong, Hong Kong

    Tao Yang

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Xu, WW. (2022). Overview of the Development of L12 γ′-Strengthened Cobalt-Base Superalloys. In: Jiao, Z., Yang, T. (eds) Advanced Multicomponent Alloys. Materials Horizons: From Nature to Nanomaterials. Springer, Singapore. https://doi.org/10.1007/978-981-19-4743-8_7

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