FCC/L1<sub>2</sub>共格高熵高温合金的研究进展

doi:10.11896/cldb.20050264

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Abstract Superalloys are unique high-temperature materials widely used in the aerospace and energy industry. The performance of conventional supe-ralloys has been improved by alloying and advanced manufacturing processes during the past decades. However, operating temperatures are now reaching limits posed by the melting temperatures of these materials. Since 2004, a new alloy design and development philosophy—high-entropy alloys (HEAs), or multi-principle-element alloys (MPEAs)—has attracted significant attention. The four core effects of HEAs, including high configurational entropy, sluggish diffusion, severe lattice distortion, and cock-tail effect, are mainly responsible for the various physical and mechanical properties.
To develop higher performance of HEAs, precipitation strengthening has been widely applied in HEAs and is proved to be effective in strengthening or toughening. Based on the HEA concept and the coherent microstructure of FCC/L1₂, a series of high-entropy superalloys (HESAs) has been developed with high strength and long-time microstructural stabilities at high temperatures.
However, the work about phase formation of HESAs were few, and the mechanisms of strengthening and deformation still lacked systematic research. In addition, the surface stability of materials at elevated temperature is an important indicator in engineering applications, but there were few studies. Recently, researchers have developed a series of HESAs based on the empirical phase formation rules and computer simulation methods. The effects of morphology and stability for the L1₂ precipitated phase, the lattice mismatch, etc. on high-temperature performance, such as high strength and creep property were studied. Moreover, the surface stability of some HESAs were investigated in oxidizing and corrosive environments.
The present work summarizes the research progress of HESAs. The phase formation, mechanical properties, high temperature oxidation and corrosion are briefly reviewed. Finally, the future perspective of HESAs is prospected.

Key words： high-entropy superalloys FCC/L1₂ coherent precipitation high temperature creep antioxidant property high temperature corrosion

Published: 02 September 2020

CLC number:

TG132.3+2

Fund:National Natural Science Foundation of China (51822402,51671044), the National Key Research and Development Program of China (2019YFA0209901,2018YFA0702901), the fund of the State Key Laboratory of Solidification Processing in NWPU (SKLSP201902), the Liaoning Revitalization Talents Program (XLYC1807047), the National MCF Energy R & D Program (2018YFE0312400), and the National Construction of High-level University Public Graduate Project

About author:: Hongwei Yao received his master degree in Taiyuan University of Technology in 2017. He has been pursuing his Ph.D. degree at Dalian University of Technology under the supervision of Prof. Yiping Lu since 2017. Now he is a visiting Ph.D. student at Kyoto University in Japan. His research interests are alloy design, deformation mechanism and performance optimization of high-entropy alloys.
Yiping Lu received his B.S., and Ph.D. degrees in Northwestern Polytechnical University in 2002, and 2008, respectively. After two-year postdoctoral research at Dalian University of Technology, he is currently the full professor and the deputy dean of School of Mate-rials Science and Engineering at Dalian University of Technology. He is also the Youth Science and Technology Innovation Leader, the winner of Outstanding Youth Science Foundation, the winner of Liaoning Revitalization Talents, the Dalian Youth Science and Technology Star, etc. His research interests are composition design theory and industrial preparation technology of high-entropy alloys.

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	YAO Hongwei
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	CAO Zhiqiang
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Cite this article:

YAO Hongwei,LU Yiping,CAO Zhiqiang, et al. A Review on High-entropy Superalloys with FCC/L1₂ Structure[J]. Materials Reports, 2020, 34(17): 17041-17046.

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http://www.mater-rep.com/EN/10.11896/cldb.20050264 OR http://www.mater-rep.com/EN/Y2020/V34/I17/17041

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