Precipitation-strengthening in High Entropy Alloys: a Review
BAI Xi1, FANG Wei1,2,*, CHANG Ruobin1, YU Haoyang1, YAN Jiaohui1, YIN Fuxing1,2,*
1 Key Research Institute for Energy Equipment Materials, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300132, China 2 Key Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Tianjin 300132, China
Abstract: High entropy alloys (HEAs), as multiple principal element alloys, represent a new field of metallurgy, which has attracted extensive attention due to their unique microstructure and properties. Precipitation strengthening has been proved to be a very effective method to improve the yield strength of HEAs. The coherent interface between the precipitates and the matrix is important in achieving a good combination of strength and ductility. Controlling the type, shape, size and volume fraction of the precipitates is the key factor to improve the strength and ductility of HEAs. It is proved that different heat treatment processes such as rolling, annealing and aging could regulate the matrix microstructure and characteristics of precipitates. Although precipitation-hardened high entropy alloys exhibit excellent tensile properties and thermal stability, their fatigue, creep, oxidation behaviors and related mechanisms are still unclear. Therefore, comprehensive evaluation of materials should be carried out to promote the rational design and manufacture of high-temperature devices with excellent performance. In order to predict and control the evolution process of the precipitates and design the alloy composition system reasonably, an in-depth and quantitative study on the intrinsic properties of the precipitates, such as element distribution, electronic structure and bonding state, is supposed to be carried out by means of calculation and simulation. This paper reviews the progress in phase formation, properties, thermal stability, calculation and simulation of precipitation-hardened HEAs, and summarizes the correlative problems, which is helpful and instructive to design precipitation-hardened HEAs in the future.
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