共晶高熵合金十年发展回顾(2014—2024)：设计、制备与应用

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WANG Zhijun, BAI Xiaoyu, WANG Jianbin, JIANG Hui, JIAO Wenna, LI Tianxin, LU Yiping

图4 多种工艺调控下的共晶高熵合金微观组织[48,50~54]

Fig.4 Microstructures of EHEAs tailored by various processing methods (a) BSE image, EBSD phase, and Inverse pole figures (IPFs) of the directionally solidified Al19Fe20Co20Ni41 EHEA, showing a herringbone-like eutectic microstructure (BEC—branched eutectic colonies, AEC—aligned eutectic colonies)[48] (b) EBSD IPF map of as-printed AlCoCrFeNi2.1 EHEA, showing ultrafine nanolamellar eutectic colonies with different crystallographic orientations (Inset shows the EBSD phase map)[50] (c) EBSD phase map of the anomalous eutectic structure in remelted additive manufactured Ni32Co30Cr10Fe10Al18 EHEA[51] (d) EBSD phase map of equiaxed ultrafine-grained structure in the 90% cold-rolled AlCoCrFeNi2.1 EHEA after isothermal annealing[53] (e) SEM image and EBSD phase map of the AlCoCrFeNi2.1 EHEA cold-rolled by 84%-86% followed by non-isothermally annealing, showing heterogeneous duplex microstructure consisting of lamellar and ultrafine-grained structure[52] (f) IPFs of the phase-selectively recrystallized Ni30Co30Cr10Fe10Al18W2 EHEA, showing the microstructure with a fully recrystallized fcc phase embedded in the skeleton of a B2 phase[54]