高熵合金跨尺度异构强韧化及其力学性能研究进展

安子冰, 毛圣成, 张泽, 韩晓东

Strengthening-Toughening Mechanism and Mechanical Properties of Span-Scale Heterostructure High-Entropy Alloy

AN Zibing, MAO Shengcheng, ZHANG Ze, HAN Xiaodong

图10 Fe₂₀Co₂₀Ni₄₁Al₁₉高熵合金鱼骨状显微结构^[35]

Fig.10 Hierarchically arranged herringbone microstructure of Fe₂₀Co₂₀Ni₄₁Al₁₉high entropy alloy^[35]
(a-c) conventionally cast eutectic high-entropy alloy (EHEA) serving here as reference material
(a) SEM backscattered electron image
(b) electron backscattering diffraction (EBSD) phase map (left) and IPF map (right)
(c) schematic diagram
(d-i) directionally solidified EHEA with a hierarchical herringbone microstructure (The black arrows in Figs.10d and e indicate the directional solidification (DS) direction; AEC—aligned eutectic colonies, BEC—branched eutectic colonies)
(d) SEM backscatter electron image showing that the microstructure is composed of columnar grains. Grain boundaries are marked by black dashed lines
(e) enlarged EBSD phase and IPF maps showing the columnar grain consisting of AEC and BEC. Black solid and dashed lines mark grain and colony boundaries, respectively
(f, i) schematic diagram of herringbone structure and its formation principle, respectively
(g) HAADF-STEM image and related SAED patterns of B2 and L1₂ phases. The HAADF-STEM image shows clean dual-phase lamellae without evidence of nanoprecipitates or other phases, as is also indicated in Fig.10f
(h) synchrotron high-energy X-ray diffraction (SHE-XRD) of B2 and L1₂ phases