High-entropy alloys due to their tunable properties, superior corrosion resistance, and exceptional strength can be used as potential reinforcements in composites. In the present study, FeCoNiMnCr HEA sub-micron particles were used as fillers in the epoxy matrix to fabricate epoxy-HEA composites. These novel composite combinations were studied for their density, water absorption, microhardness and tensile properties. Metal powders of Fe, Co, Ni, Mn and Cr were mechanically alloyed in an equi-atomic ratio for 15 h to produce face-centred cubic (FCC) structured HEA particulates. The epoxy-HEA composites of different HEA concentrations (0, 1, 2, 3 and 4 HEA wt. %) were prepared using hand lay-up process. The fabricated composites had good structural integrity with void content below 3%. The electron microscopy images showed sub-micron HEA particles homogenously dispersed in the epoxy matrix. Epoxy composite with 4 wt% HEA filler concentration showed an absorption rate of 0.86% for 192-h immersion. The composites showed improved mechanical properties as compared to neat epoxy. For the addition of 4 wt% HEA filler, the microhardness and tensile strength of the epoxy composite improved by 158% and 54%, respectively.

中文翻译：

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FeCoNiMnCr高熵合金颗粒填料对环氧复合材料形貌和力学行为的影响

高熵合金由于其可调特性、优异的耐腐蚀性和卓越的强度，可用作复合材料中的潜在增强材料。在本研究中，FeCoNiMnCr HEA 亚微米颗粒被用作环氧树脂基体中的填料来制造环氧树脂-HEA 复合材料。研究了这些新型复合材料组合的密度、吸水率、显微硬度和拉伸性能。将 Fe、Co、Ni、Mn 和 Cr 的金属粉末以等原子比机械合金化 15 小时，产生面心立方 (FCC) 结构的 HEA 颗粒。采用手糊工艺制备了不同 HEA 浓度（0、1、2、3 和 4 HEA wt.%）的环氧-HEA 复合材料。所制备的复合材料具有良好的结构完整性，空隙率低于3%。电子显微镜图像显示亚微米 HEA 颗粒均匀分散在环氧树脂基质中。具有 4 wt% HEA 填料浓度的环氧复合材料在 192 小时的浸泡中显示出 0.86% 的吸收率。与纯环氧树脂相比，该复合材料显示出改进的机械性能。添加 4 wt% HEA 填料后，环氧复合材料的显微硬度和拉伸强度分别提高了 158% 和 54%。