Abstract
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.
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